New PDF release: Formal Aspects in Security and Trust: 6th International

By Anindya Banerjee (auth.), Pierpaolo Degano, Joshua D. Guttman (eds.)

ISBN-10: 3642124585

ISBN-13: 9783642124587

This publication constitutes the completely refereed post-workshop lawsuits of the sixth foreign Workshop on Formal features in defense and belief, speedy 2009, held less than the auspices of IFIP WG 1.7 in Eindhoven, The Netherlands, in November 2009 as an occasion of the Formal tools Week, FMweek 2009. The 18 revised papers awarded including an summary of the invited lecture have been rigorously reviewed and chosen from 50 submissions. The papers concentration of formal features in protection and belief coverage types, safeguard protocol layout and research, formal versions of belief and acceptance, logics for defense and belief, dispensed belief administration platforms, trust-based reasoning, electronic resources security, facts defense, privateness and identity matters, info circulation research, language-based protection, defense and belief elements in ubiquitous computing, validation/analysis instruments, net carrier security/trust/privacy, grid defense, protection possibility evaluation, and case experiences.

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Extra info for Formal Aspects in Security and Trust: 6th International Workshop, FAST 2009, Eindhoven, The Netherlands, November 5-6, 2009, Revised Selected Papers

Example text

This estimate, denoted by B (s | h), is related to the sequence h as follows. 24 E. ElSalamouny, V. Sassone, and M. Nielsen B (s | h ) = #s (h ) + 1 #s (h ) + #f (h ) + 2 (1) where #s (h ) and #f (h ) are the numbers of successful and unsuccessful interactions in h respectively. In order to cope with the cases where the behaviour of a principal is dynamic, the notion of exponential decay (or forgetting) has been incorporated in the Beta trust model [12]. The intuitive idea is to capture the most recent behaviour of the principal by favouring the recent outcomes over old ones.

Definition 4 (History Evaluation). Let ES be an event structure, TS = (D, , ) a trust structure and τ a complete set of justifications and h a local interaction history with respect to ES and TS respectively. We define the history evaluation τ ∗ by: τ ∗ (h) = def where ⊥ , ({d ∈ D |(KES,h , 0) |= τ (d)}), denotes the supremum with respect to if h = λ otherwise . Compatibility with the SECURE framework. SECURE offers a way to calculate a global trust state (an exact definition can be found in [Kru06], for the purpose of this section an intuitive idea of a matrix that contains information about “who trusts whom to what degree” is sufficient), given a set of policies for each principal identity.

M 1 Error (λ, Aσ ) ≈ ej (22) m j=1 The above approximation of the expected estimation error by the sample average is based on the law of large numbers. Note that the approximation error can be made arbitrarily small by making the sample size m sufficiently large. 0 1−s 3 1−s 3 s 1−s 3 (23) 1 − s ⎤⎥ ⎥ 3 ⎥⎥⎥⎥ ⎥⎥ 1 − s ⎥⎥⎥⎥ ⎥ 3 ⎥⎥⎥⎥ ⎥⎥ 1 − s ⎥⎥⎥⎥⎥ 3 ⎥⎥⎥⎥ ⎥⎥⎥ ⎥ s ⎦ (24) where the parameter s is called the system stability, which indicates the tendency of the system to staying in the same state rather than transiting to a different one.

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Formal Aspects in Security and Trust: 6th International Workshop, FAST 2009, Eindhoven, The Netherlands, November 5-6, 2009, Revised Selected Papers by Anindya Banerjee (auth.), Pierpaolo Degano, Joshua D. Guttman (eds.)


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