{"id":10282,"date":"2026-11-10T08:00:00","date_gmt":"2026-11-10T05:00:00","guid":{"rendered":"https:\/\/www.yunuskaytan.com\/?p=10282"},"modified":"2026-11-10T08:00:00","modified_gmt":"2026-11-10T05:00:00","slug":"sifreleme-ve-hash-farki","status":"publish","type":"post","link":"https:\/\/www.yunuskaytan.com\/en\/yk\/sifreleme-ve-hash-farki\/","title":{"rendered":"\u015eifreleme ve Hash Fark\u0131"},"content":{"rendered":"<p class=\"wp-block-paragraph\">Bilgi g\u00fcvenli\u011fi ve yaz\u0131l\u0131m geli\u015ftirme s\u00fcre\u00e7lerinde en s\u0131k birbirine kar\u0131\u015ft\u0131r\u0131lan kavramlar\u0131n ba\u015f\u0131nda \u015fifreleme (encryption) ve \u00f6zetleme (hashing) gelir. \u00c7o\u011fu zaman kullan\u0131c\u0131 parolalar\u0131n\u0131n &#8220;\u015fifrelendi\u011fi&#8221; s\u00f6ylenir; oysa modern g\u00fcvenlik mimarilerinde parolalar \u015fifrelenmez, \u00f6zetlenir. Bu iki terimin yanl\u0131\u015f anla\u015f\u0131lmas\u0131, veri taban\u0131 tasar\u0131m\u0131ndan a\u011f ileti\u015fimine kadar kritik g\u00fcvenlik a\u00e7\u0131klar\u0131na yol a\u00e7abilir. Bu yaz\u0131da, hash \u015fifreleme fark\u0131 konusunu temel \u00e7al\u0131\u015fma prensiplerinden pratik kod \u00f6rneklerine kadar ad\u0131m ad\u0131m ele alaca\u011f\u0131z.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u015eifreleme (Encryption) Nedir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eifreleme, okunabilir formdaki d\u00fcz metin (plaintext) veriyi, yetkisiz ki\u015filerin anlayamayaca\u011f\u0131 anlams\u0131z bir bi\u00e7ime (ciphertext) d\u00f6n\u00fc\u015ft\u00fcrme i\u015flemidir. \u015eifrelemenin en belirleyici \u00f6zelli\u011fi iki y\u00f6nl\u00fc (two-way) bir s\u00fcre\u00e7 olmas\u0131d\u0131r. Yani uygun anahtara sahip olan ki\u015fi, \u015fifrelenmi\u015f metni tekrar orijinal haline d\u00f6n\u00fc\u015ft\u00fcrebilir.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eifreleme temel olarak iki ana kategoriye ayr\u0131l\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Simetrik \u015eifreleme: Veriyi \u015fifrelemek ve de\u015fifre etmek i\u00e7in ayn\u0131 gizli anahtar kullan\u0131l\u0131r. AES (Advanced Encryption Standard) ve ChaCha20 bu y\u00f6ntemin modern \u00f6rneklerindendir.<\/li>\n\n<li>Asimetrik \u015eifreleme: Biri \u015fifreleme (kamusal anahtar \/ public key), di\u011feri de\u015fifre etme (\u00f6zel anahtar \/ private key) i\u00e7in kullan\u0131lan iki farkl\u0131 matematiksel anahtar \u00e7iftine dayan\u0131r. RSA ve ECC (Eliptik E\u011fri Kriptografisi) bu gruptad\u0131r.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eifrelemenin temel amac\u0131 gizliliktir (confidentiality). Veri bir a\u011f \u00fczerinden aktar\u0131l\u0131rken (HTTPS, SSH) veya diskte saklan\u0131rken (BitLocker, LUKS) \u00fc\u00e7\u00fcnc\u00fc taraflar\u0131n i\u00e7eri\u011fi okumas\u0131n\u0131 engellemek i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">OpenSSL ile Simetrik \u015eifreleme \u00d6rne\u011fi<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A\u015fa\u011f\u0131daki komut sat\u0131r\u0131 \u00f6rne\u011finde, AES-256-CBC algoritmas\u0131 ve PBKDF2 anahtar t\u00fcretme fonksiyonu kullan\u0131larak bir dosya \u015fifrelenmekte ve ard\u0131ndan ayn\u0131 parola ile de\u015fifre edilmektedir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>echo \"Bu gizli bir iletidir.