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

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Sample text

Similarly, we can forget about transparent distributed object systems: some network objects will be kept well hidden within certain domains, and reaching them will require effort. In the early days of mobile agents, people envisioned agents moving freely across the network on behalf of their owners. We can now forget about this kind of free-roaming. If sites do not trust agents they will not allow them in. If agents do not trust sites to execute them fairly, they will not want to visit them. In general, we can forget about the notion of action-at-a-distance computing: the idea that resources are available transparently at any time, no matter how far away.

Moreover, this technique is designed solely for proving security; there is no mechanism for uncovering protocol flaws. The logic-based approach has proven to be particularly well-suited for automation. Millen’s Interrogator [22] is a Prolog-based search engine that searches for instantiations of a predicate signifying the intruder’s knowledge of specified data via some sequence of messages to an insecure goal state. While the Interrogator has successfully found protocol flaws fairly quickly, search time may vary significantly depending on the precise format of the protocol specification and the amount of information provided about the insecure goal states.

Abstracting a bit from people and computation devices, we see here a hierarchy of boundaries that enforce controls and require permissions for crossing. Passports are re- 16 L. ) agencies such as the NSA. Sometimes, whole mobile boundaries cross in and out of other boundaries and similarly need permissions, as the mobile environment of AF81 needs permission to enter an airspace. On the other hand, once an entity has been allowed across a boundary, it is fairly free to roam within the confines of the boundary, until another boundary needs to be crossed.

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