Download Automata, Languages and Programming: 26th International by Miklós Ajtai (auth.), Jiří Wiedermann, Peter van Emde Boas, PDF

By Miklós Ajtai (auth.), Jiří Wiedermann, Peter van Emde Boas, Mogens Nielsen (eds.)

This ebook constitutes the refereed court cases of the twenty sixth foreign Colloquium on Automata, Languages and Programming, ICALP'99, held in Prague, Czech Republic, in July 1999. The fifty six revised complete papers provided have been rigorously reviewed and chosen from a complete of 126 submissions; additionally incorporated are eleven inivited contributions. one of the themes addressed are approximation algorithms, algebra and circuits, concurrency, semantics and rewriting, procedure algebras, graphs, allotted computing, good judgment of courses, sorting and looking, automata, nonstandard computing, standard languages, combinatorial optimization, automata and logics, string algorithms, and utilized logics.

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Extra info for Automata, Languages and Programming: 26th International Colloquium, ICALP’99 Prague, Czech Republic, July 11–15, 1999 Proceedings

Example text

G. when the intruder successfully introduces a bogus session key. This method is an extremely powerful tool and has been used to find flaws in a variety of protocols, but it is not designed for proving positive results about security since it does not do a complete search of the search space. We remark that even though the search engine is logic programming based, it is quite different from the logic programming search presented in this paper. Woo and Lam [45] present an algebraic system in which the specification is given in terms of the protocol each agent follows (rather than in terms of an intruder’s state).

If the intruder sends a message of the form {k, A}KB , B will reply {Mi }k . Later, in steps (5) and (B), if the intruder sends a message of the form {Mi − 1}k , B will reply {Qi }k . It seems that we need two more Horn sentences. (B1) I(E(k, Mi )) ← I(E(K(B), [k, A])) (B2) I(E(k, Qi )) ← I(E(K(B), [k, A])), I(E(k, F (Mi ))) Notice that the second sentence says that the intruder cannot trick B into responding unless it can supply both of the messages B expects to receive in previous steps of the protocol.

The first example is one of virtual mobility achieved by physical means. Consider a software agent in a laptop. The agent can move by propagating over the network, but can also move by being physically transported with the laptop from one location to another. , bytecode verification) when it crosses administrative domains. , virus detection) when the laptop is physically allowed inside a new administrative domain. Do we need two completely separate security infrastructures for these two cases, or can we somehow find a common principle?

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