New PDF release: Computer Security – ESORICS 2004: 9th European Symposium on

By Shiping Chen, Duminda Wijesekera, Sushil Jajodia (auth.), Pierangela Samarati, Peter Ryan, Dieter Gollmann, Refik Molva (eds.)

ISBN-10: 3540229876

ISBN-13: 9783540229872

ISBN-10: 3540301089

ISBN-13: 9783540301080

This booklet constitutes the refereed lawsuits of the ninth eu Symposium on learn in desktop protection, ESORICS 2004, held in Sophia Antipolis, France in September 2004.

The 27 revised complete papers offered have been rigorously reviewed and chosen from 159 submissions. one of the themes addressed are entry regulate, authorization frameworks, privateness regulations, defense protocols, depended on computing, anonymity, info hiding, steganography, electronic signature schemes, encrypted communique, details movement keep watch over, authentication, key distribution, public key cryptography, intrusion prevention, and assault discovery.

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Read or Download Computer Security – ESORICS 2004: 9th European Symposium on Research in Computer Security, Sophia Antipolis, France, September 13 - 15, 2004. Proceedings PDF

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Additional info for Computer Security – ESORICS 2004: 9th European Symposium on Research in Computer Security, Sophia Antipolis, France, September 13 - 15, 2004. Proceedings

Sample text

Purpose hierarchies in [6], obligations in [5,14,22], and conditions on context information in [26]. 2 Syntax and Semantics of E-P3P Enterprise Privacy Policies Informally speaking, the aim of a privacy policy is to define by whom, for which purposes, and in which way collected data can be accessed. Further on, a privacy policy may impose obligations onto the organization using the data. Privacy policies formalize privacy statements like “we use data of a minor for marketing purposes only if the parent has given consent” or “medical data can only be read by the patient’s primary care physician”.

The notion of weak refinement has not been introduced before. Definition 15 (Policy Refinement). Let two well-formed privacy policies for with compatible vocabularies be given, and set for where Let and that refines (in and only if one of the following two conditions holds (1) for written be arbitrary. We say if and (2) We say that weakly refines (in and if and only if one of the following three conditions holds: (1) (2) We call signment a refinement of holds with replaced by written (3) written if and only if for every asand every authorization request we have We call a weak refinement of if the same Intuitively, a privacy policy that weakly refines another policy is at least as restrictive as the coarser one: Even if the original policy rules “allow” for a certain request, after a weak refinement the same request may be denied, or – provided that no obligations get lost – an “allow” can be transformed into a “don’t care”.

We further permit the exceptional ruling scope_error which indicates that a request was out of the scope of the policy. The semantics is defined by a virtual pre-processing that unfolds the hierarchies followed by a request processing stage. We stress that this is only a compact definition of the semantics and not an efficient real evaluation algorithm. Definition 8 (Unfolded Rules). For a privacy policy Pol = (Voc, R, dr), the unfolded rule set UR(Pol) is defined as follows: with with A crucial point in this definition is the fact that “deny”-rules are inherited both downwards and upwards along the four hierarchies while “allow”-rules are inherited downwards only.

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Computer Security – ESORICS 2004: 9th European Symposium on Research in Computer Security, Sophia Antipolis, France, September 13 - 15, 2004. Proceedings by Shiping Chen, Duminda Wijesekera, Sushil Jajodia (auth.), Pierangela Samarati, Peter Ryan, Dieter Gollmann, Refik Molva (eds.)


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