{"id":16539,"date":"2026-09-13T21:52:33","date_gmt":"2026-09-13T18:52:33","guid":{"rendered":"https:\/\/www.ihs.com.tr\/blog\/?p=16539"},"modified":"2026-09-13T21:52:33","modified_gmt":"2026-09-13T18:52:33","slug":"galois-counter-mode-gcm-nedir","status":"publish","type":"post","link":"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/","title":{"rendered":"Galois\/Counter Mode (GCM) Nedir? Modern TLS Ba\u011flant\u0131lar\u0131nda Maksimum H\u0131z ve G\u00fcvenlik"},"content":{"rendered":"<p>\u0130nternet \u00fczerindeki dijital ileti\u015fimimizin temel ta\u015flar\u0131ndan olan g\u00fcvenlik ve h\u0131z, s\u00fcrekli geli\u015fen teknolojilerle yeni boyutlar kazan\u0131yor. Online bankac\u0131l\u0131ktan e-ticarete, anl\u0131k mesajla\u015fmadan bulut depolamaya kadar her alanda verilerimizi korumak i\u00e7in kulland\u0131\u011f\u0131m\u0131z \u015fifreleme y\u00f6ntemleri, bu geli\u015fimin merkezinde yer al\u0131yor. Galois\/Counter Mode (GCM), modern kriptografinin en parlak y\u0131ld\u0131zlar\u0131ndan biri olarak, hem veri gizlili\u011fini (\u015fifreleme) hem de veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc ve kimlik do\u011frulu\u011funu (authentication) tek bir pakette, \u00fcstelik bunu son derece y\u00fcksek bir performansla sunarak \u00f6ne \u00e7\u0131k\u0131yor. Bu makalede, GCM&#8217;nin ne oldu\u011funu, geleneksel \u015fifreleme modlar\u0131ndan neden daha \u00fcst\u00fcn oldu\u011funu ve modern TLS ba\u011flant\u0131lar\u0131n\u0131n vazge\u00e7ilmezi haline nas\u0131l geldi\u011fini derinlemesine inceleyece\u011fiz.<\/p>\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_77 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7erik Tablosu<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6aa85e056937f\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\" id=\"ez-toc-cssicon-toggle-item-6aa85e056937f\" aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Sifreleme-Modlarinin-Evrimi-ve-GCMin-Dogusu\" >\u015eifreleme Modlar\u0131n\u0131n Evrimi ve GCM&#8217;in Do\u011fu\u015fu<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Blok-Sifreleme-Temelleri-ve-Operasyon-Modlari\" >Blok \u015eifreleme Temelleri ve Operasyon Modlar\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Operasyon-Modu-Mode-of-Operation-Nedir-ve-Neden-Gereklidir\" >Operasyon Modu (Mode of Operation) Nedir ve Neden Gereklidir?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Geleneksel-Modlarin-CBC-gibi-Guvenlik-ve-Performans-Sinirliliklari\" >Geleneksel Modlar\u0131n (CBC gibi) G\u00fcvenlik ve Performans S\u0131n\u0131rl\u0131l\u0131klar\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Kimligi-Dogrulanmis-Sifreleme-AEAD-Ihtiyaci-ve-GCMin-Yukselisi\" >Kimli\u011fi Do\u011frulanm\u0131\u015f \u015eifreleme (AEAD) \u0130htiyac\u0131 ve GCM&#8217;in Y\u00fckseli\u015fi<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#GaloisCounter-Mode-GCM-Yapisi-ve-Temel-Bilesenleri\" >Galois\/Counter Mode (GCM) Yap\u0131s\u0131 ve Temel Bile\u015fenleri<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#GCM-Nedir-Butunlesik-Bir-Guvenlik-Yaklasimi\" >GCM Nedir? B\u00fct\u00fcnle\u015fik Bir G\u00fcvenlik Yakla\u015f\u0131m\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Sifreleme-Bileseni-Counter-Mode-CTR-Nasil-Calisir\" >\u015eifreleme Bile\u015feni: Counter Mode (CTR) Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Kimlik-Dogrulama-Bileseni-Galois-Message-Authentication-Code-GMAC\" >Kimlik Do\u011frulama Bile\u015feni: Galois Message Authentication Code (GMAC)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Nonce-IV-Kullaniminin-Kritik-Onemi-ve-Benzersizlik-Sarti\" >Nonce (IV) Kullan\u0131m\u0131n\u0131n Kritik \u00d6nemi ve Benzersizlik \u015eart\u0131<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#GCMnin-Hiz-ve-Guvenligi-Nasil-Sagladigi-Teknik-Detaylar\" >GCM&#8217;nin H\u0131z ve G\u00fcvenli\u011fi Nas\u0131l Sa\u011flad\u0131\u011f\u0131: Teknik Detaylar<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Paralellestirme-Yetenegi-Sayesinde-Yuksek-Performans-ve-Hiz\" >Paralelle\u015ftirme Yetene\u011fi Sayesinde Y\u00fcksek Performans ve H\u0131z<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Butunluk-ve-Kimlik-Dogrulama-Veri-Manipulasyonuna-Karsi-Tam-Koruma\" >B\u00fct\u00fcnl\u00fck ve Kimlik Do\u011frulama: Veri Manip\u00fclasyonuna Kar\u015f\u0131 Tam Koruma<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Gizlilik-Veri-Sizintilarina-Karsi-Guclu-Sifreleme\" >Gizlilik: Veri S\u0131z\u0131nt\u0131lar\u0131na Kar\u015f\u0131 G\u00fc\u00e7l\u00fc \u015eifreleme<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Dusuk-Gecikme-Low-Latency-ve-Donanim-Hizlandirma-Destegi\" >D\u00fc\u015f\u00fck Gecikme (Low Latency) ve Donan\u0131m H\u0131zland\u0131rma Deste\u011fi<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Modern-TLS-Baglantilarinda-GCMnin-Stratejik-Rolu\" >Modern TLS Ba\u011flant\u0131lar\u0131nda GCM&#8217;nin Stratejik Rol\u00fc<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#TLS-El-Sikismasi-Handshake-ve-Sifre-Paketi-Cipher-Suite-Secimi\" >TLS El S\u0131k\u0131\u015fmas\u0131 (Handshake) ve \u015eifre Paketi (Cipher Suite) Se\u00e7imi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#GCM-Tabanli-Sifre-Paketleri-Orn-TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256\" >GCM Tabanl\u0131 \u015eifre Paketleri (\u00d6rn: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Neden-Modern-Web-Sunuculari-ve-Tarayicilar-GCMi-Varsayilan-Olarak-Tercih-Ediyor\" >Neden Modern Web Sunucular\u0131 ve Taray\u0131c\u0131lar GCM&#8217;i Varsay\u0131lan Olarak Tercih Ediyor?