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Re: Carl Ellison on 'The Death of DES'
>Date: Wed, 29 Sep 1993 08:56:21 -0600 (MDT)
>From: Michael Johnson <[email protected]>
>Subject: Re: Carl Ellison on 'The Death of DES'
>To: Mike McNally <[email protected]>
>In-Reply-To: <[email protected]>
>Message-Id: <[email protected]>
> In other words, des | tran really
>isn't much stronger than des
des | tran is exactly as secure as des. A final tran adds nothing. It
looks messed up to a human, but there's no cryptographic value added.
tran is of value *only* between two strong ciphers and its only value is to
increase the size of the block affected by the surrounding ciphers.
> , but des|tran|des|tran|des|tran|des|tran...
>could be quite strong (not to mention slow).
Try the new tran. The one originally posted had a slow (LC) PRNG.
The new one uses subtract-with-borrow and it's faster.
Another consumer warning: the s-w-b PRNG has a huge period but that doesn't
make it cryptographically secure. If anything, this is probably the easiest
PRNG to break.
- Carl