

Symposium on logic and computability "Logic and Computation Day"
June 7, 2013 10:00, Moscow, Steklov Mathematical Institute of RAS






Bounded Memory Protocols and the Unbounded Adversary
A. Scedrov^{} ^{} University of Pennsylvania

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Abstract:
The DolevYao adversary is a nondeterministic adversary which can act as the network, intercept, send, compose and decompose messages, and remember as much information as it needs. That is, its memory is unbounded. We recently proposed a weaker DolevYao like adversary, which can also act as the network, but whose memory is bounded. We showed that this Bounded Memory DolevYao adversary, when given enough memory, can carry out many existing protocol anomalies. In particular, the known anomalies arise for bounded memory protocols, where there is only a bounded number of concurrent sessions and the honest participants of the protocol cannot generate an unbounded number of facts nor an unbounded number of nonces. This led us to the question of whether it is possible to infer a computable upper bound on the memory required by the standard, unbounded DolevYao adversary to carry out a protocol anomaly from the memory restrictions of the bounded protocol. We answer this question negatively. This is joint work with Max Kanovich, Tajana Ban Kirigin, and Vivek Nigam.
Language: English

