Cryptography

Download Advances in Cryptology - CRYPTO 2009: 29th Annual by Shai Halevi PDF

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By Shai Halevi

This booklet constitutes the refereed court cases 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 study facets of cryptology, cryptography, and cryptanalysis in addition to complex purposes, 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 global, 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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Additional resources for Advances in Cryptology - CRYPTO 2009: 29th Annual International Cryptology Conference, Santa Barbara, CA, USA, August 16-20, 2009, Proceedings (Lecture ... Computer Science Security and Cryptology)

Example text

Specifically, in their attack the adversary requests the top n/3 bits of P . This was later improved by Maurer [26] who showed that n questions are sufficient, for any constant > 0. Canetti et al. [6] introduced the notion of exposure resilient cryptographic primitives, which remain secure even if an adversary is able to learn almost all of the secret key of the primitive. Most notably, they introduced the notion of an exposure resilient function: a deterministic function whose output appears random even if almost all the bits of the input are known (see also the work of Dodis et al.

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.

Typically, these messages are used as encryption keys for a symmetric-key encryption scheme, which in turn encrypts the actual plaintext. In this setting, hash proof systems may be viewed as keyencapsulation mechanisms in which ciphertexts can be generated in two modes. Ciphertexts generated using the first mode are referred to as valid ciphertexts, and are indeed encapsulations of symmetric keys. That is, given a public key and a valid ciphertext, the encapsulated key is well defined, and can be decapsulated using the secret key.

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