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Perfect-Forward-Secrecy-PFS-ile-GCM-Iliskisi\" >Perfect Forward Secrecy (PFS) ile GCM \u0130li\u015fkisi<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#GCM-ve-Diger-Sifreleme-Modlarinin-Karsilastirmasi\" >GCM ve Di\u011fer \u015eifreleme Modlar\u0131n\u0131n Kar\u015f\u0131la\u015ft\u0131rmas\u0131<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#GCM-vs-CBC-Cipher-Block-Chaining-Guvenlik-Farkliliklari\" >GCM vs. CBC (Cipher Block Chaining): G\u00fcvenlik Farkl\u0131l\u0131klar\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Performans-Karsilastirmasi-Islem-Hizi-ve-Kaynak-Kullanimi\" >Performans Kar\u015f\u0131la\u015ft\u0131rmas\u0131: \u0130\u015flem H\u0131z\u0131 ve Kaynak Kullan\u0131m\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#CBC-Modundaki-Zafiyetler-Padding-Oracle-Saldirilari-ve-GCMin-Cozumu\" >CBC Modundaki Zafiyetler: Padding Oracle Sald\u0131r\u0131lar\u0131 ve GCM&#8217;in \u00c7\u00f6z\u00fcm\u00fc<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#GCM-Uygulamalarinda-Dikkat-Edilmesi-Gereken-Guvenlik-Hususlari\" >GCM Uygulamalar\u0131nda Dikkat Edilmesi Gereken G\u00fcvenlik Hususlar\u0131<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Nonce-Baslatma-Vektoru-Tekrar-Kullanim-Riski-ve-Felaketle-Sonuclanabilen-Etkileri\" >Nonce (Ba\u015flatma Vekt\u00f6r\u00fc) Tekrar Kullan\u0131m Riski ve Felaketle Sonu\u00e7lanabilen Etkileri<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Zayif-Kriptografik-Kutuphanelerin-Kullanimindan-Kacinma\" >Zay\u0131f Kriptografik K\u00fct\u00fcphanelerin Kullan\u0131m\u0131ndan Ka\u00e7\u0131nma<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Dogru-Anahtar-Yonetiminin-ve-Anahtar-Boyutunun-Onemi\" >Do\u011fru Anahtar Y\u00f6netiminin ve Anahtar Boyutunun \u00d6nemi<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Guvenli-ve-Hizli-TLS-Baglantilari-Icin-Neden-IHS-Telekomu-Tercih-Etmelisiniz\" >G\u00fcvenli ve H\u0131zl\u0131 TLS Ba\u011flant\u0131lar\u0131 \u0130\u00e7in Neden \u0130HS Telekom&#8217;u Tercih Etmelisiniz?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#En-Guncel-ve-Guclu-GCM-Sifre-Paketlerini-Destekleyen-SSL-Sertifikalari\" >En G\u00fcncel ve G\u00fc\u00e7l\u00fc GCM \u015eifre Paketlerini Destekleyen SSL Sertifikalar\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Uzman-Teknik-Destek-ile-Dogru-TLS-Yapilandirmasi-Danismanligi\" >Uzman Teknik Destek ile Do\u011fru TLS Yap\u0131land\u0131rmas\u0131 Dan\u0131\u015fmanl\u0131\u011f\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Yuksek-Performansli-Altyapi-ile-Maksimum-Baglanti-Hizi-ve-Guvenligi\" >Y\u00fcksek Performansl\u0131 Altyap\u0131 ile Maksimum Ba\u011flant\u0131 H\u0131z\u0131 ve G\u00fcvenli\u011fi<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/www.ihs.com.tr\/blog\/galois-counter-mode-gcm-nedir\/#Otomatik-Kurulum-Yonetim-Kolayligi-ve-Uygun-Fiyatli-Cozumler\" >Otomatik Kurulum, Y\u00f6netim Kolayl\u0131\u011f\u0131 ve Uygun Fiyatl\u0131 \u00c7\u00f6z\u00fcmler<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"Sifreleme-Modlarinin-Evrimi-ve-GCMin-Dogusu\"><\/span>\u015eifreleme Modlar\u0131n\u0131n Evrimi ve GCM&#8217;in Do\u011fu\u015fu<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Modern kriptografinin temelini olu\u015fturan blok \u015fifreleme algoritmalar\u0131, tek ba\u015flar\u0131na b\u00fcy\u00fck veri setlerini g\u00fcvenli bir \u015fekilde i\u015flemek i\u00e7in yeterli de\u011fildir. Bu noktada devreye giren operasyon modlar\u0131, \u015fifrelemenin hem g\u00fcvenli\u011fini hem de verimlili\u011fini belirleyen kritik bir rol oynar. GCM&#8217;in neden bu kadar \u00f6nemli oldu\u011funu anlamak i\u00e7in, \u00f6ncelikle bu modlar\u0131n evrimini ve geleneksel yakla\u015f\u0131mlar\u0131n getirdi\u011fi s\u0131n\u0131rl\u0131l\u0131klar\u0131 kavramak gerekir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Blok-Sifreleme-Temelleri-ve-Operasyon-Modlari\"><\/span>Blok \u015eifreleme Temelleri ve Operasyon Modlar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Blok \u015fifreleme, veriyi sabit boyutlu bloklara (\u00f6rne\u011fin, AES i\u00e7in 128-bit) ay\u0131rarak \u00e7al\u0131\u015fan bir \u015fifreleme y\u00f6ntemidir. Her bir blo\u011fu belirledi\u011finiz bir anahtar kullanarak \u015fifreler. Ancak, e-postalar, dosyalar veya web sayfalar\u0131 gibi veriler genellikle tek bir bloktan \u00e7ok daha b\u00fcy\u00fckt\u00fcr. E\u011fer her blok ayn\u0131 anahtarla ba\u011f\u0131ms\u0131z olarak \u015fifrelenirse (ECB modu gibi en basit modda), veri i\u00e7indeki desenler \u015fifreli metne yans\u0131r ve bu da ciddi bir g\u00fcvenlik a\u00e7\u0131\u011f\u0131 olu\u015fturur. \u0130\u015fte bu sorunu \u00e7\u00f6zmek i\u00e7in operasyon modlar\u0131 geli\u015ftirilmi\u015ftir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Operasyon-Modu-Mode-of-Operation-Nedir-ve-Neden-Gereklidir\"><\/span>Operasyon Modu (Mode of Operation) Nedir ve Neden Gereklidir?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Operasyon modu, bir blok \u015fifreleme algoritmas\u0131n\u0131n b\u00fcy\u00fck boyutlu verileri g\u00fcvenli bir \u015fekilde nas\u0131l i\u015fleyece\u011fini tan\u0131mlayan bir protokold\u00fcr. Bu modlar, bloklar aras\u0131nda matematiksel ili\u015fkiler kurarak (\u00f6rne\u011fin bir \u00f6nceki blo\u011fun \u015fifreli \u00e7\u0131kt\u0131s\u0131n\u0131 bir sonraki blo\u011fun \u015fifrelenmesine dahil ederek) basit \u015fifrelemedeki desen tekrar\u0131 sorununu ortadan kald\u0131r\u0131r. Cipher Block Chaining (CBC), Counter (CTR), ve Galois\/Counter Mode (GCM) gibi modlar, farkl\u0131 g\u00fcvenlik ve performans \u00f6zellikleriyle bu ihtiyaca cevap verir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Geleneksel-Modlarin-CBC-gibi-Guvenlik-ve-Performans-Sinirliliklari\"><\/span>Geleneksel Modlar\u0131n (CBC gibi) G\u00fcvenlik ve Performans S\u0131n\u0131rl\u0131l\u0131klar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Uzun y\u0131llar boyunca standart olarak kabul edilen CBC (Cipher Block Chaining) modu, her blo\u011fun \u015fifrelenmeden \u00f6nce bir \u00f6nceki \u015fifreli blok ile XOR i\u015flemine tabi tutulmas\u0131 prensibine dayan\u0131r. Bu zincirleme yap\u0131, desen tekrar\u0131n\u0131 engellemede ba\u015far\u0131l\u0131 olsa da \u00f6nemli bir performans dezavantaj\u0131 yarat\u0131r: \u015fifreleme i\u015flemi do\u011fas\u0131 gere\u011fi s\u0131ral\u0131d\u0131r ve paralelle\u015ftirilemez. Yani, bir blo\u011fu \u015fifrelemek i\u00e7in bir \u00f6ncekinin bitmesini beklemek zorundas\u0131n\u0131z. Bu durum, \u00e7ok \u00e7ekirdekli modern i\u015flemcilerin g\u00fcc\u00fcnden tam olarak faydalanmay\u0131 engeller ve y\u00fcksek h\u0131zl\u0131 a\u011f ba\u011flant\u0131lar\u0131nda bir darbo\u011faz olu\u015fturur. Ayr\u0131ca, CBC