Foundations of Security Analysis and Design: Tutorial by Peter Y. A. Ryan (auth.), Riccardo Focardi, Roberto Gorrieri

By Peter Y. A. Ryan (auth.), Riccardo Focardi, Roberto Gorrieri (eds.)

Protection is a speedily becoming region of desktop technology, with direct and extending relevance to actual lifestyles functions corresponding to net transactions, digital trade, info security, community and structures integrity, and so forth. This quantity provides completely revised types of lectures given through top protection researchers throughout the IFIP WG 1.7 overseas college on Foundations of defense research and layout, FOSAD 2000, held in Bertinoro, Italy in September. Mathematical types of laptop protection (Peter Y.A. Ryan); The common sense of Authentication Protocols (Paul Syversen and Iliano Cervesato); entry keep an eye on: regulations, types, and Mechanisms (Pierangela Samarati and Sabrina de Capitani di Vimercati); safeguard objectives: Packet Trajectories and Strand areas (Joshua D. Guttman); Notes on Nominal Calculi for protection and Mobility (Andrew D. Gordon); type of protection homes (Riccardo Focardi and Roberto Gorrieri).

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A secure encryption channel now passes the form of non-interference defined in Equation 17 instantiated with these abstractions and equivalences. Indeed the information flow seems to have been quite accurately encoded: Low can determine the length of a High message transmitted over c but not its contents. It does, however, fail to take account of the fact that Low could detect when identical cipher-texts have been transmitted. Presumably if we really are dealing with a one-time-pad this is not relevant: the occurence of identical cipher-texts is firstly extremely unlikely and secondly signifies nothing.

The essential idea is to stipulate that whatever observations Low may make of the system the space of possible High level inputs consistent with those observations is unchanged. Intuitively this is rather appealing and appears to address the encryption problem: whatever ciphertext Low observes he cannot reduce the space of plaintexts compatible with this ciphertext. We need to partition the High level events into inputs and outputs. We then restrict the high-level processes in the definition to ones with an alphabet drawn Mathematical Models of Computer Security 45 only from High inputs and we use this in the definition of Equation 17.

In fact a far more elegant and insightful proof is possible when one observes that the unwinding rules actually bear a striking resemblance to the notion of bi-simulation, allowing us to borrow some results from the process algebra literature. First we need to introduce a few ideas from the operation style of process semantics. 10 Operational Semantics An operational semantics is typically presented in the form of transition rules. µ Thus P −→ P indicates that the process term P can make a transition labelled µ to the process term P .

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