{"id":801,"date":"2020-11-01T13:14:35","date_gmt":"2020-11-01T10:14:35","guid":{"rendered":"https:\/\/uzmanposta.com\/blog\/?p=801"},"modified":"2020-11-01T13:14:36","modified_gmt":"2020-11-01T10:14:36","slug":"guvenli-e-posta-iletisimi","status":"publish","type":"post","link":"https:\/\/uzmanposta.com\/blog\/guvenli-e-posta-iletisimi\/","title":{"rendered":"G\u00fcvenli E-posta \u0130leti\u015fimi i\u00e7in Al\u0131nacak \u00d6nlemler"},"content":{"rendered":"\n<p><strong>T.C. Cumhurba\u015fkanl\u0131\u011f\u0131, Dijital D\u00f6n\u00fc\u015f\u00fcm Ofisi <\/strong>taraf\u0131ndan haz\u0131rl\u0131k \u00e7al\u0131\u015fmalar\u0131 tamamlan\u0131p, <strong>24.07.2020 <\/strong>tarihinde onaylanan <strong>Bilgi ve \u0130leti\u015fim G\u00fcvenli\u011fi Rehberi<\/strong> ile bilgi ve ileti\u015fim g\u00fcvenli\u011fi alan\u0131nda yeni ad\u0131mlar at\u0131lm\u0131\u015f ve \u00fclkemizin stratejik \u00f6neme haiz olan t\u00fcm kamu kurum ve kurulu\u015flar\u0131yla birlikte, kritik altyap\u0131 hizmeti sa\u011flayan i\u015fletmelerin uymas\u0131 gereken bilgi ve ileti\u015fim g\u00fcvenli\u011fi tedbirleri saptanm\u0131\u015ft\u0131r.<\/p>\n\n\n\n<p>E-posta g\u00fcvenli\u011fi ile alakal\u0131 olarak, Bilgi ve \u0130leti\u015fim G\u00fcvenli\u011fi Rehberi, 3.1.4.8 tedbir maddesinde ifade edilen;<\/p>\n\n\n\n<p>\u201cSahte ya da b\u00fct\u00fcnl\u00fc\u011f\u00fc bozulmu\u015f e-postalar\u0131n ge\u00e7erli etki alanlar\u0131na s\u0131zma ihtimalini azaltmak i\u00e7in SPF, DKIM vb. teknoloji ve standartlar kullan\u0131lmal\u0131d\u0131r.\u201d<\/p>\n\n\n\n<p>Maddesi uyar\u0131nca, Aselsan taraf\u0131ndan uygulamaya ge\u00e7ilmi\u015f ve Aselsan taraf\u0131ndan yap\u0131lan duyuruda, t\u00fcm payda\u015flar\u0131n 1 Ekim 2020 tarihine kadar, g\u00fcvenli e-posta ak\u0131\u015f\u0131n\u0131n s\u00fcrd\u00fcr\u00fclmesi noktas\u0131nda, gerekli altyap\u0131 \u00e7al\u0131\u015fmalar\u0131n\u0131n yap\u0131lmas\u0131 istenmektedir. Aselsan\u2019\u0131n duyurusunda e-posta haberle\u015fmelerinde, g\u00fcvenli ve sa\u011fl\u0131kl\u0131 ileti\u015fimin sa\u011flanmas\u0131 i\u00e7in alan ad\u0131 sunucular\u0131nda PTR, SPF, DKIM alan ad\u0131 kay\u0131tlar\u0131n\u0131n ve DMARC politikalar\u0131n\u0131n g\u00f6zden ge\u00e7irilmesi ve g\u00fcncellenmesi \u00f6nerilmektedir.<\/p>\n\n\n\n<p>Belirtilen tarihe kadar DNS kay\u0131tlar\u0131nda g\u00fcncelleme ve g\u00f6zden ge\u00e7irme faaliyetlerinin yerine getirmeyen kurumlar ile yap\u0131lacak e-posta g\u00f6nderilerinin Aselsan sunucular\u0131 taraf\u0131ndan <strong>SPAM<\/strong> (\u015e\u00fcpheli) e-posta olarak i\u015faretlenece\u011fi vurgulanm\u0131\u015ft\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">E-Posta G\u00fcvenli\u011fi Neden \u00d6nemlidir?