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Re: [TEKNIK] Sikkerhed af krypteringsalgoritmer (Was: Findes et ospop3 system, der er let at administrere og som er sikkert?)



Jacob Sparre Andersen wrote:
[snip]

Hvis du med »hullet« mener at den effektive nøglelængde er mindre end den reelle nøglelængde, så er stort set alle krypteringsalgoritmer vist hullede.

Det man bør spørge til er den effektive nøglelængde. - Og hvis man vil
tænke langsigtet, hvor meget kortere den forventes at blive i
systemets levetid.

Nøglelængden i DES er faktisk 64-bit og i 3DES op til 3x64-bit, men pga. paritetskrav, er den effektive nøglelængde hhv. 56-bit og 3x56-bit ;-)


Jeg ved ikke helt hvad du mener med "meget kortere den forventes at blive i systemets levetid."
Tænker du på forventning til at finde sårbarheder i algoritmen?
I så tilfælde må vel siges at netop DES og 3DES er velafprøvede og svagheden ved DES er vel egentligt hovedsageligt nøglerummet på 56-bit.


Med venlig hilsen
Egon Andersen


 
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