{"id":13955,"date":"2025-02-26T03:00:00","date_gmt":"2025-02-26T08:00:00","guid":{"rendered":"https:\/\/www.cscdbs.com\/blog\/?p=13955"},"modified":"2025-02-25T11:40:17","modified_gmt":"2025-02-25T16:40:17","slug":"betydelsen-av-dkim-spf-och-dmarc-for-foretags-e-postsakerhet","status":"publish","type":"post","link":"https:\/\/www.cscdbs.com\/blog\/betydelsen-av-dkim-spf-och-dmarc-for-foretags-e-postsakerhet\/","title":{"rendered":"Betydelsen av DKIM, SPF och DMARC f\u00f6r f\u00f6retags e-posts\u00e4kerhet"},"content":{"rendered":"\n<p>E-post \u00e4r ett av de vanligaste kommunikationsverktygen i n\u00e4ringslivet och ocks\u00e5 ett vanligt m\u00e5l f\u00f6r cyberkriminella. Phishing, Spoofing och ID-kapning \u00f6kar och \u00e4r ett hot mot k\u00e4nsliga uppgifter, varum\u00e4rkesv\u00e4rden och kunders f\u00f6rtroende. F\u00f6r att bek\u00e4mpa de h\u00e4r riskerna anv\u00e4nder sig f\u00f6retagen av flera viktiga metoder f\u00f6r att f\u00f6rb\u00e4ttra e-posts\u00e4kerheten:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Sender policy framework (SPF).<\/li>\n\n\n\n<li>DomainKeys identified mail (DKIM).<\/li>\n\n\n\n<li>Domain-based message authentication, reporting, and conformance (DMARC).<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Vad \u00e4r SPF, DKIM och DMARC?<\/strong><\/h2>\n\n\n\n<p><strong>SPF<\/strong> \u00e4r ett ramverk f\u00f6r e-postvalidering som verifierar att ett e-mail kommer fr\u00e5n en auktoriserad e-postserver. Mottagaren publicerar en lista \u00f6ver godk\u00e4nda s\u00e4ndarservrar i sina DNS-records (Domain Name System). N\u00e4r ett e-postmeddelande tas emot kontrollerar mottagarens server avs\u00e4ndarens IP-adress (internetprotokoll) mot SPF-posten. Om de \u00f6verensst\u00e4mmer anses e-postmeddelandet vara legitimt.<\/p>\n\n\n\n<p><strong>DKIM<\/strong> s\u00e4kerst\u00e4ller att ett e-mail inte har manipulerats under s\u00e4ndning. DKIM anv\u00e4nder kryptografiska signaturer f\u00f6r att verifiera e-postmeddelandets integritet. Avs\u00e4ndarens e-postserver l\u00e4gger till en digital \u201dsignatur\u201d i utg\u00e5ende e-postmeddelanden och mottagarens server anv\u00e4nder den publika nyckeln (som finns lagrad i avs\u00e4ndarens DNS-record) f\u00f6r att certifiera signaturen och bekr\u00e4fta meddelandets integritet.<\/p>\n\n\n\n<p><strong>DMARC<\/strong> bygger vidare p\u00e5 SPF och DKIM genom att l\u00e4gga till ytterligare en policyniv\u00e5. Det g\u00f6r det m\u00f6jligt f\u00f6r dom\u00e4ninnehavare att best\u00e4mma hur e-postservrarna ska hantera meddelanden som inte godk\u00e4nns vid SPF- eller DKIM-kontroller, till exempel om de ska avvisa, placera i karant\u00e4n eller till\u00e5ta e-postmeddelandet. DMARC tillhandah\u00e5ller ocks\u00e5 rapporteringsfunktioner som ger dom\u00e4ninnehavare insyn i autentiseringen av e-postmeddelandena.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Hur fungerar SPF, DKIM och DMARC?