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Re: [TEKNIK] Re: Findes et os pop3 system, der er let at administrereog som er sikkert?



Jacob Bunk Nielsen wrote:
Egon Andersen <sslug@sslug> writes:

Jacob Bunk Nielsen wrote:


<http://kingkong.me.berkeley.edu/~kenneth/courses/sims250/des.html>
siger at du har ret.

Så skal du da vist have briller! Der står at læse i afsnit 1.2 Overview of 3DES


Prøv så at læse afsnit 2.2 :-)

Ja, den siger at der findes tre måder:

1) The keys k1, k2, and k3 are independent.
2) k1 and k2 are independent but k1 = k3
3) k1 = k2 = k3  - In this case, 3DES becomes backward compatible with DES.

1 => 3x56 bit nøgle
2 => 2x56 bit nøgle
3 => 1x56 bit nøgle (og er iøvrigt identisk med DES og bør ikke bruges)

Så 3DES har altså et nøglerum på 3x56 bit, men du kan selvfølgelig vælge nøgler mere eller mindre intelligent, hvor der er sammenfald mellem dele, som fx. k1=k3.

Med venlig hilsen
Egon Andersen


 
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