Formal Aspects of Security and Trust: 7th International by Dusko Pavlovic (auth.), Pierpaolo Degano, Sandro Etalle,

By Dusko Pavlovic (auth.), Pierpaolo Degano, Sandro Etalle, Joshua Guttman (eds.)

This ebook constitutes the completely refereed post-proceedings of the seventh overseas Workshop on Formal facets of safeguard and belief, speedy 2010, held as a part of the eighth IEEE foreign convention on software program Engineering and Formal tools, SEFM 2010 in Pisa, Italy in September 2010. The 14 revised complete papers awarded including one invited paper have been conscientiously reviewed and chosen from forty two submissions. The papers concentration of formal elements in safeguard and belief coverage types, defense protocol layout and research, formal versions of belief and attractiveness, logics for defense and belief, dispensed belief administration platforms, trust-based reasoning, electronic resources security, facts security, privateness and identity matters, info move research, language-based safeguard, protection and belief features in ubiquitous computing, validation/analysis instruments, net carrier security/trust/privacy, grid safeguard, safeguard hazard review, and case studies.

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Additional info for Formal Aspects of Security and Trust: 7th International Workshop, FAST 2010, Pisa, Italy, September 16-17, 2010. Revised Selected Papers

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Organization. In Section 2, we introduce basic definitions and notation. In Section 3, we present our algorithms and their properties. In Section 4, we extend the methods of Section 3 to handle symmetric encryption with the prefix property. As a case study, we analyze the security of the Kerberos protocol against off-line guessing attacks. We draw conclusions in Section 5. For reasons of space and readability, full proofs are given in the technical report [19]. 2 Background and Basic Definitions Given a function g, we denote by dom(g) and by ran(g) its domain and range, respectively.

We believe that this is one reason for the successful use in the past years of model checkers for protocol verifications. In the technical report [15], we show that many anomalies can be realized using our bounded memory intruder. Table 2 summarizes the number of P (∗) and R(∗) facts and the upper bound on the size of facts needed to encode normal runs, where no intruder is present, and to encode the anomalies where the bounded memory intruder is present. We specify protocols using rules that handle encryption and decryption, as in [12].

However, if actions are not allowed to update values with fresh ones, then they show that the same problem is PSPACEcomplete. Furthermore, if actions can delete or insert exactly one fact and in the process one can also check for the presence of other facts and even update values with nonces, then they show the problem is NP-complete, but in their proof they implicitly impose a bound on the number of nonces that can be used. In their proofs, the non-commutative nature of their encoding plays an important role.

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