On Wed, Jan 28, 2009 at 6:41 PM, George Fletcher <gffle...@aol.com> wrote:
> The request is only valid if the receiving
> authentication system can generate the signature using the password for
> that user.

Lots of authentication servers can't do that, because they do not keep
a clear-text version of the user's password.  Instead they store a
salted hash.

I love Thomas Ptacek's summary of password storage schemes:
http://www.matasano.com/log/958/enough-with-the-rainbow-tables-what-you-need-to-know-about-secure-password-schemes/

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