## Invited Paper: Probabilistic Polynomial-Time Process Calculus and Security Protocol Analysis (at LICS 2001)

**John C. Mitchell Ajith Ramanathan Vanessa Teague Andre Scedrov**

### Abstract

We describe properties of a process calculus that has been developed for the purpose of analyzing security protocols. The process calculus is a restricted form of p-calculus, with bounded replication and probabilistic polynomial-time expressions allowed in messages and boolean tests. To avoid problems expressing security in the presence of nondeterminism, messages are scheduled probabilistically instead of nondeterministically. We prove that evaluation may be completed in probabilistic polynomial time and develop properties of a form of asymptotic protocol equivalence that allows security to be speci£ed using observational equivalence, a standard relation from programming language theory that involves quantifying over possible environments that might interact with the protocol. We also relate process equivalence to cryptographic concepts such as pseudorandom number generators and polynomial-time statistical tests.

### BibTeX

@InProceedings{MitchellRamanathanT-ProbabilisticPolyno, author = {John C. Mitchell and Ajith Ramanathan and Vanessa Teague and Andre Scedrov}, title = {Probabilistic Polynomial-Time Process Calculus and Security Protocol Analysis}, booktitle = {Proceedings of the Sixteenth Annual IEEE Symposium on Logic in Computer Science (LICS 2001)}, year = {2001}, month = {June}, pages = {3--5}, location = {Boston, MA, USA}, note = {Invited Talk}, publisher = {IEEE Computer Society Press} }