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



Jacob Bunk Nielsen wrote:
Arne Jørgensen <sslug@sslug> writes:

Jacob Bunk Nielsen <sslug@sslug> writes:


så laver man 3DES ved: c = e(d(e(x),k3), k2), k1).

I flg. Tannenbaum, "Computer Networks", 4. udgave, s. 740 er k1=k3 i 3DES.


Jeg kan desværre ikke lige finde noget bedre end Handbook of Applied
Cryptography, som siger at man *kan* bruge 2-nøgle 3DES, men at man
ikke nødvendigvis behøver at gøre det. Den er dog ret svag i sine
formuleringer om emnet.

<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
<citat>
In 3DES, we apply 3 stages of DES with a seperate key for each stage. So the key length in 3DES is 168 bits.
</citat>


Så kan det vel knapt udtrykkes klarere.......

Med venlig hilsen
Egon Andersen


 
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