By Nadia Heninger, Hovav Shacham (auth.), Shai Halevi (eds.)
This e-book constitutes the refereed complaints of the twenty ninth Annual overseas Cryptology convention, CRYPTO 2009, held in Santa Barbara, CA, united states in August 2009.
The 38 revised complete papers awarded have been rigorously reviewed and chosen from 213 submissions. Addressing all present foundational, theoretical and examine points of cryptology, cryptography, and cryptanalysis in addition to complex purposes, the papers are prepared in topical sections on key leakage, hash-function cryptanalysis, privateness and anonymity, interactive proofs and zero-knowledge, block-cipher cryptanalysis, modes of operation, elliptic curves, cryptographic hardness, merkle puzzles, cryptography within the actual international, assaults on signature schemes, mystery sharing and safe computation, cryptography and game-theory, cryptography and lattices, identity-based encryption and cryptographers’ toolbox.
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Extra info for Advances in Cryptology - CRYPTO 2009: 29th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2009. Proceedings
Introduced a new computational assumption that is a generalization of learning parity with noise, and constructed symmetric-key encryption schemes that are resilient to any key leakage that is exponentially hard to invert. 24 M. Naor and G. Segev In a concurrent and independent work, Tauman Kalai and Vaikuntanathan  considered leakage of hard-to-invert functions in the setting of public-key encryption. Their main result is that the circular-secure encryption scheme of Boneh et al. 2 as a speciﬁc instantiation of our generic approach), but also when the leakage function is exponentially hard to invert.
Our AKA protocol can be used as an interactive encryption scheme with qualitatively stronger privacy guarantees than non-interactive encryption schemes (constructed in prior and concurrent works), which are inherently insecure if the adversary can perform leakage attacks after seing a ciphertext. Moreover, our schemes can be flexibly extended to the Bounded-Retrieval Model, allowing us to tolerate very large absolute amount of adversarial leakage (potentially many gigabytes of information), only by increasing the size of the secret key and without any other loss of efficiency in communication or computation.
Subset membership problem. As a computational problem we require that the subset membership problem is hard in HPS, which means that for random Public-Key Cryptosystems Resilient to Key Leakage 27 valid ciphertext C0 ∈ V and random invalid ciphertext C1 ∈ C \ V, the two ciphertexts C0 and C1 are computationally indistinguishable. This is formally captured by deﬁning the advantage function AdvSM HPS,A (n) of an adversary A as AdvSM HPS,A (n) = PrC0 ←V [A(C, V, C0 ) = 1] − PrC1 ←C\V [A(C, V, C1 ) = 1] , where C and V are generated using Param(1n ).
Advances in Cryptology - CRYPTO 2009: 29th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2009. Proceedings by Nadia Heninger, Hovav Shacham (auth.), Shai Halevi (eds.)