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 learn facets of cryptology, cryptography, and cryptanalysis in addition to complex functions, the papers are equipped 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 resources for Advances in Cryptology - CRYPTO 2009: 29th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2009. Proceedings
Bounded-Retrieval Model (BRM). Here we assume that there is an external natural bound on the overall amount of information the attacker can learn throughout the lifetime of the system, particularly concentrating on the setting when can be extremely large. For example, the attacker may be able to repeatedly perform many side-channel attacks, each of which reveals a few bits of information about the key but, if the bandwidth of such attacks is relatively small, it may be infeasible, too time consuming, or simply not cost-affective for the adversary to learn “too much” information (say, more than 10 megabytes) overall.
Speciﬁcally, in the attack of Halderman et al.  the adversary learns a noisy version of all of the memory, and it is rather likely that intermediate values from the generation of the keys are not always completely erased. This motivates a natural generalization that allows the adversary to learn functions of the random bits that are used by the key generation algorithm. Encryption schemes that satisfy this notion of security are more robust to leakage in the sense that the key generation algorithm does not have to make sure that all intermediate key-related values have been deleted.
The schemes resulting from the Naor-Yung paradigm are rather ineﬃcient due to the usage of generic non-interactive zero-knowledge proofs. To complement this situation, on the practical side, we prove that variants of the Cramer-Shoup cryptosystem  (along the lines of our generic transformation from hash proof systems) are CCA1-secure with any leakage of L(1/4 − o(1)) bits, and CCA2secure with any leakage of L(1/6 − o(1)) bits. It is left as an open problem to construct a practical CCA-secure scheme that is resilient to any leakage of L(1 − o(1)) bits (where a possible approach is to examine recent reﬁnements of the Cramer-Shoup cryptosystem [1,22,25]).