<\/h2>\n\n\n\n<p>\u00dclke \u00e7ap\u0131nda bilgi g\u00fcvenli\u011fi seviyesinin artt\u0131r\u0131lmas\u0131 maksad\u0131yla haz\u0131rlanan ve y\u00fcr\u00fcrl\u00fc\u011fe giren bu esaslar \u00e7er\u00e7evesince, t\u00fcm kamu kurum ve kurulu\u015flar\u0131 ve stratejik \u00f6neme sahip payda\u015flarca t\u00fcm tedbirler ivedilikle uygulamaya konularak, \u00fclkemizin bilgi teknolojisi alt yap\u0131s\u0131 g\u00fcncellenmekte ve haberle\u015fme a\u011flar\u0131n\u0131n g\u00fcvenlik seviyelerinin yeni teknolojilere adapte edilmesi ama\u00e7lanmaktad\u0131r.<\/p>\n\n\n\n<p>Bilginin en b\u00fcy\u00fck g\u00fc\u00e7 oldu\u011fu g\u00fcn\u00fcm\u00fczde, \u00f6zellikle milli g\u00fcvenli\u011fi tehdit edebilecek a\u00e7\u0131klara meydan vermemek, kamu d\u00fczeninin sa\u011fl\u0131kl\u0131 \u015fekilde y\u00fcr\u00fct\u00fclmesi, kritik \u00f6nemdeki verilerin g\u00fcvenli\u011finin sa\u011flanmas\u0131 a\u00e7\u0131s\u0131ndan olduk\u00e7a b\u00fcy\u00fck \u00f6neme sahiptir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">G\u00fcvenli E-Posta Altyap\u0131s\u0131 \u0130\u00e7in Yap\u0131lmas\u0131 Gerekenler Nelerdir?<\/h2>\n\n\n\n<p>E-posta al\u0131m\u0131 ya da g\u00f6nderilerinde, e-postan\u0131n ger\u00e7ek ve do\u011fru bir adresten geldi\u011finin tespiti noktas\u0131nda belirli standartlar kabul edilmektedir. Bilgi ve \u0130leti\u015fim G\u00fcvenli\u011fi Rehberi i\u00e7inde de yer alan DMARC, SPF, PTR ve DKIM standartlar\u0131na uygunluk bu kapsamda belirleyicidir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DMARC Nedir?<\/h2>\n\n\n\n<p><strong>DMARC<\/strong> (Domain-Based Message Authentication, Reporting &amp; Conformance); E-posta kimlik bilgilerinin kontrol\u00fc olarak tan\u0131mlanmaktad\u0131r. Alan ad\u0131n\u0131n do\u011frulanmas\u0131, raporlama ve uygunluk esas\u0131na g\u00f6re hileli e-postalar\u0131n saptanmas\u0131, Phishing (oltalama) ve spam iletilerin saptanmas\u0131nda rol oynar. <strong>DMARC<\/strong>, <strong>SPF<\/strong>, <strong>PTR<\/strong> ve <strong>DKIM<\/strong> olarak tan\u0131mlanan e-posta kimlik do\u011frulama teknolojileri ile ortak \u00e7al\u0131\u015fan protokollerin \u00fcst katman\u0131 olarak ifade edilir.<\/p>\n\n\n\n<p>DMARC kayd\u0131, e-posta g\u00f6ndericisi taraf\u0131ndan ilgili alan ad\u0131n\u0131n domain dns y\u00f6netimi k\u0131sm\u0131ndaki parametrelerin doldurulup, DMARC kural\u0131 olu\u015fturmak i\u00e7in istenen etiket ve de\u011ferlerin girilmesiyle yap\u0131l\u0131r.<\/p>\n\n\n\n<p>DMARC kayd\u0131 yap\u0131lmad\u0131\u011f\u0131nda ya da eksik ve hatal\u0131 olu\u015fturuldu\u011funda g\u00f6nderilen e-postalar spam klas\u00f6r\u00fcne d\u00fc\u015fmektedir. Bu ayn\u0131 zamanda e-postay\u0131 g\u00f6nderen \u015fah\u0131s, kurum ya da i\u015fletmenin g\u00fcvenilirli\u011fini zedelemektedir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">PTR nedir?<\/h2>\n\n\n\n<p>PTR bir DNS kayd\u0131 bi\u00e7imidir. G\u00f6nderici e-posta sunucusuna ait ip adresinin, ana makine ile e\u015fle\u015ftirilmesi mant\u0131\u011f\u0131na dayan\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">PTR Kayd\u0131 Neden \u00d6nemlidir?