{"id":10276,"date":"2026-11-08T20:55:05","date_gmt":"2026-11-08T17:55:05","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10276"},"modified":"2026-11-08T20:55:05","modified_gmt":"2026-11-08T17:55:05","slug":"iki-adimli-dogrulama-nedir","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/iki-adimli-dogrulama-nedir\/","title":{"rendered":"\u0130ki Ad\u0131ml\u0131 Do\u011frulama Nedir?"},"content":{"rendered":"\n<p class=\"wp-block-paragraph\">Geleneksel kullan\u0131c\u0131 ad\u0131 ve parola ikilisi, modern siber tehditler kar\u015f\u0131s\u0131nda tek ba\u015f\u0131na yeterli bir savunma hatt\u0131 sunamaz. Veri s\u0131z\u0131nt\u0131lar\u0131, kimlik av\u0131 (phishing) sald\u0131r\u0131lar\u0131 ve kaba kuvvet (brute-force) denemeleri sonucunda parolalar kolayl\u0131kla ele ge\u00e7irilebilir. \u0130ki ad\u0131ml\u0131 do\u011frulama, parolan\u0131z bir sald\u0131rgan\u0131n eline ge\u00e7se bile hesab\u0131n\u0131za yetkisiz eri\u015fimi engellemek i\u00e7in tasarlanm\u0131\u015f ek bir g\u00fcvenlik katman\u0131d\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0130ki Ad\u0131ml\u0131 Do\u011frulama Nedir ve Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ki ad\u0131ml\u0131 do\u011frulama, kullan\u0131c\u0131n\u0131n bir sisteme eri\u015fim sa\u011flamadan \u00f6nce iki farkl\u0131 do\u011frulama a\u015famas\u0131n\u0131 ba\u015far\u0131yla tamamlamas\u0131n\u0131 gerektiren bir g\u00fcvenlik s\u00fcrecidir. Temel mant\u0131k, tek bir bilgiye (parolaya) g\u00fcvenmek yerine, birbirinden ba\u011f\u0131ms\u0131z iki kan\u0131t\u0131n sunulmas\u0131n\u0131 zorunlu k\u0131lmakt\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kimlik do\u011frulama s\u00fcre\u00e7leri siber g\u00fcvenlikte \u00fc\u00e7 temel fakt\u00f6r \u00fczerine kuruludur:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Bildi\u011finiz bir \u015fey: Parola, PIN kodu veya bir g\u00fcvenlik sorusunun yan\u0131t\u0131.<\/li>\n\n<li>Sahip oldu\u011funuz bir \u015fey: Ak\u0131ll\u0131 telefon, donan\u0131msal g\u00fcvenlik anahtar\u0131 veya SMS alabilen bir SIM kart.<\/li>\n\n<li>Oldu\u011funuz bir \u015fey: Parmak izi, y\u00fcz tan\u0131ma veya retina taramas\u0131 gibi biyometrik veriler.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ki ad\u0131ml\u0131 do\u011frulama mekanizmas\u0131, yukar\u0131da listelenen kategorilerin en az ikisinden birer \u00f6ge talep etti\u011finde iki fakt\u00f6rl\u00fc do\u011frulama (2FA) olarak adland\u0131r\u0131l\u0131r. \u00d6rne\u011fin parolan\u0131z\u0131 girdikten sonra telefonunuza gelen bir kodu yazman\u0131z, &#8220;bildi\u011finiz&#8221; ve &#8220;sahip oldu\u011funuz&#8221; iki ayr\u0131 fakt\u00f6r\u00fcn birle\u015fimidir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">En Yayg\u0131n \u0130ki Ad\u0131ml\u0131 Do\u011frulama T\u00fcrleri<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Sistemlerin sundu\u011fu g\u00fcvenlik seviyesi ve kullan\u0131c\u0131 deneyimi, tercih edilen do\u011frulama y\u00f6ntemine g\u00f6re de\u011fi\u015fiklik g\u00f6sterir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">SMS ve E-posta ile Do\u011frulama<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Kullan\u0131c\u0131 ad\u0131 ve parola