\" &gt; veri.txt\nopenssl enc -aes-256-cbc -pbkdf2 -salt -in veri.txt -out veri.enc -k GizliAnahtar456\nopenssl enc -d -aes-256-cbc -pbkdf2 -in veri.enc -out cozulmus.txt -k GizliAnahtar456\ncat cozulmus.txt<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">\u0130lk sat\u0131rda test verisi olu\u015fturulur. \u0130kinci komutta metin AES-256-CBC ile \u015fifrelenir ve \u00e7\u0131kt\u0131 okunamaz bir ikili dosyaya yaz\u0131l\u0131r. \u00dc\u00e7\u00fcnc\u00fc komut ise <code>-d<\/code> parametresiyle do\u011fru parolay\u0131 vererek veriyi tekrar orijinal haline \u00e7evirir. Do\u011fru anahtar girilmezse orijinal metne ula\u015f\u0131lamaz.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hash (\u00d6zetleme) Nedir?<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Hash i\u015flemi, girdi olarak verilen herhangi bir boyuttaki veriyi alan ve sabit uzunlukta benzersiz bir karakter dizisine (\u00f6zet \/ digest) d\u00f6n\u00fc\u015ft\u00fcren tek y\u00f6nl\u00fc (one-way) matematiksel bir fonksiyondur.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Kriptografik bir hash fonksiyonunun \u015fu temel \u00f6zellikleri sa\u011flamas\u0131 gerekir:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Tek Y\u00f6nl\u00fc Olmas\u0131: Elde edilen \u00f6zet de\u011ferinden orijinal girdiyi matematiksel olarak geri hesaplamak imkans\u0131z olmal\u0131d\u0131r.<\/li>\n\n<li>Deterministik Yap\u0131: Ayn\u0131 girdi, ayn\u0131 hash fonksiyonuna her verildi\u011finde istisnas\u0131z olarak her zaman ayn\u0131 \u00f6zeti \u00fcretmelidir.<\/li>\n\n<li>\u00c7\u0131\u011f Etkisi (Avalanche Effect): Girdideki tek bir harf veya noktalama i\u015fareti de\u011fi\u015fti\u011finde bile \u00fcretilen \u00f6zet de\u011ferinin tamamen farkl\u0131la\u015fmas\u0131 gerekir.<\/li>\n\n<li>\u00c7ak\u0131\u015fma Direnci (Collision Resistance): Farkl\u0131 iki verinin ayn\u0131 hash sonucunu \u00fcretmesi matematiksel olarak son derece d\u00fc\u015f\u00fck bir ihtimal olmal\u0131d\u0131r.<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Pop\u00fcler hash algoritmalar\u0131na SHA-256, SHA-3 ve parola saklama i\u00e7in tasarlanm\u0131\u015f bcrypt, Argon2 gibi algoritmalar \u00f6rnek verilebilir.