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Lookup NU author(s): Dr Paolo Modesti
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© 2016 Elsevier LtdDesigning distributed protocols is complex and requires actions at very different levels: from the design of an interaction flow supporting the desired application-specific guarantees to the selection of the most appropriate network-level protection mechanisms. To tame this complexity, we propose AnBx, a formal protocol specification language based on the popular Alice & Bob notation. AnBx offers channels as the main abstraction for communication, providing different authenticity and/or confidentiality guarantees for message transmission. AnBx extends existing proposals in the literature with a novel notion of forwarding channels, enforcing specific security guarantees from the message originator to the final recipient along a number of intermediate forwarding agents. We give a formal semantics of AnBx in terms of a state transition system expressed in the AVISPA Intermediate Format. We devise an ideal channel model and a possible cryptographic implementation, and we show that, under mild restrictions, the two representations coincide, thus making AnBx amenable to automated verification with different tools. We demonstrate the benefits of the declarative specification style distinctive of AnBx by revisiting the design of two existing e-payment protocols: iKP and SET.
Author(s): Bugliesi M, Calzavara S, Modersheim S, Modesti P
Publication type: Article
Publication status: Published
Journal: Journal of Information Security and Applications
Print publication date: 01/10/2016
Online publication date: 21/06/2016
Acceptance date: 02/04/2016
ISSN (print): 2214-2134
ISSN (electronic): 2214-2126
Publisher: Elsevier Ltd
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