[{"data":1,"prerenderedAt":561},["ShallowReactive",2],{"sc:header-data-da":3,"sc:footer-data-da":102,"glossary-da--glossary-cryptography":140,"authors_data":477},{"lang":4,"home":5,"navigation":14,"contact":95},"en",{"name":6,"imgLight":7,"img":8,"languages":9},"home","/products/scepman/scepman-logo-all-white.svg","/products/scepman/scepman-logo-rgb.svg",{"da":10},{"title":11,"url":12,"alt":13},"Forside","/da","SCEPman",[15,19,25,31,83,89],{"name":16,"languages":17},"nav-home",{"da":18},{"title":11,"url":12},{"name":20,"languages":21},"pricing",{"da":22},{"title":23,"url":24},"Priser","/da/pricing",{"name":26,"languages":27},"partner",{"da":28},{"title":29,"url":30},"Partnere","/da/partner",{"name":32,"languages":33,"children":36},"support-hub",{"da":34},{"title":35},"Support 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adresser",{"id":141,"title":142,"author":143,"body":144,"cta":143,"description":435,"eventid":143,"extension":458,"hideInRecent":101,"layout":459,"meta":460,"moment":143,"navigation":472,"path":473,"seo":474,"stem":475,"tags":143,"webcast":101,"__hash__":476},"content_da/glossary/cryptography.md","Kryptografi",null,{"type":145,"value":146,"toc":434},"minimal",[147,152,164,171,199,205,227,231,234,237,246,249,257,296,300,303,307,310,314,317,321,324,327,331,335,338,364,368,371,388,392,395,399,402,406,409,414],[148,149,151],"h2",{"id":150},"hvilke-to-typer-nøglebaseret-kryptering-findes-der","Hvilke to typer nøglebaseret kryptering findes der?",[153,154,155,156,160,161],"p",{},"De to hovedtyper af nøglebaseret kryptering er ",[157,158,159],"strong",{},"symmetrisk kryptering"," og ",[157,162,163],{},"asymmetrisk kryptering.",[165,166,168],"h3",{"id":167},"symmetrisk-kryptering",[157,169,170],{},"Symmetrisk kryptering",[172,173,174,181,187,193],"ul",{},[175,176,177,180],"li",{},[157,178,179],{},"Brug af nøgler",": Bruger en enkelt nøgle til både kryptering og dekryptering.",[175,182,183,186],{},[157,184,185],{},"Hastighed",": Generelt hurtigere og mere effektiv.",[175,188,189,192],{},[157,190,191],{},"Sikkerhed",": Den største udfordring er at dele nøglen sikkert mellem parterne.",[175,194,195,198],{},[157,196,197],{},"Eksempler",": AES (Advanced Encryption Standard), DES (Data Encryption Standard).",[165,200,202],{"id":201},"asymmetrisk-kryptering",[157,203,204],{},"Asymmetrisk kryptering",[172,206,207,212,217,222],{},[175,208,209,211],{},[157,210,179],{},": Bruger et nøglepar, nemlig en offentlig nøgle til kryptering og en privat nøgle til dekryptering.",[175,213,214,216],{},[157,215,185],{},": Langsommere end symmetrisk kryptering, fordi beregningerne er mere komplekse.",[175,218,219,221],{},[157,220,191],{},": Mere sikker ved distribution af nøgler, fordi den private nøgle aldrig deles.",[175,223,224,226],{},[157,225,197],{},": RSA (Rivest-Shamir-Adleman), ECC (Elliptic Curve Cryptography).",[165,228,230],{"id":229},"hvilken-type-kryptering-anses-for-mest-sikker","Hvilken type kryptering anses for mest sikker?",[153,232,233],{},"Begge metoder betragtes som sikre i den forstand, at ingen nuværende computer kan bryde krypteringen, hvis du bruger en moderne algoritme med tilstrækkelig nøglelængde.",[153,235,236],{},"Hvilken type kryptering der er bedst, afhænger af anvendelsen, men mange anvendelser kræver asymmetrisk kryptering, fordi den bruger et nøglepar: en offentlig nøgle til kryptering og en privat nøgle til dekryptering. Den private nøgle holdes hemmelig, og det styrker sikkerheden, fordi den aldrig skal deles.",[165,238,240,241],{"id":239},"hvilken-type-kryptering-er-bedst-til-store-datamængder","Hvilken type kryptering er bedst til store datamængder? ",[242,243],"a",{"href":244,"id":245},"#which-type-of-encryption-is-better-for-bulk-data","which-type-of-encryption-is-better-for-bulk-data",[153,247,248],{},"Symmetrisk