modu padding (dolgu) gerektirdi\u011fi i\u00e7in &#8220;Padding Oracle&#8221; gibi zafiyetlere kar\u015f\u0131 savunmas\u0131zd\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Kimligi-Dogrulanmis-Sifreleme-AEAD-Ihtiyaci-ve-GCMin-Yukselisi\"><\/span>Kimli\u011fi Do\u011frulanm\u0131\u015f \u015eifreleme (AEAD) \u0130htiyac\u0131 ve GCM&#8217;in Y\u00fckseli\u015fi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Geleneksel \u015fifreleme modlar\u0131 yaln\u0131zca veri gizlili\u011fini (confidentiality) sa\u011flar. Yani, veriyi yetkisiz ki\u015filerin okumas\u0131n\u0131 engeller. Ancak modern g\u00fcvenlik anlay\u0131\u015f\u0131nda iki kritik ihtiya\u00e7 daha vard\u0131r: b\u00fct\u00fcnl\u00fck (integrity) ve kimlik do\u011frulama (authenticity). B\u00fct\u00fcnl\u00fck, verinin transfer s\u0131ras\u0131nda de\u011fi\u015ftirilmedi\u011fini, kimlik do\u011frulama ise verinin ger\u00e7ekten beklenen kaynaktan geldi\u011fini garanti eder. Eskiden bu, \u015fifrelemeye ek olarak HMAC gibi ayr\u0131 bir Mesaj Do\u011frulama Kodu (MAC) algoritmas\u0131 kullan\u0131larak yap\u0131l\u0131rd\u0131. Ancak bu iki ayr\u0131 i\u015flemi do\u011fru bir \u015fekilde birle\u015ftirmek zordur ve uygulama hatalar\u0131na a\u00e7\u0131kt\u0131r. \u0130\u015fte bu noktada <b>Kimli\u011fi Do\u011frulanm\u0131\u015f \u015eifreleme (Authenticated Encryption with Associated Data &#8211; AEAD)<\/b> kavram\u0131 do\u011fdu. GCM, AEAD&#8217;\u0131 yerel olarak, tek ve verimli bir operasyonda sunan ilk pop\u00fcler modlardan biridir. Bu b\u00fct\u00fcnle\u015fik yakla\u015f\u0131m\u0131 sayesinde hem daha g\u00fcvenli hem de daha h\u0131zl\u0131d\u0131r, bu da onun modern kriptografideki y\u00fckseli\u015finin temel nedenidir.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"GaloisCounter-Mode-GCM-Yapisi-ve-Temel-Bilesenleri\"><\/span>Galois\/Counter Mode (GCM) Yap\u0131s\u0131 ve Temel Bile\u015fenleri<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>GCM, ad\u0131ndan da anla\u015f\u0131laca\u011f\u0131 gibi iki temel kriptografik tekni\u011fi bir araya getirerek hem y\u00fcksek h\u0131z hem de b\u00fct\u00fcnle\u015fik g\u00fcvenlik sunan bir operasyon modudur. \u015eifreleme i\u00e7in Counter (CTR) modunun h\u0131z ve paralelle\u015ftirme avantajlar\u0131n\u0131 kullan\u0131rken, kimlik do\u011frulama i\u00e7in Galois Alan\u0131 matemati\u011fine dayal\u0131 g\u00fc\u00e7l\u00fc bir y\u00f6ntem olan GMAC&#8217;i entegre eder. Bu ikili yap\u0131, GCM&#8217;i modern g\u00fcvenlik uygulamalar\u0131 i\u00e7in ideal bir \u00e7\u00f6z\u00fcm haline getirir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"GCM-Nedir-Butunlesik-Bir-Guvenlik-Yaklasimi\"><\/span>GCM Nedir? B\u00fct\u00fcnle\u015fik Bir G\u00fcvenlik Yakla\u015f\u0131m\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Galois\/Counter Mode (GCM), bir AEAD (Kimli\u011fi Do\u011frulanm\u0131\u015f \u015eifreleme) modudur. Bu, tek bir operasyonla veriyi hem \u015fifreleyebilece\u011fi (gizlili\u011fi sa\u011flama) hem de verinin b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc ve kayna\u011f\u0131n\u0131n do\u011frulu\u011funu teyit eden bir kimlik do\u011frulama etiketi (authentication tag) \u00fcretebilece\u011fi anlam\u0131na gelir. Bu b\u00fct\u00fcnle\u015fik yap\u0131, &#8220;\u00f6nce \u015fifrele sonra do\u011frula&#8221; gibi ayr\u0131 ad\u0131mlar\u0131 ortadan kald\u0131rarak hem implementasyon karma\u015f\u0131kl\u0131\u011f\u0131n\u0131 azalt\u0131r hem de potansiyel g\u00fcvenlik a\u00e7\u0131klar\u0131n\u0131n \u00f6n\u00fcne ge\u00e7er.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Sifreleme-Bileseni-Counter-Mode-CTR-Nasil-Calisir\"><\/span>\u015eifreleme Bile\u015feni: Counter Mode (CTR) Nas\u0131l \u00c7al\u0131\u015f\u0131r?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM&#8217;nin \u015fifreleme omurgas\u0131n\u0131 Counter (CTR) modu olu\u015fturur. CTR modu, geleneksel blok zincirleme modlar\u0131ndan (CBC gibi) farkl\u0131 \u00e7al\u0131\u015f\u0131r. Veri bloklar\u0131n\u0131 do\u011frudan \u015fifrelemek yerine, &#8220;nonce&#8221; (tek kullan\u0131ml\u0131k bir say\u0131) ve bir saya\u00e7tan olu\u015fan bir de\u011feri \u015fifreler. Bu \u015fifrelenmi\u015f saya\u00e7 \u00e7\u0131kt\u0131s\u0131, daha sonra as\u0131l veri blo\u011fu (plaintext) ile XOR i\u015flemine tabi tutularak \u015fifreli metin (ciphertext) elde edilir. CTR modunun en b\u00fcy\u00fck avantaj\u0131, her blo\u011fun \u015fifrelenmesinin di\u011ferlerinden tamamen ba\u011f\u0131ms\u0131z olmas\u0131d\u0131r. Bu sayede \u015fifreleme i\u015flemi tamamen paralelle\u015ftirilebilir, bu da \u00e7ok \u00e7ekirdekli i\u015flemcilerde ve \u00f6zel donan\u0131mlarda muazzam bir h\u0131z art\u0131\u015f\u0131 sa\u011flar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Kimlik-Dogrulama-Bileseni-Galois-Message-Authentication-Code-GMAC\"><\/span>Kimlik Do\u011frulama Bile\u015feni: Galois Message Authentication Code (GMAC)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM&#8217;nin kimlik do\u011frulama k\u0131sm\u0131n\u0131 GMAC \u00fcstlenir. GMAC, \u015fifrelenmi\u015f verinin (ciphertext) ve iste\u011fe ba\u011fl\u0131 olarak \u015fifrelenmemi\u015f &#8220;Ek Do\u011frulanm\u0131\u015f Veri&#8221;nin (Associated Data &#8211; AD) b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc garanti alt\u0131na alan bir mesaj kimlik do\u011frulama kodudur. \u00d6rne\u011fin, bir a\u011f paketinde IP ba\u015fl\u0131klar\u0131 gibi \u015fifrelenmemesi gereken ama de\u011fi\u015ftirilmemesi de kritik olan veriler AD olarak i\u015fleme dahil edilebilir. GMAC, bu veriler \u00fczerinde Galois Alan\u0131 (Galois Field &#8211; GF(2^128)) ad\u0131 verilen \u00f6zel bir matematiksel yap\u0131da \u00e7arpma ve toplama i\u015flemleri ger\u00e7ekle\u015ftirerek benzersiz bir kimlik do\u011frulama etiketi (authentication tag) olu\u015fturur. Veriyi alan taraf, ayn\u0131 i\u015flemi kendi taraf\u0131nda yapar ve olu\u015fturdu\u011fu etiket ile g\u00f6ndericinin g\u00f6nderdi\u011fi etiketi kar\u015f\u0131la\u015ft\u0131r\u0131r. Etiketler e\u015fle\u015firse, verinin transfer s\u0131ras\u0131nda de\u011fi\u015ftirilmedi\u011fi ve beklenen kaynaktan geldi\u011fi do\u011frulanm\u0131\u015f olur.