Download Topics in Cryptology – CT-RSA 2009: The Cryptographers’ by Benoît Libert, Damien Vergnaud (auth.), Marc Fischlin (eds.) PDF

By Benoît Libert, Damien Vergnaud (auth.), Marc Fischlin (eds.)

This e-book constitutes the refereed court cases of the Cryptographers' song on the RSA convention 2009, CT-RSA 2009, held in San Francisco, CA, united states in April 2009.

The 31 revised complete papers provided have been rigorously reviewed and chosen from ninety three submissions. The papers are equipped in topical sections on identity-based encryption, protocol research, two-party protocols, greater than signatures, collisions for hash services, cryptanalysis, substitute encryption, privateness and anonymity, potency advancements, multi-party protocols, protection of encryption schemes in addition to countermeasures and faults.

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Topics in Cryptology – CT-RSA 2009: The Cryptographers’ Track at the RSA Conference 2009, San Francisco, CA, USA, April 20-24, 2009. Proceedings

This e-book constitutes the refereed court cases of the Cryptographers' music on the RSA convention 2009, CT-RSA 2009, held in San Francisco, CA, united states in April 2009. The 31 revised complete papers awarded have been rigorously reviewed and chosen from ninety three submissions. The papers are geared up in topical sections on identity-based encryption, protocol research, two-party protocols, greater than signatures, collisions for hash capabilities, cryptanalysis, substitute encryption, privateness and anonymity, potency advancements, multi-party protocols, safeguard of encryption schemes in addition to countermeasures and faults.

Additional info for Topics in Cryptology – CT-RSA 2009: The Cryptographers’ Track at the RSA Conference 2009, San Francisco, CA, USA, April 20-24, 2009. Proceedings

Example text

These values affect both the ciphertext expansion and the encryption time significantly, therefore they must be selected carefully.

For instance, ElGamal is key-private only by assuming that all keys are generated in the same group and participants share the same public parameters. But in many scenarios this is not the case. In PGP, for instance, parameters for each user are selected in distinct groups. Evidently, ElGamal applied in different algebraic groups is not anonymous anymore as one can test whether a given ciphertext is in a group or not. Our contributions are (1) We enhance Cocks IBE and make it universally anonymous, and thus keyprivate in the sense of Bellare et al.

Let (a, N ) be a pair such that (N, p, q) ← 2 R t +a ∗ ∗ :t← − ZN is computationally indistinguishZN [+1]. The distribution N able from the uniform distribution on {−1, +1} under the quadratic residuosity assumption. To prove the Lemma above it is enough to observe that if we compute the Jacobi symbol of a value c ∈ Sa [N ] we obtain: c N = (t2 + a)/t N = t2 + a N t N Universally Anonymous IBE Based on the Quadratic Residuosity 37 However the Jacobi symbol of t over N is the plaintext in Cocks IBE and thus Lemma 1 must follow otherwise the CPA-security of Cocks IBE would not hold.

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