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Python ile Hash Hesaplama \u00d6rne\u011fi<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">A\u015fa\u011f\u0131daki Python \u00f6rne\u011fi, standart <code>hashlib<\/code> mod\u00fcl\u00fc ile SHA-256 \u00f6zetinin nas\u0131l hesapland\u0131\u011f\u0131n\u0131 g\u00f6sterir:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import hashlib\n\nmetin1 = \"siberguvenlik\"\nmetin2 = \"siberguvenliK\"\n\nhash1 = hashlib.sha256(metin1.encode(\"utf-8\")).hexdigest()\nhash2 = hashlib.sha256(metin2.encode(\"utf-8\")).hexdigest()\n\nprint(\"Metin 1 Hash:\", hash1)\nprint(\"Metin 2 Hash:\", hash2)<\/code><\/pre>\n\n\n\n<p class=\"wp-block-paragraph\">Bu kod \u00e7al\u0131\u015ft\u0131r\u0131ld\u0131\u011f\u0131nda, iki metin aras\u0131ndaki tek fark olan son harfin b\u00fcy\u00fckl\u00fc\u011f\u00fc nedeniyle tamamen farkl\u0131 iki 64 karakterlik onalt\u0131l\u0131k \u00e7\u0131kt\u0131 \u00fcretilir. \u00dcretilen bu hash de\u011ferlerinden orijinal &#8220;siberguvenlik&#8221; metnini tersine \u00e7evirerek bulacak bir de\u015fifre fonksiyonu yoktur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hash \u015eifreleme Fark\u0131: Temel Kar\u015f\u0131la\u015ft\u0131rma Noktalar\u0131<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Kriptografik tasar\u0131m yaparken do\u011fru y\u00f6ntemi se\u00e7ebilmek i\u00e7in hash \u015fifreleme fark\u0131 kavram\u0131n\u0131 d\u00f6rt ana eksende incelemek gerekir:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0130\u015flem Y\u00f6n\u00fc: \u015eifreleme \u00e7ift y\u00f6nl\u00fcd\u00fcr; veriyi hem kilitleyebilir hem de anahtarla a\u00e7abilirsiniz. Hash tek y\u00f6nl\u00fcd\u00fcr; kilitlenen veri asla geri a\u00e7\u0131lamaz.<\/li>\n\n<li>Anahtar \u0130htiyac\u0131: \u015eifreleme i\u015fleminin \u00e7al\u0131\u015fmas\u0131 i\u00e7in simetrik ya da asimetrik anahtarlara ihtiya\u00e7 vard\u0131r. Temel hash algoritmalar\u0131 anahtars\u0131z \u00e7al\u0131\u015f\u0131r; sadece girdiye ba\u011fl\u0131 matematiksel i\u015flemler uygular.<\/li>\n\n<li>\u00c7\u0131kt\u0131 Boyutu: \u015eifrelenmi\u015f verinin boyutu, orijinal metnin boyutuna do\u011frudan ba\u011fl\u0131d\u0131r ve genellikle girdiyle orant\u0131l\u0131 olarak b\u00fcy\u00fcr. Hash fonksiyonlar\u0131nda ise girdi 5 baytl\u0131k bir kelime de olsa, 10 gigabaytl\u0131k bir ISO dosyas\u0131 da olsa \u00e7\u0131kt\u0131 boyutu sabittir (\u00f6rne\u011fin SHA-256 her zaman 256 bit \/ 32 bayt \u00fcretir).<\/li>\n\n<li>Kullan\u0131m Amac\u0131: \u015eifreleme verinin gizlili\u011fini korumak i\u00e7in tasarlanm\u0131\u015ft\u0131r. Hash ise verinin b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc (integrity) do\u011frulamak ve kimlik do\u011frulama amac\u0131yla kullan\u0131l\u0131r.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">Hangi Durumda Hangisi Kullan\u0131lmal\u0131d\u0131r?<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Do\u011fru mekanizmay\u0131 se\u00e7mek g\u00fcvenlik mimarisinin temel kural\u0131d\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Parolalar\u0131 Saklarken: Kesinlikle hash kullan\u0131lmal\u0131d\u0131r. Bir veri taban\u0131 sald\u0131rganlar\u0131n eline ge\u00e7ti\u011finde, \u015fifrelenmi\u015f parolalar anahtar ele ge\u00e7irildi\u011fi anda \u00e7\u00f6z\u00fclebilir. Ancak Argon2 veya bcrypt ile tuzlanarak (salt) hash&#8217;lenmi\u015f parolalar\u0131n geri d\u00f6nd\u00fcr\u00fclmesi pratikte m\u00fcmk\u00fcn de\u011fildir.