<\/strong><\/h2>\n\n\n\n<p>SPF och DKIM \u00e4r grundl\u00e4ggande standarder f\u00f6r att validera k\u00e4lla och integritet i ett e-mail. I ett SPF-arbetsfl\u00f6de definierar avs\u00e4ndaren en lista \u00f6ver godk\u00e4nda e-postservrar i DNS-posten. Den mottagande servern kontrollerar om avs\u00e4ndarens IP st\u00e4mmer \u00f6verens med den godk\u00e4nda listan. Med DKIM signeras utg\u00e5ende e-mail med en privat nyckel. Den mottagande servern anv\u00e4nder den publika nyckeln i avs\u00e4ndarens DNS-post f\u00f6r att verifiera e-postmeddelandets integritet.<\/p>\n\n\n\n<p>DMARC knyter samman de tv\u00e5 protokollen, s\u00e4kerst\u00e4ller konsekvent autentisering och g\u00f6r det m\u00f6jligt f\u00f6r dom\u00e4ninnehavare att till\u00e4mpa policies f\u00f6r icke-godk\u00e4nda e-postmeddelanden. I en DMARC-konfiguration publicerar avs\u00e4ndaren en policy i sin DNS-records (t.ex. att de e-postmeddelanden som inte godk\u00e4nns genom SPF eller DKIM ska avvisas eller placeras i karant\u00e4n). Den mottagande servern till\u00e4mpar den h\u00e4r policyn och genererar rapporter som hj\u00e4lper till att f\u00f6rb\u00e4ttra s\u00e4kerhetsstrategier.<\/p>\n\n\n\n<p>De h\u00e4r \u00e5tg\u00e4rderna skapar tillsammans en strategi i flera niv\u00e5er som skyddar e-postmeddelanden mot olika hot.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Vilka risker online minskas med dessa \u00e5tg\u00e4rder?<\/strong><\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Phishing och spoofing<\/strong>: Genom att kontrollera e-postavs\u00e4ndarnas giltighet hj\u00e4lper de h\u00e4r protokollen till att f\u00f6rhindra att din dom\u00e4n p\u00e5 obeh\u00f6rig v\u00e4g anv\u00e4nds f\u00f6r att lura mottagare av e-post.<\/li>\n\n\n\n<li><strong>E-postmanipulering<\/strong>: DKIM skyddar meddelanden mot att \u00e4ndras under \u00f6verf\u00f6ringen, vilket skyddar k\u00e4nslig kommunikation.<\/li>\n\n\n\n<li><strong>Varum\u00e4rkesimitation<\/strong>: DMARC minskar risken f\u00f6r att falska e-mail skadar din organisations rykte och trov\u00e4rdighet.<\/li>\n<\/ul>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Anv\u00e4ndningstrender f\u00f6r DMARC, SPF och DKIM<\/strong><\/h2>\n\n\n\n<p>I v\u00e5r <a href=\"https:\/\/www.cscdbs.com\/en\/resources-news\/domain-security-report\/\">dom\u00e4ns\u00e4kerhetsrapport 2024<\/a> analyserade vi dom\u00e4ns\u00e4kerhetsrutiner p\u00e5 f\u00f6retag som \u00e4r med i Forbes Global 2000-lista och utv\u00e4rderade om kritiska skydds\u00e5tg\u00e4rder hade implementerats. N\u00e5gra av \u00e5tg\u00e4rderna var till exempel <a href=\"https:\/\/www.cscdbs.com\/blog\/att-forsta-dns-redundans-varfor-det-ar-viktigt-for-cybersakerhet-och-varumarkesskydd-pa-natet\/\">DNS-redundans<\/a> och <a href=\"https:\/\/www.cscdbs.com\/blog\/en-grundlaggande-oversikt-av-dnssec\/\">dom\u00e4nnamnss\u00e4kerhetstill\u00e4gg (DNSSEC)<\/a>.