Information Security and Cryptology: 4th International by Bart Preneel (auth.), Moti Yung, Peng Liu, Dongdai Lin

By Bart Preneel (auth.), Moti Yung, Peng Liu, Dongdai Lin (eds.)

This e-book constitutes the completely refereed post-conference lawsuits of the 4th foreign convention on details safety and Cryptology, Inscrypt 2008, held in Beijing, China, in December 2008.

The 28 revised complete papers awarded including three invited talks have been rigorously reviewed and chosen from 183 submissions. The papers are geared up in topical sections on electronic signature and signcryption schemes, privateness and anonymity, message authentication code and hash functionality, safe protocols, symmetric cryptography, certificateless cryptography, implementation and part channel assault, instant community safeguard, public key and identification established cryptography, entry regulate and community safeguard, in addition to depended on computing and applications.

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Additional resources for Information Security and Cryptology: 4th International Conference, Inscrypt 2008, Beijing, China, December 14-17, 2008, Revised Selected Papers

Example text

Lin, and D. Ye σ Selectively Convert algorithm to generate the selective proof Ppkm, A ,pkB and returns it to F . – Universally Convert Oracle: On input two public keys pk1 (nominator) and pk2 (nominee), it runs Universally Convert algorithm to generate the universal proof PpkA ,pkB and returns it to F . The security notions for convertible nominative signature include: Unforgeability, Invisibility, Non-impersonation and Non-repudiation. We will make detailed descriptions for them in the following subsections.

E. A is indicated as the nominator, then if both y2 = yB and m = m are satisfied, S aborts and fails to solve the WCDH-I 2 2 2 problem; otherwise, S sets σ1 = H(m y1 y2 )x1 x2 = (g r )x1 x2 = U rx2 . 2. e. A is indicated as the nominee, S sets σ1 = 2 2 H(m y1 y2 )x1 x2 = (g r )x1 x2 = W rx1 . • Case (2): If role=nominator, S simulates the behavior of a nominee and interacts with FI according to Signing protocol except the following subcase: if y2 = yA , similarly to the subcase 2 in case (1). • Case (3): If role=nominee, S simulates the behavior of a nominator and interacts with FI according to Signing protocol except the following subcase: if y1 = yA , similarly to the subcase 1 in case (1).

E. the success −1 . So, the success probability probability that S guesses m = m∗ correctly, is qH −1 −1 that S solves WCDH-I problem is qH ≥ Q . The time t of running is at most t + Qtq + c where tq is the maximum time for simulating one oracle query and c denotes some constant time of system setup and key generation. This completes our proof. Lemma 2 (Adversary II). The above convertible nominative signature scheme is existentially unforgeable against Adversary II if WCDH-II problem is hard. Proof.

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