{"id":149,"date":"2025-11-21T08:32:09","date_gmt":"2025-11-21T08:32:09","guid":{"rendered":"https:\/\/www.aliburaksan.com\/blog\/?p=149"},"modified":"2026-05-26T20:00:51","modified_gmt":"2026-05-26T20:00:51","slug":"siber-guvenlik-nedir-onemi","status":"publish","type":"post","link":"https:\/\/www.aliburaksan.com\/blog\/siber-guvenlik-nedir-onemi\/","title":{"rendered":"Siber G\u00fcvenlik Nedir ve Neden \u00d6nemli?"},"content":{"rendered":"

E-posta kutunuza gelen \u015f\u00fcpheli “\u00f6d\u00fcl kazand\u0131n\u0131z” mesajlar\u0131, bilgisayar\u0131n aniden yava\u015flamas\u0131, banka hesab\u0131nda tuhaf bir i\u015flem… Bunlar\u0131n hepsi siber g\u00fcvenli\u011fin g\u00fcnl\u00fck hayattaki yans\u0131malar\u0131. \u00c7al\u0131\u015ft\u0131\u011f\u0131m kurumsal ortamda bu durumlarla do\u011frudan muhatap oluyorum \u2014 ve \u015funu net s\u00f6yleyebilirim: siber g\u00fcvenlik art\u0131k sadece b\u00fcy\u00fck \u015firketlerin teknik meselesi de\u011fil, hepimizin ortak sorunu.<\/p>\n

Bu yaz\u0131da siber g\u00fcvenli\u011fin temellerini, yayg\u0131n tehdit t\u00fcrlerini ve hem ki\u015fisel hem kurumsal d\u00fczeyde al\u0131nabilecek pratik \u00f6nlemleri aktaraca\u011f\u0131m.<\/p>\n

Siber g\u00fcvenlik nedir?<\/h2>\n

En basit tan\u0131m\u0131yla: internete ba\u011fl\u0131 sistemleri, a\u011flar\u0131 ve verileri dijital sald\u0131r\u0131lardan koruma prati\u011fi. Bu sald\u0131r\u0131lar\u0131n amac\u0131 genellikle veriye eri\u015fmek, de\u011fi\u015ftirmek veya yok etmek; kullan\u0131c\u0131lar\u0131 maddi zarara u\u011fratmak ya da sistemleri i\u015flevsiz k\u0131lmak. Kimlik h\u0131rs\u0131zl\u0131\u011f\u0131, finansal kay\u0131p, itibar zedelenmesi \u2014 bunlar\u0131n hepsi siber g\u00fcvenlik zafiyetinin sonu\u00e7lar\u0131.<\/p>\n

\n

CIA \u00fc\u00e7l\u00fcs\u00fc: g\u00fcvenli\u011fin \u00fc\u00e7 temel prensibi<\/h2>\n

Siber g\u00fcvenli\u011fin \u00fczerine in\u015fa edildi\u011fi \u00fc\u00e7 temel prensip var. Bunlara “CIA \u00fc\u00e7l\u00fcs\u00fc” deniyor \u2014 Gizlilik, B\u00fct\u00fcnl\u00fck ve Eri\u015filebilirlik.<\/p>\n

Gizlilik (Confidentiality)<\/h3>\n

Yetkisiz ki\u015filerin hassas bilgilere eri\u015fimini engellemek. E-posta \u015fifreniz, banka bilgileriniz, \u015firketin gizli projeleri \u2014 bunlara sadece yetkili ki\u015filer ula\u015fabilmeli. \u015eifreleme ve eri\u015fim kontrolleri bu prensibin temel ara\u00e7lar\u0131.<\/p>\n

B\u00fct\u00fcnl\u00fck (Integrity)<\/h3>\n

Verinin do\u011fru ve tam kalmas\u0131, yetkisiz de\u011fi\u015ftirilmemesi. Bir dosyan\u0131n olu\u015fturuldu\u011fu haliyle kalmas\u0131, \u00fczerinde oynanmamas\u0131. Hash de\u011ferleri ve dijital imzalar bunu sa\u011flamak i\u00e7in kullan\u0131l\u0131r.<\/p>\n