kryptering, fordi den er hurtigere.",[165,250,252,253],{"id":251},"hvordan-foregår-hybrid-kryptering-overordnet","Hvordan foregår hybrid kryptering overordnet? ",[242,254],{"href":255,"id":256},"#what-is-the-general-process-for-hybrid-encryption","what-is-the-general-process-for-hybrid-encryption",[258,259,260,266,272,278,284,290],"ol",{},[175,261,262,265],{},[157,263,264],{},"Nøglegenerering",": Afsenderen genererer en ny symmetrisk nøgle (også kaldet en sessionsnøgle) til at kryptere selve beskeden.",[175,267,268,271],{},[157,269,270],{},"Kryptering af beskeden",": Afsenderen bruger den symmetriske nøgle til at kryptere klartekstbeskeden, hvilket giver en chiffertekst.",[175,273,274,277],{},[157,275,276],{},"Kryptering af nøglen",": Derefter krypterer afsenderen den symmetriske nøgle med modtagerens offentlige nøgle (asymmetrisk kryptering).",[175,279,280,283],{},[157,281,282],{},"Overførsel",": Afsenderen sender både den krypterede besked (chifferteksten) og den krypterede symmetriske nøgle til modtageren.",[175,285,286,289],{},[157,287,288],{},"Dekryptering af nøglen",": Modtageren bruger sin private nøgle til at dekryptere den symmetriske nøgle.",[175,291,292,295],{},[157,293,294],{},"Dekryptering af beskeden",": Til sidst bruger modtageren den dekrypterede symmetriske nøgle til at dekryptere chifferteksten og få den oprindelige klartekst frem.",[148,297,299],{"id":298},"hashalgoritmer","Hashalgoritmer",[153,301,302],{},"En hashalgoritme er en matematisk funktion, der omdanner inputdata af vilkårlig størrelse til en tegnstreng med fast længde, typisk en sekvens af bogstaver og tal. Outputtet kaldes en hashværdi eller et digest.",[165,304,306],{"id":305},"hvad-er-en-kollision","Hvad er en kollision?",[153,308,309],{},"En kollision i hashing opstår, når to forskellige datastykker giver den samme hashværdi med en hashalgoritme. Det kan være et problem, fordi hovedformålet med en hashalgoritme er at repræsentere forskellige datainput entydigt.",[165,311,313],{"id":312},"hvad-er-en-mac","Hvad er en MAC?",[153,315,316],{},"Message Authentication Code (MAC): I kryptografi er en MAC et kort stykke information, der bruges til at autentificere en besked og sikre dens integritet. Den bekræfter, at beskeden ikke er ændret, og fastslår afsenderens identitet.",[165,318,320],{"id":319},"hvad-er-forskellen-på-en-mac-og-en-hmac","Hvad er forskellen på en MAC og en HMAC?",[153,322,323],{},"MAC: En generel betegnelse for en kode, der verificerer en beskeds integritet og ægthed ved hjælp af enten blokchifre eller hashfunktioner.",[153,325,326],{},"HMAC: En bestemt type MAC, der bruger en kryptografisk hashfunktion og en hemmelig nøgle og dermed giver stærkere sikkerhedsegenskaber.",[148,328,330],{"id":329},"asymmetrisk-kryptografi","Asymmetrisk kryptografi",[165,332,334],{"id":333},"hvordan-foregår-signering-af-beskeder-overordnet","Hvordan foregår signering af beskeder overordnet?",[153,336,337],{},"Signering af beskeder er en kryptografisk proces, der bruges til at verificere en beskeds ægthed og integritet.",[258,339,340,346,352,358],{},[175,341,342,345],{},[157,343,344],{},"Dannelse af hashværdien:"," Afsenderen genererer et unikt digitalt fingeraftryk (en hashværdi) af beskeden med en kryptografisk hashfunktion (for eksempel SHA-256). Hashværdien repræsenterer beskedens indhold entydigt.",[175,347,348,351],{},[157,349,350],{},"Signering:"," Afsenderen krypterer hashværdien med sin private nøgle og danner dermed den digitale signatur. Det sikrer, at signaturen kun kan dannes af nogen med adgang til afsenderens private nøgle.",[175,353,354,357],{},[157,355,356],{},"Afsendelse:"," Den digitale signatur vedhæftes beskeden, og begge dele sendes til modtageren. Afsenderens offentlige nøgle stilles også til rådighed, så signaturen kan