[RC5] guessing bytes

richard L. King Jr. richardking57 at hotmail.com
Thu Oct 11 19:44:09 EDT 2001


actually the more i play with it the more i think i found no more
than a coincidence. the first two test cases worked and the next
100 plus failed. i should have payed more attention in algebra class.




>From: "Brough, Adrian (IR SOLUTIONS)"  <adrian.brough-eds at eds.com>
>Reply-To: rc5 at lists.distributed.net
>To: "'rc5 at lists.distributed.net'" <rc5 at lists.distributed.net>
>Subject: RE: [RC5] guessing bytes
>Date: Thu, 11 Oct 2001 20:53:22 +0100
>
>So this means that you have found a weakness in the RC64 encryption
>algorithm. If I managed to find a weakness with it, I wouldn't bother with
>trying to win this competition, I'd go straight to RSA and ask for a large
>amount of money to reveal the weakness to them (or to not reveal it to the
>public domain)
>
>
>
>
>
>
>
>-----Original Message-----
>From: richard L. King Jr. [mailto:richardking57 at hotmail.com]
>Sent: 09 October 2001 2:12 pm
>To: rc5 at lists.distributed.net
>Subject: [RC5] guessing bytes
>
>
>
>i manipulated ct, iv, pt, p, and q and came up with
>possible values for the left most byte of the 64 bit contest key.
>which seems to indicate that the contest could be
>over in as little as 2 days if correct.
>
>good hunting.
>
>8A XX XX XX XX XX XX XX
>
>92 XX XX XX XX XX XX XX
>
>CD XX XX XX XX XX XX XX
>
>E5 XX XX XX XX XX XX XX
>
>
>
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