girildikten sonra sisteme kay\u0131tl\u0131 telefon numaras\u0131na veya e-posta adresine tek kullan\u0131ml\u0131k bir kod g\u00f6nderilir. Kurulumu en zahmetsiz y\u00f6ntem olsa da g\u00fcvenlik uzmanlar\u0131 taraf\u0131ndan en zay\u0131f halka olarak kabul edilir. SIM takas\u0131 (SIM swap) sald\u0131r\u0131lar\u0131 veya h\u00fccresel a\u011f a\u00e7\u0131klar\u0131n\u0131n (SS7 protokol\u00fc zaafiyetleri) k\u00f6t\u00fcye kullan\u0131lmas\u0131 durumunda bu kodlar sald\u0131rganlar taraf\u0131ndan ele ge\u00e7irilebilir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">TOTP (Zamana Dayal\u0131 Tek Kullan\u0131ml\u0131k Parola)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Google Authenticator, Microsoft Authenticator veya Aegis gibi uygulamalar taraf\u0131ndan kullan\u0131lan standart y\u00f6ntemdir. RFC 6238 protokol\u00fcne dayan\u0131r. Sunucu ve mobil uygulama, kurulum esnas\u0131nda payla\u015f\u0131lan gizli bir anahtar\u0131 ve mevcut zaman dilimini temel alarak genellikle 30 saniyede bir de\u011fi\u015fen alt\u0131 haneli kodlar \u00fcretir. \u0130nternet ba\u011flant\u0131s\u0131 gerektirmez ve SMS tabanl\u0131 sald\u0131r\u0131lara kar\u015f\u0131 tamamen korunakl\u0131d\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Donan\u0131msal G\u00fcvenlik Anahtarlar\u0131 (FIDO2 \/ U2F)<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">YubiKey benzeri fiziksel USB veya NFC cihazlar\u0131d\u0131r. Kullan\u0131c\u0131, cihaz\u0131 bilgisayar\u0131na takar veya telefonuna dokundurur ve \u00fczerindeki fiziksel d\u00fc\u011fmeye basar. Kriptografik anahtar \u00e7iftleri \u00fczerinden do\u011frulama yap\u0131ld\u0131\u011f\u0131 i\u00e7in kimlik av\u0131 siteleri bu y\u00f6ntemi a\u015famaz. G\u00fcn\u00fcm\u00fczdeki en g\u00fcvenli iki ad\u0131ml\u0131 do\u011frulama y\u00f6ntemidir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">TOTP Algoritmas\u0131n\u0131n Mant\u0131\u011f\u0131 ve Kod \u00d6rne\u011fi<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Zamana dayal\u0131 tek kullan\u0131ml\u0131k parolalar, sunucu ile istemci aras\u0131nda payla\u015f\u0131lan bir simetrik anahtar (Secret Key) ve Unix zaman damgas\u0131 kullan\u0131larak HMAC-SHA1 algoritmas\u0131 ile t\u00fcretilir. Algoritma \u015fu ad\u0131mlarla \u00e7al\u0131\u015f\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mevcut Unix zaman\u0131 30 saniyelik bloklara b\u00f6l\u00fcnerek bir saya\u00e7 olu\u015fturulur.<\/li>\n\n<li>Saya\u00e7 de\u011feri ile gizli anahtar, HMAC algoritmas\u0131 \u00fczerinden bir \u00f6zet (hash) \u00fcretir.<\/li>\n\n<li>\u00dcretilen 20 baytl\u0131k \u00f6zetten dinamik olarak 4 bayt se\u00e7ilir ve 6 haneli bir say\u0131ya d\u00f6n\u00fc\u015ft\u00fcr\u00fcl\u00fcr.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">A\u015fa\u011f\u0131daki Python kodu, herhangi bir harici k\u00fct\u00fcphaneye ihtiya\u00e7 duymadan standart k\u00fct\u00fcphanelerle bu s\u00fcreci sim\u00fcle eder:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import hmac\nimport hashlib\nimport time\nimport struct\nimport base64\n\ndef totp_kodu_uret(gizli_anahtar):\n    anahtar_bayt = base64.b32decode(gizli_anahtar, casefold=True)\n    zaman_araligi = int(time.time()) \/\/ 