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Nonce-IV-Kullaniminin-Kritik-Onemi-ve-Benzersizlik-Sarti\"><\/span>Nonce (IV) Kullan\u0131m\u0131n\u0131n Kritik \u00d6nemi ve Benzersizlik \u015eart\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM&#8217;nin g\u00fcvenli\u011fi, her \u015fifreleme i\u015flemi i\u00e7in kullan\u0131lan <b>Nonce<\/b> (Number used once) veya IV (Initialization Vector &#8211; Ba\u015flatma Vekt\u00f6r\u00fc) de\u011ferinin mutlak surette benzersiz olmas\u0131na dayan\u0131r. Ayn\u0131 anahtar ile iki farkl\u0131 veri par\u00e7as\u0131 ayn\u0131 Nonce de\u011feri kullan\u0131larak \u015fifrelenirse, GCM&#8217;nin temelini olu\u015fturan XOR denklemleri k\u0131r\u0131larak her iki mesaj\u0131n i\u00e7eri\u011fi de tamamen a\u00e7\u0131\u011fa \u00e7\u0131kar\u0131labilir. Bu, bir kriptografik sistem i\u00e7in &#8220;felaket&#8221; olarak nitelendirilen bir durumdur. Bu nedenle, GCM implementasyonlar\u0131nda Nonce&#8217;\u0131n her kullan\u0131mda (\u00f6rne\u011fin artan bir saya\u00e7 veya rastgele \u00fcretilmi\u015f y\u00fcksek entropili bir de\u011fer ile) kesinlikle tekrarlanmamas\u0131 kritik bir g\u00fcvenlik \u015fart\u0131d\u0131r.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"GCMnin-Hiz-ve-Guvenligi-Nasil-Sagladigi-Teknik-Detaylar\"><\/span>GCM&#8217;nin H\u0131z ve G\u00fcvenli\u011fi Nas\u0131l Sa\u011flad\u0131\u011f\u0131: Teknik Detaylar<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>GCM, modern kriptografinin &#8220;hem h\u0131zl\u0131 hem g\u00fcvenli&#8221; mottosunu en iyi \u015fekilde temsil eden modlardan biridir. Bu ba\u015far\u0131s\u0131n\u0131, ak\u0131ll\u0131ca tasarlanm\u0131\u015f mimarisi ve modern donan\u0131mlar\u0131n yeteneklerinden sonuna kadar faydalanmas\u0131na bor\u00e7ludur. GCM&#8217;nin bu \u00e7ifte avantaj\u0131 nas\u0131l sundu\u011funa teknik olarak daha yak\u0131ndan bakal\u0131m.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Paralellestirme-Yetenegi-Sayesinde-Yuksek-Performans-ve-Hiz\"><\/span>Paralelle\u015ftirme Yetene\u011fi Sayesinde Y\u00fcksek Performans ve H\u0131z<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM&#8217;nin y\u00fcksek performans\u0131n\u0131n ard\u0131ndaki en b\u00fcy\u00fck s\u0131r, \u015fifreleme i\u00e7in kulland\u0131\u011f\u0131 Counter (CTR) modunun yap\u0131s\u0131d\u0131r. CBC gibi geleneksel modlar\u0131n aksine, CTR modunda her veri blo\u011funun \u015fifrelenmesi bir \u00f6ncekinden tamamen ba\u011f\u0131ms\u0131zd\u0131r. Bu, 100 blokluk bir verinin 100 farkl\u0131 i\u015flemci \u00e7ekirde\u011finde ayn\u0131 anda \u015fifrelenebilece\u011fi anlam\u0131na gelir. Bu &#8220;paralelle\u015ftirme&#8221; yetene\u011fi, GCM&#8217;nin \u00e7ok \u00e7ekirdekli modern <a href=\"https:\/\/www.ihs.com.tr\/sunucu-kiralama\/\" target=\"_blank\">sunucu<\/a> i\u015flemcilerinde ve a\u011f cihazlar\u0131nda inan\u0131lmaz h\u0131zlara ula\u015fmas\u0131n\u0131 sa\u011flar. S\u0131ral\u0131 i\u015flem gerektiren modlar bu donan\u0131m g\u00fcc\u00fcnden tam olarak yararlanamazken, GCM \u00f6l\u00e7eklenebilir bir performans sunar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Butunluk-ve-Kimlik-Dogrulama-Veri-Manipulasyonuna-Karsi-Tam-Koruma\"><\/span>B\u00fct\u00fcnl\u00fck ve Kimlik Do\u011frulama: Veri Manip\u00fclasyonuna Kar\u015f\u0131 Tam Koruma<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>G\u00fcvenlik sadece gizlilikten ibaret de\u011fildir. Verinin yolda de\u011fi\u015ftirilmedi\u011finden emin olmak da en az o kadar \u00f6nemlidir. GCM&#8217;nin GMAC bile\u015feni, bu korumay\u0131 en \u00fcst d\u00fczeyde sa\u011flar. \u015eifrelenmi\u015f veri \u00fczerinden hesaplanan kimlik do\u011frulama etiketi (authentication tag), verinin tek bir bitinin bile de\u011fi\u015ftirilmesine kar\u015f\u0131 son derece hassast\u0131r. Bir sald\u0131rgan, \u015fifreli metin \u00fczerinde en ufak bir de\u011fi\u015fiklik yapsa bile, al\u0131c\u0131 tarafta hesaplanacak olan etiket orijinaliyle e\u015fle\u015fmeyecektir. Bu durumda sistem veriyi reddeder ve potansiyel bir sald\u0131r\u0131y\u0131 an\u0131nda engellemi\u015f olur. Bu, aktif sald\u0131r\u0131lara (man-in-the-middle gibi) kar\u015f\u0131 g\u00fc\u00e7l\u00fc bir savunma hatt\u0131 olu\u015fturur.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Gizlilik-Veri-Sizintilarina-Karsi-Guclu-Sifreleme\"><\/span>Gizlilik: Veri S\u0131z\u0131nt\u0131lar\u0131na Kar\u015f\u0131 G\u00fc\u00e7l\u00fc \u015eifreleme<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM, temel \u015fifreleme algoritmas\u0131 olarak genellikle AES (Advanced Encryption Standard) kullan\u0131r. CTR modunun bir ak\u0131\u015f \u015fifresi gibi davranmas\u0131, temelindeki blok \u015fifre (AES) ne kadar g\u00fc\u00e7l\u00fcyse, GCM&#8217;in de o kadar g\u00fc\u00e7l\u00fc bir gizlilik sa\u011flad\u0131\u011f\u0131 anlam\u0131na gelir. Do\u011fru bir \u015fekilde (\u00f6zellikle benzersiz Nonce kullan\u0131m\u0131yla) uyguland\u0131\u011f\u0131nda, AES-GCM, g\u00fcn\u00fcm\u00fcz\u00fcn en geli\u015fmi\u015f sald\u0131r\u0131lar\u0131na kar\u015f\u0131 bile verilerin gizlili\u011fini korumak i\u00e7in kan\u0131tlanm\u0131\u015f ve standartla\u015fm\u0131\u015f bir y\u00f6ntemdir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Dusuk-Gecikme-Low-Latency-ve-Donanim-Hizlandirma-Destegi\"><\/span>D\u00fc\u015f\u00fck Gecikme (Low Latency) ve Donan\u0131m H\u0131zland\u0131rma Deste\u011fi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM&#8217;nin tasar\u0131m\u0131, y\u00fcksek h\u0131zl\u0131 ve gecikmeye duyarl\u0131 uygulamalar i\u00e7in de optimize edilmi\u015ftir. \u015eifreleme ve kimlik do\u011frulama i\u015flemleri b\u00fcy\u00fck \u00f6l\u00e7\u00fcde birbirine paralel olarak y\u00fcr\u00fct\u00fclebilir (pipelining). Bu, verinin i\u015flenmeye ba\u015flamas\u0131yla tamamlanmas\u0131 aras\u0131ndaki s\u00fcreyi, yani gecikmeyi (latency) en aza indirir. Daha da \u00f6nemlisi, modern Intel ve AMD i\u015flemcileri, AES-GCM operasyonlar\u0131n\u0131 do\u011frudan donan\u0131m seviyesinde h\u0131zland\u0131ran \u00f6zel komut setlerine (AES-NI) sahiptir. Bu donan\u0131m deste\u011fi, yaz\u0131l\u0131m tabanl\u0131 \u015fifrelemeye k\u0131yasla performans\u0131 katbekat art\u0131r\u0131r ve CPU \u00fczerindeki y\u00fck\u00fc \u00f6nemli \u00f6l\u00e7\u00fcde azalt\u0131r. Bu da GCM&#8217;i y\u00fcksek trafikli web sunucular\u0131 ve a\u011f ge\u00e7itleri i\u00e7in m\u00fckemmel bir se\u00e7enek haline getirir.