<\/h2>\n\n\n\n<p>Al\u0131c\u0131 taraf\u0131na iletilen e-postaya ait ip adresinin DNS taramas\u0131 yap\u0131larak, PTR kayd\u0131 sorgulan\u0131r, ip adresinin hangi ana makineye ait oldu\u011fu kontrol edilir. B\u00f6ylece e-postan\u0131n, do\u011fru adresten g\u00f6nderildi\u011fi teyit edilir. \u00d6zellikle spam iletilere kar\u015f\u0131 olduk\u00e7a etkili bir koruma t\u00fcr\u00fcd\u00fcr.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SPF Nedir?<\/h2>\n\n\n\n<p><strong>SPF<\/strong> ( Sender Policy Framework) sahte ve spam e-postalar\u0131n\u0131n saptanmas\u0131nda kullan\u0131lan bir e-posta kimlik do\u011frulama protokol\u00fcd\u00fcr. Yetkilendirilmi\u015f olan e-posta sunucusundan gelen e-postalar\u0131n do\u011frulanmas\u0131 i\u00e7in uygulanan i\u015flemleri i\u00e7erir.<\/p>\n\n\n\n<figure class=\"wp-block-embed-wordpress wp-block-embed is-type-wp-embed is-provider-uzman-posta\"><div class=\"wp-block-embed__wrapper\">\n<blockquote class=\"wp-embedded-content\" data-secret=\"ETNdgypkfJ\"><a href=\"https:\/\/uzmanposta.com\/blog\/spf-kaydi-nedir-nasil-yapilir\/\">SPF (Sender Policy Framework) Kayd\u0131 Nedir, Nas\u0131l Yap\u0131l\u0131r?<\/a><\/blockquote><iframe class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;SPF (Sender Policy Framework) Kayd\u0131 Nedir, Nas\u0131l Yap\u0131l\u0131r?&#8221; &#8212; Blog\" src=\"https:\/\/uzmanposta.com\/blog\/spf-kaydi-nedir-nasil-yapilir\/embed\/#?secret=Ycrtg4Cfjp#?secret=ETNdgypkfJ\" data-secret=\"ETNdgypkfJ\" width=\"500\" height=\"282\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">SPF Kayd\u0131 Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<p>Bir alan ad\u0131 (domain) y\u00f6neticisi taraf\u0131ndan e-posta sunucusuna SPF kayd\u0131 yap\u0131l\u0131r. Bu kay\u0131tta y\u00f6netici taraf\u0131ndan hangi ip adreslerinin g\u00f6nderide bulunaca\u011f\u0131 sisteme tan\u0131t\u0131l\u0131r. G\u00f6nderilen e-posta, al\u0131c\u0131ya ula\u015ft\u0131\u011f\u0131nda, Al\u0131c\u0131 posta sunucusu, gelen e-postan\u0131n ip adresini, SPF kayd\u0131nda tan\u0131mlanan ip adresleriyle kar\u015f\u0131la\u015ft\u0131r\u0131r. E\u015fle\u015ftirme do\u011frulan\u0131rsa i\u015flem ger\u00e7ekle\u015fir. Yetkilendirilmi\u015f ip adresinden gelmedi\u011fi saptan\u0131rsa e-posta engellenir.<\/p>\n\n\n\n<p>SPF Nedir? SPF Kayd\u0131 Nas\u0131l Yap\u0131l\u0131r? Hakk\u0131nda daha geni\u015f bilgi almak i\u00e7in <a href=\"https:\/\/uzmanposta.com\/blog\/spf-kaydi-nedir-nasil-yapilir\/\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>bu yaz\u0131m\u0131za<\/strong><\/a> g\u00f6z atabilirsiniz.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">SPF Kayd\u0131 Neden \u00d6nemlidir?