An authentication compiler Sample Clauses

An authentication compiler. In [6], Xxxx et al. introduced a scalable compiler which transforms any GKA protocol P , secure against passive adversary, to an authenticated GKA protocol P ′, secure against an active adversary. It achieves this by enhancing the protocol to include a (pre-)round where everyone broad- casts its identity and a random nonce. Thereafter each mes- sage is accompanied by a signature on the message, identi- ties of the participants and their nonces (see [6] for details). Then if P is a secure GKA protocol, then the protocol P ′ is a secure Authenticated GKA protocol. Namely, where: qex and qs are the number of Execute and Send queries respectively. ' |P| t′ = t + ( qex + qs).tP ' , tP ' is the time to execute P ′. AdvPA' (t, qex, qs): Advantage of an active adversary ( ′) against the authenticated protocol P ′, making qex Execute queries and qs Send queries in time t. AdvPA(t′, 1): Advantage of a passive adversary ( ) against the protocol P , making 1 Execute query in time t′. A AdvPA(t, qex): Advantage of a passive adversary ( ) against the protocol P , making qex Execute queries in time t′. SuccDDH(t′): Success probability of an adversary against an instance of the DDH problem in time t′. SuccΣ(t′): Success probability of an adversary against the signature scheme Σ in time t′. and k is the security parameter.
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