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Modern-TLS-Baglantilarinda-GCMnin-Stratejik-Rolu\"><\/span>Modern TLS Ba\u011flant\u0131lar\u0131nda GCM&#8217;nin Stratejik Rol\u00fc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Bug\u00fcn bir web sitesine girdi\u011finizde taray\u0131c\u0131n\u0131z\u0131n adres \u00e7ubu\u011funda g\u00f6rd\u00fc\u011f\u00fcn\u00fcz asma kilit simgesi, arkan\u0131zda \u00e7al\u0131\u015fan karma\u015f\u0131k bir g\u00fcvenlik protokol\u00fc olan TLS&#8217;in (Transport Layer Security) bir sonucudur. GCM, bu modern ve g\u00fcvenli ba\u011flant\u0131lar\u0131n merkezinde yer alarak hem verilerimizi korur hem de internet deneyimimizin h\u0131zl\u0131 ve ak\u0131c\u0131 olmas\u0131n\u0131 sa\u011flar. GCM&#8217;in bu stratejik rol\u00fc, TLS&#8217;in \u00e7al\u0131\u015fma bi\u00e7imiyle do\u011frudan ili\u015fkilidir.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"TLS-El-Sikismasi-Handshake-ve-Sifre-Paketi-Cipher-Suite-Secimi\"><\/span>TLS El S\u0131k\u0131\u015fmas\u0131 (Handshake) ve \u015eifre Paketi (Cipher Suite) Se\u00e7imi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bir taray\u0131c\u0131 bir web sunucusuna ba\u011fland\u0131\u011f\u0131nda, g\u00fcvenli ileti\u015fim ba\u015flamadan \u00f6nce &#8220;TLS el s\u0131k\u0131\u015fmas\u0131&#8221; (handshake) ad\u0131 verilen bir s\u00fcre\u00e7 ger\u00e7ekle\u015fir. Bu s\u00fcre\u00e7te taray\u0131c\u0131 ve sunucu, birbirlerine hangi kriptografik algoritmalar\u0131 desteklediklerini bildirirler. Anla\u015ft\u0131klar\u0131 algoritma setine &#8220;\u015fifre paketi&#8221; (cipher suite) denir. Bu paket; anahtar de\u011fi\u015fim algoritmas\u0131n\u0131, toplu \u015fifreleme algoritmas\u0131n\u0131, operasyon modunu ve mesaj do\u011frulama algoritmas\u0131n\u0131 tan\u0131mlar. GCM, bu paketin &#8220;operasyon modu&#8221; k\u0131sm\u0131nda yer al\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"GCM-Tabanli-Sifre-Paketleri-Orn-TLS-ECDHE-RSA-WITH-AES-128-GCM-SHA256\"><\/span>GCM Tabanl\u0131 \u015eifre Paketleri (\u00d6rn: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Modern TLS yap\u0131land\u0131rmalar\u0131nda en s\u0131k g\u00f6r\u00fclen \u015fifre paketleri GCM tabanl\u0131d\u0131r. \u00d6rne\u011fin, <b>TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256<\/b> gibi bir paketi inceleyelim:<\/p>\n<ul>\n<li><b>ECDHE:<\/b> Anahtar de\u011fi\u015fimi i\u00e7in Eliptik E\u011fri Diffie-Hellman (Ephemeral) kullan\u0131laca\u011f\u0131n\u0131 belirtir. Bu, Perfect Forward Secrecy sa\u011flar.<\/li>\n<li><b>RSA:<\/b> Sunucunun kimli\u011fini do\u011frulamak i\u00e7in RSA tabanl\u0131 bir sertifika kullan\u0131ld\u0131\u011f\u0131n\u0131 g\u00f6sterir.<\/li>\n<li><b>AES_128_GCM:<\/b> Toplu veri \u015fifrelemesi i\u00e7in 128-bit anahtarl\u0131 AES algoritmas\u0131n\u0131n, GCM operasyon modu ile birlikte kullan\u0131laca\u011f\u0131n\u0131 belirtir. \u0130\u015fte GCM&#8217;nin rol\u00fc tam olarak buradad\u0131r.<\/li>\n<li><b>SHA256:<\/b> El s\u0131k\u0131\u015fma mesajlar\u0131n\u0131n b\u00fct\u00fcnl\u00fc\u011f\u00fc i\u00e7in SHA256 hash fonksiyonunun kullan\u0131laca\u011f\u0131n\u0131 ifade eder.<\/li>\n<\/ul>\n<p>Bu paket, hem y\u00fcksek g\u00fcvenlik hem de y\u00fcksek performans sunan modern bir standartt\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Neden-Modern-Web-Sunuculari-ve-Tarayicilar-GCMi-Varsayilan-Olarak-Tercih-Ediyor\"><\/span>Neden Modern Web Sunucular\u0131 ve Taray\u0131c\u0131lar GCM&#8217;i Varsay\u0131lan Olarak Tercih Ediyor?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Web sunucular\u0131 (Apache, Nginx vb.) ve taray\u0131c\u0131lar (Chrome, Firefox vb.) GCM tabanl\u0131 \u015fifre paketlerini \u00f6ncelikli olarak tercih ederler \u00e7\u00fcnk\u00fc GCM iki temel sorunu ayn\u0131 anda \u00e7\u00f6zer:<\/p>\n<ol>\n<li><b>G\u00fcvenlik:<\/b> GCM, bir AEAD modudur. Bu, veri gizlili\u011fi ve b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc tek bir verimli ad\u0131mda birle\u015ftirerek, CBC+HMAC gibi eski ve daha karma\u015f\u0131k y\u00f6ntemlerde ortaya \u00e7\u0131kabilecek uygulama hatalar\u0131n\u0131 ve g\u00fcvenlik zafiyetlerini (Padding Oracle gibi) ortadan kald\u0131r\u0131r.<\/li>\n<li><b>Performans:<\/b> GCM&#8217;nin paralelle\u015ftirilebilir yap\u0131s\u0131 ve modern i\u015flemcilerdeki donan\u0131m deste\u011fi (AES-NI), \u00f6zellikle y\u00fcksek hacimli veri transferi gerektiren modern web uygulamalar\u0131 i\u00e7in onu CBC&#8217;den \u00e7ok daha h\u0131zl\u0131 k\u0131lar. Bu, daha h\u0131zl\u0131 sayfa y\u00fckleme s\u00fcreleri ve daha iyi bir kullan\u0131c\u0131 deneyimi anlam\u0131na gelir.<\/li>\n<\/ol>\n<h3><span class=\"ez-toc-section\" id=\"Perfect-Forward-Secrecy-PFS-ile-GCM-Iliskisi\"><\/span>Perfect Forward Secrecy (PFS) ile GCM \u0130li\u015fkisi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Perfect Forward Secrecy (PFS), bir sunucunun uzun vadeli \u00f6zel anahtar\u0131n\u0131n (private key) ele ge\u00e7irilmesi durumunda bile ge\u00e7mi\u015f ileti\u015fimlerin \u015fifresinin \u00e7\u00f6z\u00fclememesini sa\u011flayan bir \u00f6zelliktir. PFS, her bir oturum i\u00e7in ge\u00e7ici (ephemeral) ve benzersiz bir oturum anahtar\u0131 olu\u015fturularak sa\u011flan\u0131r. GCM, do\u011frudan PFS sa\u011flamaz; PFS, ECDHE gibi anahtar de\u011fi\u015fim algoritmalar\u0131n\u0131n bir \u00f6zelli\u011fidir. Ancak GCM&#8217;nin stratejik \u00f6nemi, PFS sa\u011flayan modern \u015fifre paketlerinde neredeyse her zaman varsay\u0131lan operasyon modu olarak se\u00e7ilmesidir. Yani <b>ECDHE + AES-GCM<\/b> kombinasyonu, hem ge\u00e7mi\u015fe d\u00f6n\u00fck g\u00fcvenli\u011fi (PFS) hem de mevcut oturumun y\u00fcksek performansl\u0131 ve do\u011frulanm\u0131\u015f \u015fifrelemesini (GCM) bir araya getirerek g\u00fcn\u00fcm\u00fcz\u00fcn alt\u0131n standard\u0131n\u0131 olu\u015fturur.