<\/h2>\n\n\n\n<p>SPF kayd\u0131, g\u00f6nderici alan ad\u0131na ait e-postan\u0131n, al\u0131c\u0131 e-posta sunucusuna g\u00fcvenli e-posta olarak i\u015faretlenerek, ba\u015far\u0131l\u0131 bir \u015fekilde ula\u015fmas\u0131n\u0131 sa\u011flamas\u0131 a\u00e7\u0131s\u0131ndan \u00f6nem ta\u015f\u0131maktad\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DKIM Nedir?<\/h2>\n\n\n\n<p><strong>DKIM<\/strong> ( DomainKeys Identified Mail) bir e-postan\u0131n, al\u0131c\u0131 e-posta sunucusu taraf\u0131ndan do\u011frulanmas\u0131n\u0131 sa\u011flayan dijital imza eklenmesi esas\u0131na dayal\u0131 olarak \u00e7al\u0131\u015fan, e-posta kimlik do\u011frulama standartlar\u0131ndan biridir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">DKIM Nas\u0131l \u00c7al\u0131\u015f\u0131r?<\/h2>\n\n\n\n<p>G\u00f6nderici taraf\u0131ndan iletilen e-posta g\u00f6nderisinin ba\u015f\u0131na eklenen dijital imza ile g\u00f6ndericinin kimli\u011fi do\u011frulanmakta ve sahte, spam iletiler tespit edilerek ay\u0131klanmaktad\u0131r. Al\u0131c\u0131 e-posta sunucusu, kendisine iletilen e-postan\u0131n ger\u00e7ek oldu\u011funu ve de\u011fi\u015ftirilmedi\u011fini do\u011frulamak i\u00e7in bu imzay\u0131 kullan\u0131r.<\/p>\n\n\n\n<p><strong>DKIM<\/strong>, g\u00f6nderici adresin, iletilerin, \u015fifreli \u015fekilde imzalamas\u0131 ve al\u0131c\u0131 taraf\u0131ndan gelen iletinin \u015fifresinin \u00e7\u00f6z\u00fclerek do\u011frulanmas\u0131 esas\u0131na g\u00f6re i\u015fler. DKIM kayd\u0131, g\u00f6nderici ve al\u0131c\u0131 sunucuda bulunur. E-postay\u0131 g\u00f6nderen sunucu taraf\u0131nda yap\u0131lan \u015fifreleme ile iletinin ba\u015fl\u0131k ve g\u00f6vde k\u0131sm\u0131 \u015fifrelenir ve imzalan\u0131r. Al\u0131c\u0131 sunucusu kendisine gelen e-postan\u0131n <strong>DKIM<\/strong> imzas\u0131 ta\u015f\u0131d\u0131\u011f\u0131n\u0131 g\u00f6r\u00fcr ve g\u00f6nderen alan ad\u0131n\u0131n <strong>TXT\/DKIM<\/strong> kayd\u0131nda bulunan umumi anahtar\u0131 kullanarak \u015fifrelemeyi \u00e7\u00f6zerek metni orijinal haline \u00e7evirir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Sonu\u00e7 Olarak;<\/h2>\n\n\n\n<p>Siber g\u00fcvenli\u011fin sa\u011flanmas\u0131, kritik ve stratejik verilerin g\u00fcvenli \u015fekilde korunmas\u0131, spam ve hileli e-postalar\u0131n tespit edilmesi noktas\u0131nda, <strong>SPF<\/strong>, <strong>DKIM<\/strong>, <strong>PTR<\/strong> gibi e-posta kimlik do\u011frulama politikalar\u0131n\u0131n ve <strong>DMARC<\/strong> protokol\u00fcn\u00fcn uygulanmas\u0131 b\u00fcy\u00fck \u00f6nem arz etmektedir.<\/p>\n\n\n\n<p>\u201c<strong>Uzman Posta<\/strong>, m\u00fc\u015fterilerinin g\u00fcvenli\u011fini en \u00fcst d\u00fczeyde tutarak, <strong>Bilgi ve \u0130leti\u015fim G\u00fcvenli\u011fi <\/strong>esaslar\u0131na g\u00f6re hareket ederek t\u00fcm e-posta g\u00fcvenlik standartlar\u0131na ve protokollerine uygun \u015fekilde, profesyonel bir yakla\u015f\u0131mla yerli ve milli e-posta sa\u011flay\u0131c\u0131s\u0131 olarak hizmet vermeye devam etmektedir.