<\/p>\n\n\n\n<p>Huvudpunkterna i rapporten:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>DMARC<\/strong>: Anv\u00e4ndningen har \u00f6kat kraftigt och 70,6 % av Global 2000-f\u00f6retagen har implementerat detta. Det \u00e4r en kraftig \u00f6kning fr\u00e5n 38,9 % \u00e5r 2020, vilket g\u00f6r det till den mest anv\u00e4nda \u00e5tg\u00e4rden i rapporten.<\/li>\n\n\n\n<li><strong>SPF<\/strong>: 90,2 % av f\u00f6retagen anv\u00e4nder SPF f\u00f6r att autentisera e-postdom\u00e4ner.<\/li>\n\n\n\n<li><strong>DKIM<\/strong>: Trots sin betydelse anv\u00e4nds DKIM fortfarande i l\u00e5g utstr\u00e4ckning, och endast 12,0 % av f\u00f6retagen anv\u00e4nder det f\u00f6r att skydda sin e-postkommunikation.<\/li>\n<\/ul>\n\n\n\n<p>Uppgifterna visar p\u00e5 en \u00f6kad medvetenhet om vissa s\u00e4kerhetsmetoder f\u00f6r e-post men avsl\u00f6jar ocks\u00e5 att s\u00e5rbarheter kvarst\u00e5r. N\u00e4stan 30 % av de st\u00f6rre f\u00f6retagen saknar fortfarande DMARC och DKIM-anv\u00e4ndningen forts\u00e4tter att sl\u00e4pa efter vilket g\u00f6r att m\u00e5nga organisationer \u00e4r s\u00e5rbara f\u00f6r hot som phishing, spoofing och manipulering.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>F\u00f6rb\u00e4ttra din dom\u00e4ns\u00e4kerhet<\/strong><\/h2>\n\n\n\n<p>En os\u00e4krad e-postinfrastruktur uts\u00e4tter din organisation f\u00f6r kostsamma intr\u00e5ng, skadat rykte och minskat kundf\u00f6rtroende. Dom\u00e4ns\u00e4kerhet str\u00e4cker sig l\u00e4ngre \u00e4n e-post eftersom det omfattar ett invecklat ekosystem i flera niv\u00e5er med olika potentiella ing\u00e5ngar f\u00f6r hotakt\u00f6rer. L\u00e4s om hur vi <a href=\"https:\/\/www.cscdbs.com\/en\/resources-news\/domain-security-report\/\">m\u00e4tte niv\u00e5n p\u00e5 dom\u00e4ns\u00e4kerhets\u00e5tg\u00e4rderna<\/a> hos de f\u00f6retag som finns med p\u00e5 Forbes Global 2000-listan \u2013 och se hur din organisation ligger till.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>E-post \u00e4r ett av de vanligaste kommunikationsverktygen i n\u00e4ringslivet och ocks\u00e5 ett vanligt m\u00e5l f\u00f6r cyberkriminella. Phishing, Spoofing och ID-kapning \u00f6kar och \u00e4r ett hot mot k\u00e4nsliga uppgifter, varum\u00e4rkesv\u00e4rden och kunders f\u00f6rtroende. F\u00f6r att bek\u00e4mpa de h\u00e4r riskerna anv\u00e4nder sig f\u00f6retagen av flera viktiga metoder f\u00f6r att f\u00f6rb\u00e4ttra e-posts\u00e4kerheten: Vad \u00e4r SPF, DKIM och DMARC? [&hellip;]<\/p>\n","protected":false},"author":13,"featured_media":10442,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[546],"tags":[],"class_list":["post-13955","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-se"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Betydelsen av DKIM, SPF och DMARC f\u00f6r f\u00f6retags e-posts\u00e4kerhet | CSC<\/title>\n<meta name=\"description\" content=\"E-post \u00e4r ett av de vanligaste kommunikationsverktygen i n\u00e4ringslivet och ocks\u00e5 ett vanligt m\u00e5l f\u00f6r cyberkriminella. 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