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"GCM-ve-Diger-Sifreleme-Modlarinin-Karsilastirmasi\"><\/span>GCM ve Di\u011fer \u015eifreleme Modlar\u0131n\u0131n Kar\u015f\u0131la\u015ft\u0131rmas\u0131<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>GCM&#8217;nin modern kriptografide neden bu kadar pop\u00fcler oldu\u011funu anlaman\u0131n en iyi yollar\u0131ndan biri, onu selefi olan CBC (Cipher Block Chaining) gibi daha geleneksel modlarla kar\u015f\u0131la\u015ft\u0131rmakt\u0131r. Bu kar\u015f\u0131la\u015ft\u0131rma, g\u00fcvenlik, performans ve zafiyetlere kar\u015f\u0131 dayan\u0131kl\u0131l\u0131k gibi kritik alanlardaki farklar\u0131 net bir \u015fekilde ortaya koyar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"GCM-vs-CBC-Cipher-Block-Chaining-Guvenlik-Farkliliklari\"><\/span>GCM vs. CBC (Cipher Block Chaining): G\u00fcvenlik Farkl\u0131l\u0131klar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM ve CBC aras\u0131ndaki en temel g\u00fcvenlik fark\u0131, kimlik do\u011frulama yakla\u015f\u0131mlar\u0131ndan kaynaklan\u0131r. GCM, bir <b>AEAD (Authenticated Encryption with Associated Data)<\/b> modudur. Bu, \u015fifreleme ve kimlik do\u011frulaman\u0131n tek, b\u00fct\u00fcnle\u015fik bir operasyon oldu\u011fu anlam\u0131na gelir. Bu yap\u0131, do\u011fas\u0131 gere\u011fi daha g\u00fcvenlidir \u00e7\u00fcnk\u00fc geli\u015ftiricinin iki ayr\u0131 kriptografik i\u015flemi (\u015fifreleme ve MAC) yanl\u0131\u015f bir \u015fekilde bir araya getirme riskini ortadan kald\u0131r\u0131r. \u00d6te yandan, CBC modu sadece gizlilik sa\u011flar. B\u00fct\u00fcnl\u00fck ve kimlik do\u011frulamas\u0131 i\u00e7in, HMAC gibi ayr\u0131 bir Mesaj Do\u011frulama Kodu (MAC) ile birlikte kullan\u0131lmas\u0131 gerekir. Bu &#8220;Encrypt-then-MAC&#8221; (\u00d6nce \u015eifrele, Sonra Do\u011frula) yakla\u015f\u0131m\u0131 g\u00fcvenli kabul edilse de, do\u011fru \u015fekilde uygulanmas\u0131 daha karma\u015f\u0131kt\u0131r ve hatalara a\u00e7\u0131kt\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Performans-Karsilastirmasi-Islem-Hizi-ve-Kaynak-Kullanimi\"><\/span>Performans Kar\u015f\u0131la\u015ft\u0131rmas\u0131: \u0130\u015flem H\u0131z\u0131 ve Kaynak Kullan\u0131m\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Performans, GCM&#8217;nin CBC&#8217;ye kar\u015f\u0131 en ezici \u00fcst\u00fcnl\u00fck kurdu\u011fu aland\u0131r. Bunun temel nedeni, \u00e7al\u0131\u015fma prensiplerindeki farkl\u0131l\u0131kt\u0131r. CBC&#8217;nin zincirleme yap\u0131s\u0131, her blo\u011fun \u015fifrelenmesinin bir \u00f6nceki blo\u011fun tamamlanmas\u0131na ba\u011fl\u0131 oldu\u011fu s\u0131ral\u0131 bir s\u00fcre\u00e7 gerektirir. Bu durum, modern \u00e7ok \u00e7ekirdekli i\u015flemcilerin paralel i\u015flem g\u00fcc\u00fcnden faydalanmas\u0131n\u0131 engeller. GCM ise Counter (CTR) modunu kulland\u0131\u011f\u0131 i\u00e7in her blok birbirinden ba\u011f\u0131ms\u0131z olarak \u015fifrelenebilir. Bu tam paralelle\u015ftirme, GCM&#8217;in \u00f6zellikle donan\u0131m h\u0131zland\u0131rma (AES-NI) deste\u011fiyle birle\u015fti\u011finde CBC&#8217;den kat kat daha h\u0131zl\u0131 olmas\u0131n\u0131 sa\u011flar.<\/p>\n<div class=\"karsilastirma\">\n<table>\n<thead>\n<tr>\n<th>\u00d6zellik<\/th>\n<th>Galois\/Counter Mode (GCM)<\/th>\n<th>Cipher Block Chaining (CBC)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><b>\u00c7al\u0131\u015fma Prensibi<\/b><\/td>\n<td>Paralel (CTR modu tabanl\u0131)<\/td>\n<td>S\u0131ral\u0131 (Zincirleme)<\/td>\n<\/tr>\n<tr>\n<td><b>Kimlik Do\u011frulama<\/b><\/td>\n<td>B\u00fct\u00fcnle\u015fik (AEAD &#8211; GMAC)<\/td>\n<td>Ayr\u0131 bir MAC gerektirir (\u00f6rn: HMAC)<\/td>\n<\/tr>\n<tr>\n<td><b>Performans<\/b><\/td>\n<td>\u00c7ok Y\u00fcksek (Paralelle\u015ftirilebilir)<\/td>\n<td>Daha D\u00fc\u015f\u00fck (S\u0131ral\u0131 i\u015flem)<\/td>\n<\/tr>\n<tr>\n<td><b>Donan\u0131m Deste\u011fi (AES-NI)<\/b><\/td>\n<td>M\u00fckemmel, \u00e7ok verimli<\/td>\n<td>Daha az verimli<\/td>\n<\/tr>\n<tr>\n<td><b>Padding (Dolgu)<\/b><\/td>\n<td>Gerektirmez (Ak\u0131\u015f \u015fifresi gibi \u00e7al\u0131\u015f\u0131r)<\/td>\n<td>Gerektirir<\/td>\n<\/tr>\n<tr>\n<td><b>Zafiyetler<\/b><\/td>\n<td>Nonce tekrar kullan\u0131m\u0131na kar\u015f\u0131 hassas<\/td>\n<td>Padding Oracle sald\u0131r\u0131lar\u0131na kar\u015f\u0131 zafiyetli<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h3><span class=\"ez-toc-section\" id=\"CBC-Modundaki-Zafiyetler-Padding-Oracle-Saldirilari-ve-GCMin-Cozumu\"><\/span>CBC Modundaki Zafiyetler: Padding Oracle Sald\u0131r\u0131lar\u0131 ve GCM&#8217;in \u00c7\u00f6z\u00fcm\u00fc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>CBC&#8217;nin en bilinen zafiyetlerinden biri &#8220;Padding Oracle&#8221; sald\u0131r\u0131lar\u0131d\u0131r. CBC, \u015fifrelenecek son blo\u011fun boyutunu standart blok boyutuna tamamlamak i\u00e7in &#8220;padding&#8221; (dolgu) eklemek zorundad\u0131r. Bir sald\u0131rgan, sunucuya manip\u00fcle edilmi\u015f \u015fifreli metinler g\u00f6ndererek ve sunucunun &#8220;hatal\u0131 padding&#8221; gibi hata mesajlar\u0131n\u0131 g\u00f6zlemleyerek \u015fifreli metnin i\u00e7eri\u011fini yava\u015f yava\u015f \u00e7\u00f6zebilir. Bu sald\u0131r\u0131, ge\u00e7mi\u015fte bir\u00e7ok TLS implementasyonunu etkilemi\u015ftir. GCM ise bir ak\u0131\u015f \u015fifresi gibi \u00e7al\u0131\u015ft\u0131\u011f\u0131 i\u00e7in padding&#8217;e ihtiya\u00e7 duymaz. Bu yap\u0131sal farkl\u0131l\u0131k, GCM&#8217;i Padding Oracle sald\u0131r\u0131lar\u0131na kar\u015f\u0131 tamamen ba\u011f\u0131\u015f\u0131k hale getirir. GCM&#8217;nin \u00e7\u00f6z\u00fcm\u00fc, sorunu yamamak yerine sorunun kayna\u011f\u0131n\u0131 tamamen ortadan kald\u0131rmakt\u0131r.