\u201d<\/p>\n\n\n\n<p><a href=\"https:\/\/uzmanposta.com\/uzmanguard-mx-layer\/\">UzmanGuard MX Layer<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>T.C. Cumhurba\u015fkanl\u0131\u011f\u0131, Dijital D\u00f6n\u00fc\u015f\u00fcm Ofisi taraf\u0131ndan haz\u0131rl\u0131k \u00e7al\u0131\u015fmalar\u0131 tamamlan\u0131p, 24.07.2020 tarihinde onaylanan Bilgi ve \u0130leti\u015fim G\u00fcvenli\u011fi Rehberi ile bilgi ve ileti\u015fim g\u00fcvenli\u011fi alan\u0131nda yeni ad\u0131mlar at\u0131lm\u0131\u015f ve \u00fclkemizin stratejik \u00f6neme haiz olan t\u00fcm kamu kurum ve kurulu\u015flar\u0131yla birlikte, kritik altyap\u0131 hizmeti sa\u011flayan i\u015fletmelerin uymas\u0131 gereken bilgi ve ileti\u015fim g\u00fcvenli\u011fi tedbirleri saptanm\u0131\u015ft\u0131r. E-posta g\u00fcvenli\u011fi ile alakal\u0131 [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":802,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[86],"tags":[],"class_list":["post-801","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-guvenlik"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>G\u00fcvenli E-posta \u0130leti\u015fimi i\u00e7in Al\u0131nacak \u00d6nlemler - Uzman Posta<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/uzmanposta.com\/blog\/guvenli-e-posta-iletisimi\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"G\u00fcvenli E-posta \u0130leti\u015fimi i\u00e7in Al\u0131nacak \u00d6nlemler - Uzman Posta\" \/>\n<meta property=\"og:description\" content=\"T.C. Cumhurba\u015fkanl\u0131\u011f\u0131, Dijital D\u00f6n\u00fc\u015f\u00fcm Ofisi taraf\u0131ndan haz\u0131rl\u0131k \u00e7al\u0131\u015fmalar\u0131 tamamlan\u0131p, 24.07.2020 tarihinde onaylanan Bilgi ve \u0130leti\u015fim G\u00fcvenli\u011fi Rehberi ile bilgi ve ileti\u015fim g\u00fcvenli\u011fi alan\u0131nda yeni ad\u0131mlar at\u0131lm\u0131\u015f ve \u00fclkemizin stratejik \u00f6neme haiz olan t\u00fcm kamu kurum ve kurulu\u015flar\u0131yla birlikte, kritik altyap\u0131 hizmeti sa\u011flayan i\u015fletmelerin uymas\u0131 gereken bilgi ve ileti\u015fim g\u00fcvenli\u011fi tedbirleri saptanm\u0131\u015ft\u0131r. 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Cumhurba\u015fkanl\u0131\u011f\u0131, Dijital D\u00f6n\u00fc\u015f\u00fcm Ofisi taraf\u0131ndan haz\u0131rl\u0131k \u00e7al\u0131\u015fmalar\u0131 tamamlan\u0131p, 24.07.2020 tarihinde onaylanan Bilgi ve \u0130leti\u015fim G\u00fcvenli\u011fi Rehberi ile bilgi ve ileti\u015fim g\u00fcvenli\u011fi alan\u0131nda yeni ad\u0131mlar at\u0131lm\u0131\u015f ve \u00fclkemizin stratejik \u00f6neme haiz olan t\u00fcm kamu kurum ve kurulu\u015flar\u0131yla birlikte, kritik altyap\u0131 hizmeti sa\u011flayan i\u015fletmelerin uymas\u0131 gereken bilgi ve ileti\u015fim g\u00fcvenli\u011fi tedbirleri saptanm\u0131\u015ft\u0131r. 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