30\n    mesaj = struct.pack(\"&gt;Q\", zaman_araligi)\n    hmac_ozet = hmac.new(anahtar_bayt, mesaj, hashlib.sha1).digest()\n    \n    ofset = hmac_ozet[19] &amp; 15\n    ikili_kod = (struct.unpack(\"&gt;I\", hmac_ozet[ofset:ofset+4])[0] &amp; 0x7fffffff)\n    \n    kod = ikili_kod % 1000000\n    return f\"{kod:06d}\"\n\nornek_anahtar = \"JBSWY3DPEHPK3PXP\"\nprint(\"Mevcut 30 saniyelik kod:\", totp_kodu_uret(ornek_anahtar))<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu kod blo\u011funda, Base32 ile kodlanm\u0131\u015f gizli anahtar \u00e7\u00f6z\u00fcl\u00fcr, o anki zaman damgas\u0131 30&#8217;a b\u00f6l\u00fcnerek 8 baytl\u0131k bir tamsay\u0131ya d\u00f6n\u00fc\u015ft\u00fcr\u00fcl\u00fcr ve HMAC-SHA1 ile \u015fifrelenir. Elde edilen \u00f6zet i\u00e7erisinden ofset de\u011ferine g\u00f6re dinamik olarak 6 haneli do\u011frulama kodu \u00e7\u0131kar\u0131l\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Linux Sunucularda SSH \u0130\u00e7in \u0130ki Ad\u0131ml\u0131 Do\u011frulama Kurulumu<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Linux sunucu y\u00f6neticileri, uzaktan y\u00f6netim oturumlar\u0131n\u0131 g\u00fcvene almak i\u00e7in SSH ba\u011flant\u0131lar\u0131na PAM (Pluggable Authentication Modules) \u00fczerinden iki ad\u0131ml\u0131 do\u011frulama ekleyebilir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Ubuntu veya Debian tabanl\u0131 bir sunucuda bu i\u015flemi ger\u00e7ekle\u015ftirmek i\u00e7in \u00f6ncelikle ilgili mod\u00fcl y\u00fcklenir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt update\nsudo apt install libpam-google-authenticator -y<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Mod\u00fcl y\u00fcklendikten sonra sunucuda oturum a\u00e7t\u0131\u011f\u0131n\u0131z kullan\u0131c\u0131 hesab\u0131 \u00fczerinden do\u011frulama sihirbaz\u0131 \u00e7al\u0131\u015ft\u0131r\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>google-authenticator<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu komut ekranda bir QR kod ve kurtarma kodlar\u0131 g\u00f6r\u00fcnt\u00fcler. QR kodu mobil uygulaman\u0131za okuttuktan sonra sihirbaz\u0131n sorular\u0131na onay verilir. Ard\u0131ndan SSH yap\u0131land\u0131rmas\u0131nda de\u011fi\u015fiklik yap\u0131l\u0131r.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">PAM SSH yap\u0131land\u0131rma dosyas\u0131 d\u00fczenlenir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo nano \/etc\/pam.d\/sshd<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Dosyan\u0131n en alt\u0131na \u015fu sat\u0131r eklenir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>auth required pam_google_authenticator.so<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Son olarak SSH daemon yap\u0131land\u0131rma dosyas\u0131 a\u00e7\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo nano \/etc\/ssh\/sshd_config<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Dosya i\u00e7erisinde <code>KbdInteractiveAuthentication<\/code> (veya eski s\u00fcr\u00fcmlerde <code>ChallengeResponseAuthentication<\/code>) ayar\u0131 bulunarak <code>yes<\/code> yap\u0131l\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>KbdInteractiveAuthentication yes<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Servis