David Baelde, Stéphanie Delaune, and Lucca Hirschi. A reduced semantics for deciding trace equivalence using constraint systems. In * Proceedings of the 3rd International Conference on Principles of Security and Trust (POST'14)*, pp. 1–21, Lecture Notes in Computer Science 8414, Springer, Grenoble, France, April 2014.

Many privacy-type properties of security protocols can be modelled using trace equivalence properties in suitable process algebras. It has been shown that such properties can be decided for interesting classes of finite processes (i.e., without replication) by means of symbolic execution and constraint solving. However, this does not suffice to obtain practical tools. Current prototypes suffer from a classical combinatorial explosion problem caused by the exploration of many interleavings in the behaviour of processes. Modersheim et al. have tackled this problem for reachability properties using partial order reduction techniques. We revisit their work, generalize it and adapt it for equivalence checking. We obtain an optimization in the form of a reduced symbolic semantics that eliminates redundant interleavings on the fly.

@inproceedings{BDH-post14, abstract = {Many privacy-type properties of security protocols can be modelled using trace equivalence properties in suitable process algebras. It has been shown that such properties can be decided for interesting classes of finite processes (i.e.,~without replication) by means of symbolic execution and constraint solving. However, this does not suffice to obtain practical tools. Current prototypes suffer from a classical combinatorial explosion problem caused by the exploration of many interleavings in the behaviour of processes. Modersheim et~al. have tackled this problem for reachability properties using partial order reduction techniques. We revisit their work, generalize it and adapt it for equivalence checking. We obtain an optimization in the form of a reduced symbolic semantics that eliminates redundant interleavings on the fly.}, address = {Grenoble, France}, author = {Baelde, David and Delaune, St{\'e}phanie and Hirschi, Lucca}, booktitle = {{P}roceedings of the 3rd {I}nternational {C}onference on {P}rinciples of {S}ecurity and {T}rust ({POST}'14)}, OPTDOI = {10.1007/978-3-642-54792-8_1}, editor = {Abadi, Mart{\'\i}n and Kremer, Steve}, month = apr, pages = {1-21}, publisher = {Springer}, series = {Lecture Notes in Computer Science}, title = {A~reduced semantics for deciding trace equivalence using constraint systems}, volume = {8414}, year = {2014}, acronym = {{POST}'14}, nmonth = {4}, lsv-category = {intc}, wwwpublic = {public and ccsb}, }