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Message-ID: <44386409.4000903@gmail.com>
Date: Sat, 08 Apr 2006 20:31:53 -0500
From: Dennis Olvany <dennisolvany@...il.com>
To: john-users@...ts.openwall.com
Subject: Re: hash collisions
Solar Designer wrote:
> For most hash types, the number of inputs is also finite - even in
> theory. And it is finite for all of them in practice.
Do you refer to password hashing specifically? Algorithms such as MD5
and SHA1 digest the entire input, correct? So, while I suppose that the
input may be finite I would venture to guess that it is only limited by
a maximum file size, which is certainly far beyond 56 bits.
> [crypt] input is truncated to 56 bits
Crypt truncates to eight characters, right? I am thinking that 8
characters at 8 bits per character is 64 bits. The most significant bit
in each character is removed because it is always zero? Perhaps it
causes a cryptographic weakness for every eighth bit to be a zero?
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