Breaking DES
Victor A. Borisov
blaster at rd.relcom.msk.su
Tue Oct 12 02:59:54 PDT 1993
> The other reason is that it was initially feared that DES was a group.
> That is, encryption with k1 and k2 might be equivalent to single encryption
> with some unknown (to you and me) key k3. But a cryptanalyst or a brute-
> force cracker would neither know nor care that you double-encrypted.
>
> It has now been proved that DES is not a group. What isn't clear to me
> is whether it's ``mostly closed'', though I suspect not.
It can be right, but we can use some intermidiant operation. For example:
DES(randomHeader+DES(zip(DES (text, k1)), k2), k3)
DES (text, k) - encryption text "text" by key k;
randomHeader - some good random text;
zip - some archiver.
---
Victor A. Borisov aka blaster; Relcom R&D;
Email: blaster at rd.relcom.msk.su;
Phone: +7(095)-943-4735; +7(095)-198-9510;
=== Don`t panic! ===
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