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"GCM-Uygulamalarinda-Dikkat-Edilmesi-Gereken-Guvenlik-Hususlari\"><\/span>GCM Uygulamalar\u0131nda Dikkat Edilmesi Gereken G\u00fcvenlik Hususlar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>GCM, do\u011fru uyguland\u0131\u011f\u0131nda son derece g\u00fcvenli ve h\u0131zl\u0131 bir \u015fifreleme modu olsa da, baz\u0131 kritik kurallara uyulmad\u0131\u011f\u0131 takdirde t\u00fcm g\u00fcvenlik garantilerini yitirebilir. GCM tabanl\u0131 sistemler geli\u015ftirirken veya yap\u0131land\u0131r\u0131rken, bu hususlara \u00f6zellikle dikkat etmek, sistemin b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc korumak i\u00e7in hayati \u00f6nem ta\u015f\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Nonce-Baslatma-Vektoru-Tekrar-Kullanim-Riski-ve-Felaketle-Sonuclanabilen-Etkileri\"><\/span>Nonce (Ba\u015flatma Vekt\u00f6r\u00fc) Tekrar Kullan\u0131m Riski ve Felaketle Sonu\u00e7lanabilen Etkileri<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM g\u00fcvenli\u011findeki en kritik ve affetmez kural budur: <b>Ayn\u0131 anahtar ile asla ayn\u0131 Nonce (IV) de\u011ferini birden fazla kez kullanmay\u0131n.<\/b> Bu kural\u0131n ihlali, kriptografik bir felakete yol a\u00e7ar. E\u011fer bir sald\u0131rgan, ayn\u0131 anahtar ve Nonce ile \u015fifrelenmi\u015f iki farkl\u0131 \u015fifreli metni ele ge\u00e7irirse, bu iki metni XOR&#8217;layarak orijinal (\u015fifresiz) metinlerin XOR&#8217;lanm\u0131\u015f halini elde edebilir. Bu da, metinlerden birinin i\u00e7eri\u011fi tahmin edilebiliyorsa di\u011ferinin kolayca \u00e7\u00f6z\u00fclmesini sa\u011flar ve sistemin t\u00fcm gizlili\u011fini ortadan kald\u0131r\u0131r. Bu nedenle, uygulamalarda Nonce de\u011ferinin her \u015fifreleme i\u015flemi i\u00e7in benzersiz olmas\u0131 (\u00f6rne\u011fin, 96-bitlik rastgele bir b\u00f6l\u00fcm ve 32-bitlik artan bir saya\u00e7 ile) garanti alt\u0131na al\u0131nmal\u0131d\u0131r.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Zayif-Kriptografik-Kutuphanelerin-Kullanimindan-Kacinma\"><\/span>Zay\u0131f Kriptografik K\u00fct\u00fcphanelerin Kullan\u0131m\u0131ndan Ka\u00e7\u0131nma<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Kriptografi, uzmanl\u0131k gerektiren karma\u015f\u0131k bir aland\u0131r. Kendi GCM implementasyonunuzu yazmaya \u00e7al\u0131\u015fmak veya g\u00fcvenilirli\u011fi kan\u0131tlanmam\u0131\u015f, az bilinen k\u00fct\u00fcphaneleri kullanmak, fark edilmesi zor ama kritik g\u00fcvenlik a\u00e7\u0131klar\u0131na yol a\u00e7abilir. Nonce y\u00f6netimi, etiket do\u011frulamas\u0131 veya yan kanal sald\u0131r\u0131lar\u0131na kar\u015f\u0131 koruma gibi detaylarda yap\u0131lacak k\u00fc\u00e7\u00fck bir hata, t\u00fcm sistemin g\u00fcvenli\u011fini tehlikeye atabilir. Her zaman OpenSSL, BoringSSL, LibreSSL veya programlama dilinizin standart kriptografi k\u00fct\u00fcphaneleri gibi geni\u015f kitleler taraf\u0131ndan test edilmi\u015f, g\u00fcvenilirli\u011fi kan\u0131tlanm\u0131\u015f ve d\u00fczenli olarak g\u00fcncellenen k\u00fct\u00fcphaneleri tercih edin.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Dogru-Anahtar-Yonetiminin-ve-Anahtar-Boyutunun-Onemi\"><\/span>Do\u011fru Anahtar Y\u00f6netiminin ve Anahtar Boyutunun \u00d6nemi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM&#8217;in g\u00fcvenli\u011fi, temelindeki \u015fifreleme algoritmas\u0131n\u0131n (genellikle AES) anahtar\u0131na ba\u011fl\u0131d\u0131r. Bu nedenle, g\u00fc\u00e7l\u00fc anahtar y\u00f6netimi pratikleri esast\u0131r:<\/p>\n<ul>\n<li><b>Anahtar \u00dcretimi:<\/b> Anahtarlar, kriptografik olarak g\u00fcvenli bir rastgele say\u0131 \u00fcreteci (CSPRNG) kullan\u0131larak olu\u015fturulmal\u0131d\u0131r. Tahmin edilebilir anahtarlar, \u015fifrelemenin hi\u00e7bir anlam\u0131 kalmamas\u0131na neden olur.<\/li>\n<li><b>Anahtar Depolama:<\/b> Anahtarlar, donan\u0131m g\u00fcvenlik mod\u00fclleri (HSM) gibi g\u00fcvenli ortamlarda saklanmal\u0131 ve yetkisiz eri\u015fime kar\u015f\u0131 korunmal\u0131d\u0131r.<\/li>\n<li><b>Anahtar D\u00f6ng\u00fcs\u00fc (Rotation):<\/b> Anahtarlar d\u00fczenli aral\u0131klarla de\u011fi\u015ftirilmelidir. Bu, bir anahtar\u0131n ele ge\u00e7irilmesi durumunda maruz kal\u0131nacak riski s\u0131n\u0131rlar.<\/li>\n<li><b>Anahtar Boyutu:<\/b> AES-GCM i\u00e7in genellikle 128-bit veya 256-bit anahtar boyutlar\u0131 kullan\u0131l\u0131r. AES-128 g\u00fcn\u00fcm\u00fcz standartlar\u0131nda \u00e7o\u011fu uygulama i\u00e7in yeterince g\u00fcvenli kabul edilirken, daha y\u00fcksek g\u00fcvenlik gereksinimleri olan sistemler i\u00e7in AES-256 tercih edilebilir.<\/li>\n<\/ul>\n<div class=\"karsilastirma\">\n<table>\n<thead>\n<tr>\n<th>G\u00fcvenlik Hususu<\/th>\n<th>Risk<\/th>\n<th>\u00d6nlem \/ En \u0130yi Uygulama<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td><b>Nonce Tekrar Kullan\u0131m\u0131<\/b><\/td>\n<td>Gizlili\u011fin tamamen kayb\u0131, \u015fifreli metinlerin \u00e7\u00f6z\u00fclebilmesi.<\/td>\n<td>Her \u015fifreleme i\u015flemi i\u00e7in mutlak surette benzersiz bir Nonce kullan\u0131lmal\u0131d\u0131r.<\/td>\n<\/tr>\n<tr>\n<td><b>Zay\u0131f K\u00fct\u00fcphane<\/b><\/td>\n<td>\u00d6ng\u00f6r\u00fclemeyen zafiyetler, yan kanal sald\u0131r\u0131lar\u0131, hatal\u0131 implementasyon.<\/td>\n<td>Sadece g\u00fcvenilir, standart ve iyi denetlenmi\u015f kriptografik k\u00fct\u00fcphaneler (OpenSSL vb.) kullan\u0131lmal\u0131d\u0131r.<\/td>\n<\/tr>\n<tr>\n<td><b>Zay\u0131f Anahtar Y\u00f6netimi<\/b><\/td>\n<td>Anahtar\u0131n tahmin edilmesi veya \u00e7al\u0131nmas\u0131, t\u00fcm sistemin \u00e7\u00f6kmesi.<\/td>\n<td>G\u00fc\u00e7l\u00fc rastgelelik ile anahtar \u00fcretimi, g\u00fcvenli depolama ve d\u00fczenli anahtar rotasyonu yap\u0131lmal\u0131d\u0131r.<\/td>\n<\/tr>\n<tr>\n<td><b>Kimlik Do\u011frulama Etiketini (Tag) Kontrol Etmeme<\/b><\/td>\n<td>Veri b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fcn kayb\u0131, manip\u00fcle edilmi\u015f verilerin kabul edilmesi.<\/td>\n<td>\u015eifre \u00e7\u00f6zme i\u015fleminden \u00f6nce kimlik do\u011frulama etiketi her zaman do\u011frulanmal\u0131d\u0131r.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<h2><span class=\"ez-toc-section\" id=\"Guvenli-ve-Hizli-TLS-Baglantilari-Icin-Neden-IHS-Telekomu-Tercih-Etmelisiniz\"><\/span>G\u00fcvenli ve H\u0131zl\u0131 TLS Ba\u011flant\u0131lar\u0131 \u0130\u00e7in Neden \u0130HS Telekom&#8217;u Tercih Etmelisiniz?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Web sitenizin g\u00fcvenli\u011fi ve h\u0131z\u0131, ziyaret\u00e7i g\u00fcvenini kazanmak, SEO s\u0131ralamalar\u0131n\u0131 iyile\u015ftirmek ve en iyi kullan\u0131c\u0131 deneyimini sunmak i\u00e7in kritik \u00f6neme sahiptir. Galois\/Counter Mode (GCM) gibi modern \u015fifreleme teknolojilerinin t\u00fcm avantajlar\u0131ndan yararlanmak, do\u011fru altyap\u0131 ve uzman deste\u011fi ile m\u00fcmk\u00fcnd\u00fcr. \u0130HS Telekom olarak, web sitenizin en g\u00fcncel g\u00fcvenlik ve performans standartlar\u0131na ula\u015fmas\u0131 i\u00e7in kapsaml\u0131 \u00e7\u00f6z\u00fcmler sunuyoruz.