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REM (Reduce Elan Machine): Core of the New ELAN Compiler

ELAN is a powerful language and environment for specifying and prototyping deduction systems in a language based on rewrite rules controlled by strategies. It offers a natural and simple logical framework for the combination of the computation and deduction paradigms. It supports the design of theorem provers, logic programming languages, constraint solvers and decision procedures. ELAN takes f...

Non-deterministic Computations in ELAN

The ELAN system is an environment for specifying and prototyping constraint solvers, theorem provers and deduction systems in general. It also provides a framework for experimenting their combination. The ELAN language is based on rewriting logic and evaluation of labelled conditional rewrite rules. ELAN has two originalities with respect to several other algebraic languages, namely to handle n...

Input/Output for ELAN

We show how to add Input/Output capabilities to the ELAN rewriting interpreter using a rewrite speciication of-calculus. This I/O system has the advantage of being totally explicit and t in the same semantic framework than any other \application program". An actual implementation shows the eeectiveness of this approach.

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Specifying Authentication Protocols Using ELAN

The Needham-Schroeder public-key protocol [NS78] has been already analyzed using several methodologies from model-checkers like FDR [Ros94] to approaches based on theorem proving like NRL [Mea96]. Although this protocol is simple it has been proved insecure only in 1995 by G. Lowe [Low95]. After the discover of the security problem and the correctness proof of a modified version in [Low96] seve...