Security

Download Automated Reasoning for Security Protocol Analysis and by Flemming Nielson, Han Gao (auth.), Alessandro Armando, Gavin PDF

By Flemming Nielson, Han Gao (auth.), Alessandro Armando, Gavin Lowe (eds.)

This publication constitutes the complaints of the Joint Workshop on computerized Reasoning for safety Protocol research and concerns within the thought of safety held in Paphos, Cyprus, in March 2010.

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Additional resources for Automated Reasoning for Security Protocol Analysis and Issues in the Theory of Security: Joint Workshop, ARSPA-WITS 2010, Paphos, Cyprus,March 27-28, 2010. Revised Selected Papers

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We say that N reveals s iff s = c, or s ∈ m ˜ and either q ∈ r˜ or ◦ = •. We say that N reveals a secret of (Γ ; Δ) if N reveals s for some s ∈ Secrets(Γ ; Δ). The definition readily extends to the general case when a secret may be rea : τ˜)N . N leaks a secret iff N reveals a stricted. E. In other words, a network leaks a secret whenever it either outputs it in clear, or sends it to a principal outside the secrecy group, or uses it as a channel (the name of a channel is always leaked upon output).

As in [1] we formalize strong secrecy in terms of behavioral equivalence, which in turn we define based on the bisimilarity α → M we relation that results from our LTS semantics. Given a transition M − let α ˆ denote α with the type annotations stripped away. Again, we restrict to admissible transitions, with respect to the secrecy assumptions provided by a typing environment. Definition 6 (Bisimilarity). A symmetric relation R between networks is a α (Γ ; Δ)-bisimulation if whenever M R N and M − → M with Γ ; Δ α, there α ˆ = α ˆ and M R N .

Once again, notice that this communication mode guarantees the freshness of the message. Secondly, even though zcan is closed by a non-certified input, the receiver can use that variable with type Secret(cust, bank) and not with type Any to type-check the continuation, since zcan is checked against can and the typing rule for the conditional branch refines the types for the considered values upon a successful match. Finally, although cust has not a mean to certify its messages, the expedition of ztid must come from cust, since ztid : W ith(zcan ) and zcan : Secret(cust, bank) by the previous point.

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