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Re: crypto flaw in secure mail standards
From: Jim Halfpenny <jim () openanswers co uk>
Date: Mon, 25 Jun 2001 09:59:27 +0100 (BST)



  Yes - An expert witness should (and presumably would) reduce the document
to just its signed portion and say "this, and only this, is what Alice
signed; there is no evidence who sent this where, as that was done after the
document was signed"

Does this then suggest there is a potential abuse of trust vulnerability
if digital signatures are used to provide non-repudiation in such
transactions? If you digitally sign a message with a signature stamped at
a significantly earlier date, you could use this as a defense to reduce
the integrity of the signature.

Establishing reasonable doubt could drastically alter the outcome of a
legal hearing, especially if the original message was deliberately made
vague, insofar as the intended recipient is ambiguous, so as to make this
form of attack seem plausible.

Cheers,
Jim Halfpenny


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