Following up on my previous post (netiquette? what's that?) one further clarification
(and summary of my thoughts): the heart of the Mafia Fraud attack lies -I think- in
that the challenge messages provide no proof of origin (who created them) nor of
intended recipient (who were they intended for). A simple extension of the challenge
message to include this information, protected with a simple digital signature scheme,
is -in my opinion- enough to overcome the problem.
Regards,
Dimitrios Petropoulos
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