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Download Computer Aided Verification: 10th International Conference, by Nicolas Halbwachs (auth.), Alan J. Hu, Moshe Y. Vardi (eds.) PDF

By Nicolas Halbwachs (auth.), Alan J. Hu, Moshe Y. Vardi (eds.)

This publication consitutes the refereed court cases of the tenth foreign convention on desktop Aided Verification, CAV'98, held in Vancouver, BC, Canada, in June/July 1998. The 33 revised complete papers and 10 software papers provided have been rigorously chosen from a complete of 117 submissions. additionally integrated are eleven invited contributions. one of the issues coated are modeling and specification formalisms; verification thoughts like state-space exploration, version checking, synthesis, and automatic deduction; a number of verification strategies; purposes and case reports, and verification in practice.

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Extra info for Computer Aided Verification: 10th International Conference, CAV'98 Vancouver, BC, Canada, June 28 – July 2, 1998 Proceedings

Sample text

As per our running example, Alice controls access to a machine room. We simulate a scenario in which Charlie wishes to enter the machine room for the first time. To do so, his prover will be asked to generate a proof of Dept says open(door1). His prover will immediately realize that Dept should be asked for help, but will continue to reason about this formula using local knowledge in the hope of finding a proof without making a request. Lacking sufficient authority, this local reasoning will fail, and Charlie will be presented with the option to ask Dept for help.

Avoiding a request to the department head in this case improves the overall efficiency of proof generation, but in general requires Alice to try to prove all goals for which she would normally ask for help, again increasing the amount of local computation. The increase in computation imposed by each requirement may seem reasonable, but when implemented as a straightforward extension of previous work, Alice’s prover running on a Nokia N70 smartphone will take over 5 minutes to determine the set of possible ways in which she can help Charlie gain access.

The graph also shows the division of computation between the incremental algorithms FC and PC and the backward search using tactics. In overall computation, HC is six times slower than LR and 60 times slower than LR . This does Efficient Proving for Practical Distributed Access-Control Systems 33 Total number formulas investigated Number of unique formulas investigated not include the transit time between phones, or the time spent waiting for users to choose between different options. Since computation time is dependent 30000 500 Total on the Prolog implementation, as a more Unique general metric of efficiency we also mea25000 400 sure the number of formulas investigated 20000 by each strategy.

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