verificeres.",[175,359,360,363],{},[157,361,362],{},"Verifikation:"," Modtageren bruger afsenderens offentlige nøgle til at dekryptere den digitale signatur og få den oprindelige hashværdi frem. Derefter danner modtageren en ny hashværdi ud fra den modtagne besked og sammenligner den med den dekrypterede hashværdi. Hvis de stemmer overens, bekræfter det, at beskeden ikke er ændret, og det verificerer afsenderens identitet.",[165,365,367],{"id":366},"hvilke-tre-funktioner-har-asymmetrisk-kryptering","Hvilke tre funktioner har asymmetrisk kryptering?",[153,369,370],{},"Asymmetrisk kryptering, også kaldet offentlig nøgle-kryptografi, har flere vigtige funktioner, når kommunikation og data skal sikres.",[258,372,373,378,383],{},[175,374,375],{},[157,376,377],{},"Kryptering og dekryptering",[175,379,380],{},[157,381,382],{},"Digitale signaturer",[175,384,385],{},[157,386,387],{},"Nøgleudveksling",[165,389,391],{"id":390},"rsa","RSA",[153,393,394],{},"RSA, en forkortelse for Rivest-Shamir-Adleman, er et udbredt kryptosystem med offentlig nøgle til sikker dataoverførsel. Det er opkaldt efter opfinderne Ronald Rivest, Adi Shamir og Leonard Adleman, som præsenterede det i 1977.",[165,396,398],{"id":397},"diffie-hellman","Diffie-Hellman",[153,400,401],{},"Diffie-Hellman-nøgleudveksling er en metode i kryptografi til sikkert at udveksle kryptografiske nøgler over en offentlig kanal. Den blev udviklet af Whitfield Diffie og Martin Hellman i 1976. Formålet med Diffie-Hellman-nøgleudveksling er at gøre det muligt for to parter sikkert at danne en fælles hemmelig nøgle, som kan bruges til at kryptere den efterfølgende kommunikation.",[165,403,405],{"id":404},"digital-signature-algorithm-dsa","Digital Signature Algorithm (DSA)",[153,407,408],{},"Digital Signature Algorithm (DSA) er en kryptografisk algoritme med offentlig nøgle, der bruges til at danne og verificere digitale signaturer. Den blev foreslået af National Institute of Standards and Technology (NIST) i 1991 som en del af Digital Signature Standard (DSS).",[410,411,413],"h4",{"id":412},"sådan-fungerer-det","Sådan fungerer det",[258,415,416,422,428],{},[175,417,418,421],{},[157,419,420],{},"Nøglegenerering:"," DSA genererer et nøglepar: en privat nøgle til signering og en offentlig nøgle til verifikation.",[175,423,424,427],{},[157,425,426],{},"Signering",": Afsenderen bruger sin private nøgle til at danne en digital signatur på en besked. Signaturen er unik for både beskeden og den private nøgle.",[175,429,430,433],{},[157,431,432],{},"Verifikation",": Modtageren bruger afsenderens offentlige nøgle til at verificere signaturens ægthed og dermed beskedens integritet og oprindelse.",{"title":435,"searchDepth":436,"depth":436,"links":437},"",2,[438,446,451],{"id":150,"depth":436,"text":151,"children":439},[440,442,443,444,445],{"id":167,"depth":441,"text":170},3,{"id":201,"depth":441,"text":204},{"id":229,"depth":441,"text":230},{"id":239,"depth":441,"text":240},{"id":251,"depth":441,"text":252},{"id":298,"depth":436,"text":299,"children":447},[448,449,450],{"id":305,"depth":441,"text":306},{"id":312,"depth":441,"text":313},{"id":319,"depth":441,"text":320},{"id":329,"depth":436,"text":330,"children":452},[453,454,455,456,457],{"id":333,"depth":441,"text":334},{"id":366,"depth":441,"text":367},{"id":390,"depth":441,"text":391},{"id":397,"depth":441,"text":398},{"id":404,"depth":441,"text":405},"md","post",{"lang":461,"titleClass":462,"blogtitlepic":463,"socialimg":464,"customExcerpt":465,"asideNav":466,"maxContent":472},"da","h1-font-size","header-scepman-cryptography.png","/blog/heads/header-scepman-cryptography.png","Den centrale udfordring ved registrering af certifikater er, hvordan den enhed eller bruger, der anmoder om certifikatet, autentificeres. 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