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List:       linux-crypto
Subject:    Re: (AES) loopback crypto questions
From:       Tim Walberg <twalberg () mindspring ! com>
Date:       2001-07-11 17:48:30
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On 07/11/2001 18:40 +0100, Dale Amon wrote:
>>	3) Encrypting sequentially with two different symmetric
>>	keys of 256 bits will have an end result that has a
>>	security of 256 <= equivkeysize <= 512.
>>	


This is not always true; there are known cases where, due
to weaknesses in algorithms, encrypting twice may actually
be weaker than encrypting once - i.e. you may end up with
equivkeysize < 256. This really depends on the algorithm
and the choice of keys, though (many algorithms have certain
keys that are weaker than others, as well).



-- 
twalberg@mindspring.com

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