[11919] in cryptography@c2.net mail archive
Re: Why is RMAC resistant to birthday attacks?
daemon@ATHENA.MIT.EDU (Ed Gerck)
Thu Oct 24 10:13:37 2002
Date: Wed, 23 Oct 2002 19:41:52 -0700
From: Ed Gerck <egerck@nma.com>
To: David Wagner <daw@mozart.cs.berkeley.edu>
Cc: cryptography@wasabisystems.com
David Wagner wrote:
> Ed Gerck wrote:
> >(A required property of MACs is providing a uniform distribution of values for a
> >change in any of the input bits, which makes the above sequence extremely
> >improbable)
>
> Not so. This is not a required property for a MAC.
> (Not all MACs must be PRFs.)
Thanks. I should have written "a usually required property". In general,
to have a good MAC, we require a good PRF.
Ed Gerck
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