Eri\u015filebilirlik (Availability)<\/h3>\n

Yetkili kullan\u0131c\u0131lar\u0131n ihtiya\u00e7 duyduklar\u0131 zaman sistemlere ve verilere ula\u015fabilmesi. DDoS sald\u0131r\u0131lar\u0131 tam olarak bu prensibi hedef al\u0131r \u2014 sistemi a\u015f\u0131r\u0131 trafikle bo\u011farak eri\u015filemez hale getirir.<\/p>\n

\n

Yayg\u0131n sald\u0131r\u0131 t\u00fcrleri<\/h2>\n

Kimlik av\u0131 (Phishing)<\/h3>\n

G\u00fcvenilir bir kaynaktan geliyormu\u015f gibi g\u00f6r\u00fcnen sahte e-postalar veya mesajlarla ki\u015fisel bilgileri \u00e7almaya y\u00f6nelik sald\u0131r\u0131lar. \u00c7al\u0131\u015ft\u0131\u011f\u0131m kurumda siber g\u00fcvenlik ekibi zaman zaman t\u00fcm \u00e7al\u0131\u015fanlara \u2014 y\u00f6neticiler dahil \u2014 sim\u00fcle phishing testleri uyguluyor. Her seferinde bir k\u0131s\u0131m ki\u015fi testi ge\u00e7emiyor. Bu y\u00f6ntemi ve yapay zeka destekli phishing sald\u0131r\u0131lar\u0131n\u0131n nas\u0131l \u00e7ok daha ikna edici hale geldi\u011fini ayr\u0131 bir yaz\u0131da<\/a> ayr\u0131nt\u0131l\u0131 ele ald\u0131m.<\/p>\n

K\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131mlar (Malware)<\/h3>\n

Vir\u00fcsler, Truva atlar\u0131, fidye yaz\u0131l\u0131mlar\u0131, casus yaz\u0131l\u0131mlar… Sisteme s\u0131zarak veri \u00e7alan, bozan veya kilitleyen yaz\u0131l\u0131mlar. \u00d6zellikle fidye yaz\u0131l\u0131mlar\u0131 (ransomware) son y\u0131llarda hem bireyler hem kurumlar i\u00e7in ciddi bir tehdit haline geldi.<\/p>\n

DDoS sald\u0131r\u0131lar\u0131<\/h3>\n

Sistemi a\u015f\u0131r\u0131 trafikle bo\u011farak normal kullan\u0131c\u0131lar\u0131n hizmete eri\u015fimini engellemek. E-ticaret siteleri ve kritik altyap\u0131lar i\u00e7in y\u0131k\u0131c\u0131 sonu\u00e7lar\u0131 olabiliyor.<\/p>\n

S\u0131f\u0131r g\u00fcn (Zero-Day) a\u00e7\u0131klar\u0131<\/h3>\n

Yaz\u0131l\u0131m \u00fcreticileri taraf\u0131ndan hen\u00fcz ke\u015ffedilmemi\u015f veya yamas\u0131 \u00e7\u0131kmam\u0131\u015f g\u00fcvenlik zafiyetleri. Savunma mekanizmalar\u0131 bu sald\u0131r\u0131 tipini tan\u0131mad\u0131\u011f\u0131 i\u00e7in en tehlikeli kategoride yer al\u0131yor.<\/p>\n

\n

Temel savunma ara\u00e7lar\u0131<\/h2>\n
    \n
  • G\u00fcvenlik duvar\u0131 (Firewall):<\/strong> A\u011f trafi\u011fini izler, kurallara g\u00f6re izin verir veya engeller.<\/li>\n
  • Antivir\u00fcs \/ EDR:<\/strong> K\u00f6t\u00fc ama\u00e7l\u0131 yaz\u0131l\u0131mlar\u0131 tespit eder, karantinaya al\u0131r. EDR \u00e7\u00f6z\u00fcmleri geleneksel antivir\u00fcse g\u00f6re \u00e7ok daha proaktif koruma sa\u011flar.<\/li>\n
  • \u015eifreleme:<\/strong> Veriyi okunamaz hale getirir. Hem aktar\u0131m s\u0131ras\u0131nda hem depolamada kritik.<\/li>\n
  • Yama y\u00f6netimi:<\/strong> Sistemleri ve uygulamalar\u0131 g\u00fcncel tutmak. Basit ama son derece etkili.<\/li>\n
  • \u00c7ok fakt\u00f6rl\u00fc do\u011frulama (MFA):<\/strong> \u015eifre \u00e7al\u0131nsa bile ikinci fakt\u00f6r olmadan eri\u015fim engellenir.<\/li>\n<\/ul>\n
    \n

