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Download PDF by Jens Groth (auth.), Xavier Boyen, Xiaofeng Chen (eds.): Provable Security: 5th International Conference, ProvSec

By Jens Groth (auth.), Xavier Boyen, Xiaofeng Chen (eds.)

ISBN-10: 3642243169

ISBN-13: 9783642243165

This e-book constitutes the refereed court cases of the fifth Provable protection convention held in in Xi'an, China, in October 2011. The 22 complete papers awarded including four brief papers and a pair of invited talks have been conscientiously reviewed and chosen from seventy five submissions. The papers are divided in topical sections on cryptographic primitives; encryption; cryptographic protocols; protection versions and framework; and key agreement.

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Additional resources for Provable Security: 5th International Conference, ProvSec 2011, Xi’an, China, October 16-18, 2011. Proceedings

Example text

PTSSZK) Let (P, V ) be an interactive proof (argument) for a language L = L(R), pt : N × N → N and ps : N × N → N be two monotonically increasing 2-variate functions. We say that (P, V ) is computational zero-knowledge, or just zero-knowledge, with time precision pt and space precision ps if there exists a probabilistic polynomial-time algorithm S, called precise simulator, such that for every polynomial-sized V ∗ and every {(x, w)} ∈ R the following conditions hold: 1. The output of S(x, V ∗ ) is computationally indistinguishable from the view of V ∗ in an execution of (P (w), V ∗ )(x).

IEEE, Los Alamitos (1987) Weak Oblivious Transfer from Strong One-Way Functions Keisuke Tanaka, Akihiro Yamada, and Kenji Yasunaga Tokyo Institute of Technology Abstract. We consider weak oblivious transfer (OT) from strong one-way functions and the paradigm of transforming unconditionally secure protocols in Maurer’s bounded storage model into computational secure protocols in the random oracle model. Weak OT is secure against adversaries which have a quadratic resource gap to honest parties. We prove that the random oracle can be replaced with strong one-way functions in the OT protocol.

Stage 1: V → P : V chooses σ ∈R {0, 1}n , s ∈R {0, 1}poly(n) and sends c = Com(σ; s). Then V proves to P via the perfectly WI PTSEAOK of the statement: there exist values σ and s such that c = Com(σ; s). Stage 2: P → V : P proves to V in the (slightly modified) n parallel repetitions of Blum’s proof [4] that x ∈ L, in which V opens c and uses the string σ as its challenge. Protocol 1. The PTSSZK proof for L. ) If viewP 1 is not a convincing view, S terminates the interaction. Otherwise, the extracted σ is that one V ∗ chose.

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Provable Security: 5th International Conference, ProvSec 2011, Xi’an, China, October 16-18, 2011. Proceedings by Jens Groth (auth.), Xavier Boyen, Xiaofeng Chen (eds.)


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