Subject: Re: [Cfrg] Re: Hmac strength

From: Ran Canetti <[email-masked]>
Date: Mon, 7 Oct 2002 19:45:41 -0400

The issue is discussed in the RFC. Basically, there is no evidence that this
extra hasing adds anything. (Keys are anyway hashed in the first application
of the compression function of the underlying hash function.)

Ran

> From: Anonymous User <[email-masked]>
> 
> In a recent thread on sci.crypt ("Re: Hmac strength")
> John Hadstate and Nicol So were curious about the rationales
> in RFC-2104 for hashing only overly long HMAC keys before use,
> and for recommending certain keysize limits.
> Can anyone shed further light on the subject?
> 
> 
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