    A\u011f durumunu kontrol etmek: pratik komutlar<\/h2>\n

    IT ortam\u0131nda hangi ba\u011flant\u0131lar\u0131n aktif oldu\u011funu bilmek, \u015f\u00fcpheli trafi\u011fi erken fark etmek i\u00e7in \u00f6nemli. S\u0131k kullan\u0131lan iki komut:<\/p>\n

    Windows<\/h3>\n
    netstat -ano<\/code><\/pre>\n
    Aktif t\u00fcm ba\u011flant\u0131lar\u0131, dinleme durumundaki portlar\u0131 ve bunlar\u0131 kullanan i\u015flem kimliklerini (PID) g\u00f6sterir. “LISTEN” durumundaki tan\u0131mad\u0131\u011f\u0131n\u0131z portlara dikkat edin.<\/p>\n
    Linux \/ macOS<\/h3>\n
    sudo lsof -i -P -n | grep LISTEN<\/code><\/pre>\n
    Sistemde dinleme durumundaki t\u00fcm a\u011f servislerini ve kulland\u0131klar\u0131 port numaralar\u0131n\u0131 listeler. Tan\u0131mad\u0131\u011f\u0131n\u0131z bir servisin dinlemede olmas\u0131 potansiyel bir risk i\u015fareti.<\/p>\n
    \n
    Ki\u015fisel d\u00fczeyde pratik ad\u0131mlar<\/h2>\n
      \n
    • G\u00fc\u00e7l\u00fc ve benzersiz \u015fifreler kullan\u0131n.<\/strong> Her hesap i\u00e7in farkl\u0131, en az 12 karakterlik \u015fifreler. Parola y\u00f6neticisi (Bitwarden, LastPass) bu i\u015fi kolayla\u015ft\u0131r\u0131r.<\/li>\n
    • MFA’y\u0131 aktif edin.<\/strong> Banka, e-posta, sosyal medya \u2014 hepsinde. \u015eifreniz \u00e7al\u0131nsa bile ikinci fakt\u00f6r olmadan giri\u015f yap\u0131lamaz.<\/li>\n
    • G\u00fcncellemeleri ertelemeyin.<\/strong> Ertelenen g\u00fcncellemeler bilinen a\u00e7\u0131klar\u0131 a\u00e7\u0131k b\u0131rak\u0131r. Bir\u00e7ok fidye yaz\u0131l\u0131m\u0131 tam da bu a\u00e7\u0131klardan s\u0131z\u0131yor.<\/li>\n
    • Yedekleme yap\u0131n.<\/strong> Harici disk veya bulut (Google Drive, OneDrive). Fidye yaz\u0131l\u0131m\u0131 sald\u0131r\u0131s\u0131nda tek g\u00fcvenceniz yedek.<\/li>\n
    • \u015e\u00fcpheli e-postalara dikkat edin.<\/strong> Linke t\u0131klamadan \u00f6nce g\u00f6ndericiyi ve URL’yi kontrol edin. Aciliyet hissi yaratan mesajlara kar\u015f\u0131 her zaman temkinli olun.<\/li>\n<\/ul>\n
      \n⚠ S\u0131k yap\u0131lan hatalar:<\/strong> Ayn\u0131 \u015fifreyi birden fazla yerde kullanmak, g\u00fcncellemeleri ihmal etmek, yedek almamak ve “bana bir \u015fey olmaz” mentalitesi \u2014 bunlar siber g\u00fcvenlik ihlallerinin en yayg\u0131n tetikleyicileri. \u00d6zellikle varsay\u0131lan modem ve y\u00f6nlendirici \u015fifrelerini de\u011fi\u015ftirmemek kolay bir hedef haline getiriyor.\n<\/p><\/blockquote>\n
      Kurumsal d\u00fczeyde ba\u015flang\u0131\u00e7 noktalar\u0131<\/h2>\n
        \n
