Re: Block/stream ciphers which ARE a group
From: Peter Fairbrother (zenadsl6186_at_zen.co.uk)
Date: 11/21/04
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Date: Sun, 21 Nov 2004 16:54:24 +0000
Peter Fairbrother wrote:
> The vigenere-type keys (the strings) are not kept secret here, all that is
> secret is the combination of them which is used. The period comes more from
> the combination too, rather than from the length of the individual
> vigenere-type keys - the strings don't actually have to be anywhere near
> that long.
Actually the strings can in practice be 2,3,5,7,11,13,17 etc bits long.
Assuming that at least 20 bits are set, we would have a minimum of 10^26
bits of stream. Should be plenty.
-- Peter Fairbrother
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