<\/li>\n\n<li>Dosya ve \u0130leti Gizlili\u011finde: Kesinlikle \u015fifreleme kullan\u0131lmal\u0131d\u0131r. Bir arkada\u015f\u0131n\u0131za e-posta veya mesaj g\u00f6nderdi\u011finizde, al\u0131c\u0131n\u0131n metni okuyabilmesi gerekir. Hash tek y\u00f6nl\u00fc oldu\u011fu i\u00e7in kar\u015f\u0131 taraf mesaj\u0131 okuyamaz.<\/li>\n\n<li>Dosya B\u00fct\u00fcnl\u00fc\u011f\u00fc Do\u011frulamas\u0131nda: Hash kullan\u0131lmal\u0131d\u0131r. \u0130ndirdi\u011finiz bir i\u015fletim sistemi kal\u0131b\u0131n\u0131n ya da yaz\u0131l\u0131m paketinin manip\u00fcle edilip edilmedi\u011fini do\u011frulamak i\u00e7in yay\u0131nc\u0131n\u0131n sa\u011flad\u0131\u011f\u0131 SHA-256 kontrol toplam\u0131 (checksum) ile kendi sisteminizde ald\u0131\u011f\u0131n\u0131z hash de\u011feri k\u0131yaslan\u0131r.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Sonu\u00e7 ve Sonraki Ad\u0131mlar<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">\u015eifreleme veriyi gizleyip tekrar okunabilir k\u0131lmay\u0131 hedeflerken, hash fonksiyonlar\u0131 verinin parmak izini \u00e7\u0131kararak b\u00fct\u00fcnl\u00fc\u011f\u00fcn\u00fc kan\u0131tlar. Bu iki kavram birbirinin alternatifi de\u011fil, siber g\u00fcvenlikte farkl\u0131 sorunlar\u0131 \u00e7\u00f6zen iki ayr\u0131lmaz ara\u00e7t\u0131r. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Sisteminizi geli\u015ftirirken parolalar\u0131 asla tersine \u00e7evrilebilir algoritmalarla \u015fifrelemeyin; bunun yerine yava\u015flat\u0131lm\u0131\u015f hash fonksiyonlar\u0131 (Argon2id veya PBKDF2) tercih edin. Bir sonraki a\u015famada, hash fonksiyonlar\u0131na eklenen tuzlama (salt) mekanizmalar\u0131n\u0131 ve g\u00f6kku\u015fa\u011f\u0131 tablolar\u0131na (rainbow tables) kar\u015f\u0131 savunma y\u00f6ntemlerini inceleyebilirsiniz.<\/p>","protected":false},"excerpt":{"rendered":"<p>Kriptografinin iki temel yap\u0131 ta\u015f\u0131 olan \u015fifreleme ve hash kavramlar\u0131n\u0131n farklar\u0131n\u0131, \u00e7al\u0131\u015fma mant\u0131klar\u0131n\u0131 ve do\u011fru kullan\u0131m senaryolar\u0131n\u0131 ele al\u0131yoruz.<\/p>","protected":false},"author":1,"featured_media":10283,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_themeisle_gutenberg_block_has_review":false,"footnotes":""},"categories":[229],"tags":[585,584,11,312,74],"class_list":["post-10282","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-siber-guvenlik","tag-hash","tag-kriptografi","tag-siber-guvenlik","tag-sifreleme","tag-veri-guvenligi"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u015eifreleme ve Hash Fark\u0131 - Yunus KAYTAN<\/title>\n<meta name=\"description\" content=\"Siber g\u00fcvenlikte s\u0131k\u00e7a kar\u0131\u015ft\u0131r\u0131lan hash \u015fifreleme fark\u0131 nedir? 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