      • \u00c7al\u0131\u015fan e\u011fitimi:<\/strong> En g\u00fc\u00e7l\u00fc savunma hatt\u0131 insan fakt\u00f6r\u00fc. D\u00fczenli fark\u0131ndal\u0131k e\u011fitimleri ve sim\u00fcle phishing testleri \u00e7al\u0131\u015fanlar\u0131n reflekslerini geli\u015ftiriyor.<\/li>\n
      • En az ayr\u0131cal\u0131k prensibi:<\/strong> \u00c7al\u0131\u015fanlara sadece i\u015fleri i\u00e7in gerekli eri\u015fim yetkisi verin. Fazla yetki, potansiyel risk.<\/li>\n
      • A\u011f segmentasyonu:<\/strong> \u015eirket a\u011f\u0131n\u0131 mant\u0131ksal b\u00f6l\u00fcmlere ay\u0131r\u0131n. Bir b\u00f6l\u00fcmde ihlal olursa di\u011ferlerine yay\u0131lmas\u0131n\u0131 \u00f6nler.<\/li>\n<\/ul>\n
        \n💡 \u0130pucu:<\/strong> Siber g\u00fcvenlik tek seferlik bir kurulum de\u011fil, s\u00fcrekli devam eden bir s\u00fcre\u00e7. Yeni tehditler \u00e7\u0131kt\u0131k\u00e7a savunma y\u00f6ntemleri de g\u00fcncellenmeli. Proaktif olmak, reaktif olmaktan her zaman daha az maliyetli.\n<\/p><\/blockquote>\n
        Sonu\u00e7<\/h2>\n
        G\u00fc\u00e7l\u00fc \u015fifreler, MFA, g\u00fcncel yaz\u0131l\u0131mlar ve fark\u0131ndal\u0131k \u2014 bu d\u00f6rt temel ad\u0131m b\u00fcy\u00fck \u00e7o\u011funlu\u011fu korur. Siber g\u00fcvenlik bir k\u00fclt\u00fcr meselesi; teknik \u00f6nlemler ne kadar iyi olursa olsun, insan fakt\u00f6r\u00fc g\u00f6z ard\u0131 edilirse zay\u0131f halka oras\u0131 olur. Hem ki\u015fisel hem kurumsal d\u00fczeyde bu bilinci olu\u015fturmak, dijital ortamda en temel savunma hatt\u0131n\u0131 kurmak demek.<\/p>\n","protected":false},"excerpt":{"rendered":"
        CIA \u00fc\u00e7l\u00fcs\u00fcnden pratik komutlara: Siber g\u00fcvenli\u011fin temelleri, yayg\u0131n sald\u0131r\u0131 t\u00fcrleri ve ki\u015fisel-kurumsal d\u00fczeyde al\u0131nabilecek \u00f6nlemler.<\/p>\n","protected":false},"author":1,"featured_media":382,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[18,11,17],"class_list":["post-149","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-siber-guvenlik-istihbarat","tag-cyber-security","tag-firewall","tag-siber-guvenlik"],"blocksy_meta":[],"yoast_head":"\nSiber G\u00fcvenlik Nedir ve Neden \u00d6nemli? - AB\u015e<\/title>\n<meta name=\"description\" content=\"CIA \u00fc\u00e7l\u00fcs\u00fcnden pratik komutlara: IT uzman\u0131n\u0131n g\u00f6z\u00fcnden siber g\u00fcvenli\u011fin temelleri, yayg\u0131n sald\u0131r\u0131 t\u00fcrleri ve ki\u015fisel-kurumsal d\u00fczeyde al\u0131nabilecek \u00f6nlemler.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.aliburaksan.com\/blog\/siber-guvenlik-nedir-onemi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Siber G\u00fcvenlik Nedir ve Neden \u00d6nemli? 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