Advances in Cryptology - CRYPTO 2009: 29th Annual - download pdf or read online

By Shai Halevi

ISBN-10: 3642033555

ISBN-13: 9783642033551

This e-book constitutes the refereed court cases of the twenty ninth Annual foreign 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 features 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)

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Let h = g1x1 g2x2 , and output the keys SK = (x1 , x2 ) , P K = (g1 , g2 , h) . – Encryption: On input a message M , choose r ∈ Zq and s ∈ {0, 1}t uniformly at random, and output the ciphertext (g1r , g2r , s, Ext(hr , s) ⊕ M ) . – Decryption: On input a ciphertext (u1 , u2 , s, e), output e ⊕ Ext(ux1 1 ux2 2 , s). 2. Assuming the hardness of DDH, the above encryption scheme is semantically-secure against (L/2 − ω(log n) − m)-key-leakage attacks, where n denotes the security parameter, L = L(n) denotes the length of the secret key and m = m(n) denotes the length of the plaintext.

In Section 2 we present several notions and tools that are used in our constructions. In Section 3 we formally describe the framework of key-leakage attacks. In Section 4 we present our generic construction from hash proof systems, and provide a simple and efficient instantiation. In Section 5 we present our two proposals that are resilient to any key leakage of L(1 − o(1)) bits, and provide a comparison between them. In Section 6 we present several generalizations of the framework considered in this paper that are satisfied by our schemes.

Unfortunately, this idealized assumption is often hard to satisfy in real systems. In S. ): CRYPTO 2009, LNCS 5677, pp. 36–54, 2009. © International Association for Cryptologic Research 2009 Leakage-Resilient Public-Key Cryptography in the Bounded-Retrieval Model 37 many situations, the attacker might get some partial information about secret keys through means which were not anticipated by the designer of the system and, correspondingly, not taken into account when arguing its security. Such attacks, referred to as key-leakage attacks, come in a large variety.

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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) by Shai Halevi


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