Security

Rational authentication protocols

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Executive Summary

The authors use ideas from game theory to transform two families of authentication protocols so that even an intruder attacks a protocol, its payoff will still be lower than when it does not. This is particularly useful in resisting or discouraging a powerful and rational intruder (as present in military applications) who makes many attempts to break a protocol because even the intruder fails, a denial of service attack is still mounted successfully, and in a password-based protocol, the chance of a successful attack increases quite significantly as more and more attempts are launched to guess the password.

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