Re: $1000 reward

From: Tom St Denis (tom_at_securescience.net)
Date: 05/06/04 

Date: Thu, 06 May 2004 13:04:02 GMT

cascade wrote:
> Simon Johnson <ckwop@hotmail.com> wrote in message news:<c7aalg$613$1@titan.btinternet.com>...
>
>>>Every encryption design is arrived at by trial and error.
>>
>>Well maybe the community as a whole works like that but not on a cipher
>>by cipher basis. AES was secure first time around.. Sure it learn't from
>>the cryptanalytic results of other ciphers but this is much different
>>from your process.
>>
>>Besides, We know for example that BBS can't be broken unless you can
>>efficiently factor. They proposed the design and then proved the result
>>in the same paper. There's was no trial and error in that design at all.
>>
>>Simon.
>>
>>ps. Does anyone have a copy of the original paper BBS.. It's impossible
>>to find via google :P
>
>
> BBS is the exception. It is not a practical stream cipher. Maybe
> mathematics will advance and prove and/or design provably secure fast
> stream ciphers. Uptil now it has not been the case.

Um little problem here. Nobody has proven the BBS is secure. It's *as*
secure as the inability to factor large numbers [AEBE]. Factoring has
*never* been shown to be hard. Therefore, it isn't correct to conclude
BBS is hard too.

Tom

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