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"En-Guncel-ve-Guclu-GCM-Sifre-Paketlerini-Destekleyen-SSL-Sertifikalari\"><\/span>En G\u00fcncel ve G\u00fc\u00e7l\u00fc GCM \u015eifre Paketlerini Destekleyen SSL Sertifikalar\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>G\u00fcvenli bir TLS ba\u011flant\u0131s\u0131n\u0131n temeli, do\u011fru yap\u0131land\u0131r\u0131lm\u0131\u015f bir <a href=\"https:\/\/www.ihs.com.tr\/ssl\/\" target=\"_blank\">SSL sertifikas\u0131<\/a> ile at\u0131l\u0131r. \u0130HS Telekom, sundu\u011fu t\u00fcm SSL sertifikalar\u0131n\u0131n, ECDHE ve AES-GCM gibi modern, h\u0131zl\u0131 ve g\u00fcvenli algoritmalar\u0131 i\u00e7eren \u015fifre paketlerini tam olarak desteklemesini sa\u011flar. Bu sayede, web siteniz bilinen zafiyetlere kar\u015f\u0131 korunurken, ziyaret\u00e7ileriniz i\u00e7in m\u00fcmk\u00fcn olan en h\u0131zl\u0131 ba\u011flant\u0131 h\u0131z\u0131n\u0131 sunar. Zay\u0131f ve eski \u015fifreleme y\u00f6ntemlerine kar\u015f\u0131 tam koruma sa\u011flars\u0131n\u0131z.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Uzman-Teknik-Destek-ile-Dogru-TLS-Yapilandirmasi-Danismanligi\"><\/span>Uzman Teknik Destek ile Do\u011fru TLS Yap\u0131land\u0131rmas\u0131 Dan\u0131\u015fmanl\u0131\u011f\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bir <a href=\"https:\/\/www.ihs.com.tr\/blog\/ssl-sertifikasi-nedir-onemlidir\/\" target=\"_blank\">SSL sertifikas\u0131<\/a> almak kadar, onu sunucuda do\u011fru bir \u015fekilde yap\u0131land\u0131rmak da \u00f6nemlidir. Hangi \u015fifre paketlerinin etkinle\u015ftirilece\u011fi, hangi protokol s\u00fcr\u00fcmlerinin kullan\u0131laca\u011f\u0131 gibi teknik ayarlar, sitenizin hem g\u00fcvenli\u011fini hem de performans\u0131n\u0131 do\u011frudan etkiler. \u0130HS Telekom&#8217;un deneyimli teknik destek ekibi, sunucunuz i\u00e7in en ideal TLS yap\u0131land\u0131rmas\u0131n\u0131 yapman\u0131z konusunda size rehberlik ederek, GCM&#8217;nin t\u00fcm avantajlar\u0131ndan eksiksiz bir \u015fekilde yararlanman\u0131z\u0131 sa\u011flar.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Yuksek-Performansli-Altyapi-ile-Maksimum-Baglanti-Hizi-ve-Guvenligi\"><\/span>Y\u00fcksek Performansl\u0131 Altyap\u0131 ile Maksimum Ba\u011flant\u0131 H\u0131z\u0131 ve G\u00fcvenli\u011fi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>GCM&#8217;nin donan\u0131m h\u0131zland\u0131rma (AES-NI) gibi \u00f6zelliklerinden tam olarak faydalanabilmek i\u00e7in modern ve g\u00fc\u00e7l\u00fc bir altyap\u0131 gereklidir. \u0130HS Telekom, en yeni nesil i\u015flemcilere ve y\u00fcksek h\u0131zl\u0131 a\u011f ba\u011flant\u0131lar\u0131na sahip sunucular\u0131 ile GCM tabanl\u0131 \u015fifrelemenin getirdi\u011fi performans art\u0131\u015f\u0131n\u0131 sonuna kadar kullanman\u0131za olanak tan\u0131r. <a href=\"https:\/\/www.ihs.com.tr\/web-hosting\/\" target=\"_blank\">Hosting<\/a> hizmetlerimiz, d\u00fc\u015f\u00fck gecikme ve y\u00fcksek i\u015flem kapasitesi sunarak sitenizin \u0131\u015f\u0131k h\u0131z\u0131nda a\u00e7\u0131lmas\u0131na yard\u0131mc\u0131 olur.<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Otomatik-Kurulum-Yonetim-Kolayligi-ve-Uygun-Fiyatli-Cozumler\"><\/span>Otomatik Kurulum, Y\u00f6netim Kolayl\u0131\u011f\u0131 ve Uygun Fiyatl\u0131 \u00c7\u00f6z\u00fcmler<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Teknik detaylarla u\u011fra\u015fmak istemeyen kullan\u0131c\u0131lar i\u00e7in s\u00fcreci basitle\u015ftiriyoruz. Sundu\u011fumuz kontrol panelleri \u00fczerinden SSL sertifikas\u0131 kurulumu ve y\u00f6netimi gibi i\u015flemler kolayca yap\u0131labilir. Otomatik yenileme ve kurulum se\u00e7eneklerimizle sitenizin g\u00fcvenli\u011finin kesintisiz olmas\u0131n\u0131 sa\u011fl\u0131yoruz. T\u00fcm bu modern teknoloji ve uzman deste\u011fini, b\u00fct\u00e7enize uygun, rekabet\u00e7i fiyatlarla sunarak g\u00fcvenli ve h\u0131zl\u0131 bir web sitesine sahip olman\u0131z\u0131 kolayla\u015ft\u0131r\u0131yoruz. Projeniz i\u00e7in ister payla\u015f\u0131ml\u0131 bir <a href=\"https:\/\/www.ihs.com.tr\/web-hosting\/wordpress-hosting.html\" target=\"_blank\">wordpress hosting<\/a>, ister g\u00fc\u00e7l\u00fc bir <a href=\"https:\/\/www.ihs.com.tr\/sunucu-kiralama\/vps-server.html\" target=\"_blank\">vps<\/a> veya <a href=\"https:\/\/www.ihs.com.tr\/sunucu-kiralama\/vds-sunucu.html\" target=\"_blank\">vds<\/a> ar\u0131yor olun, size en uygun \u00e7\u00f6z\u00fcm\u00fc sunmaya haz\u0131r\u0131z. Bir <a href=\"https:\/\/www.ihs.com.tr\/domain\/alan-adi-domain-tescili.html\" target=\"_blank\">domain<\/a> tescil ederek ilk ad\u0131m\u0131 atabilirsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u0130nternet \u00fczerindeki dijital ileti\u015fimimizin temel ta\u015flar\u0131ndan olan g\u00fcvenlik ve h\u0131z, s\u00fcrekli geli\u015fen teknolojilerle yeni boyutlar kazan\u0131yor. Online bankac\u0131l\u0131ktan e-ticarete, anl\u0131k mesajla\u015fmadan bulut&hellip;<\/p>\n","protected":false},"author":3,"featured_media":16540,"comment_status":"open","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[400],"tags":[],"class_list":["post-16539","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ssl-sertifikasi"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/posts\/16539","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/comments?post=16539"}],"version-history":[{"count":1,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/posts\/16539\/revisions"}],"predecessor-version":[{"id":16541,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/posts\/16539\/revisions\/16541"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/media\/16540"}],"wp:attachment":[{"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/media?parent=16539"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/categories?post=16539"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ihs.com.tr\/blog\/wp-json\/wp\/v2\/tags?post=16539"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}