yeniden ba\u015flat\u0131larak ayarlar devreye al\u0131n\u0131r:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo systemctl restart ssh<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu ad\u0131mdan sonra sunucuya parola ile ba\u011flan\u0131rken, parolan\u0131n ard\u0131ndan mobil uygulamadaki tek kullan\u0131ml\u0131k kod talep edilir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u0130ki Ad\u0131ml\u0131 Do\u011frulamada G\u00fcvenlik Riskleri ve Kurtarma Kodlar\u0131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ki ad\u0131ml\u0131 do\u011frulama g\u00fc\u00e7l\u00fc bir g\u00fcvenlik sa\u011flasa da kullan\u0131c\u0131 kaynakl\u0131 riskler bar\u0131nd\u0131r\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Cihaz kayb\u0131: Telefonun bozulmas\u0131, \u00e7al\u0131nmas\u0131 veya kaybolmas\u0131 durumunda hesaplara eri\u015fim kesilebilir.<\/li>\n\n<li>Kurtarma kodlar\u0131n\u0131n ihmali: Kurulum s\u0131ras\u0131nda verilen tek kullan\u0131ml\u0131k yedek kodlar g\u00fcvenli ve \u00e7evrim d\u0131\u015f\u0131 bir ortamda saklanmal\u0131d\u0131r.<\/li>\n\n<li>Yorgunluk sald\u0131r\u0131lar\u0131: Sald\u0131rganlar arka arkaya onay bildirimleri g\u00f6ndererek kullan\u0131c\u0131n\u0131n yanl\u0131\u015fl\u0131kla &#8220;Onayla&#8221; butonuna basmas\u0131n\u0131 sa\u011flayabilir (MFA Fatigue).<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Bu riskleri en aza indirmek i\u00e7in SMS yerine mutlaka TOTP tabanl\u0131 bir uygulama kullan\u0131lmal\u0131, yedek kodlar \u015fifreli bir parola y\u00f6neticisinde veya fiziksel bir not defterinde saklanmal\u0131d\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u00d6zet ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130ki ad\u0131ml\u0131 do\u011frulama, dijital varl\u0131klar\u0131n\u0131z\u0131 koruman\u0131n en maliyetsiz ve en etkili yoludur. Parolan\u0131z ne kadar karma\u015f\u0131k olursa olsun, tek ba\u015f\u0131na k\u0131r\u0131lma riskine a\u00e7\u0131kt\u0131r; ikinci bir do\u011frulama ad\u0131m\u0131 bu riski neredeyse tamamen ortadan kald\u0131r\u0131r. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130lk ad\u0131m olarak birincil e-posta adresiniz, bankac\u0131l\u0131k uygulamalar\u0131n\u0131z ve kod depolar\u0131n\u0131z (GitHub, GitLab vb.) \u00fczerindeki g\u00fcvenlik ayarlar\u0131n\u0131 inceleyip iki ad\u0131ml\u0131 do\u011frulamay\u0131 aktif hale getirebilirsiniz.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Parolalar\u0131n tek ba\u015f\u0131na yetersiz kald\u0131\u011f\u0131 g\u00fcn\u00fcm\u00fczde iki ad\u0131ml\u0131 do\u011frulama, dijital hesaplar\u0131n\u0131z\u0131 ele ge\u00e7irilmeye kar\u015f\u0131 koruyan kritik bir g\u00fcvenlik katman\u0131d\u0131r.<\/p>","protected":false},"author":1,"featured_media":10277,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[229],"tags":[578,577,580,11,579],"class_list":["post-10276","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-siber-guvenlik","tag-2fa","tag-iki-adimli-dogrulama","tag-kimlik-dogrulama","tag-siber-guvenlik","tag-totp"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u0130ki Ad\u0131ml\u0131 Do\u011frulama Nedir? 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