2001 | OriginalPaper | Buchkapitel
Tree Automata with One Memory, Set Constraints, and Ping-Pong Protocols
verfasst von : Hubert Comon, Véronique Cortier, John Mitchell
Erschienen in: Automata, Languages and Programming
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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We introduce a class of tree automata that perform tests on a memory that is updated using function symbol application and projection. The language emptiness problem for this class of tree automata is shown to be in DEXPTIME. We also introduce a class of set constraints with equality tests and prove its decidability by completion techniques and a reduction to tree automata with one memory. Set constraints with equality tests may be used to decide secrecy for a class of cryptographic protocols that properly contains a class of memoryless “ping-pong protocols” introduced by Dolev and Yao.