By Daniel Bleichenbacher (auth.), Hugo Krawczyk (eds.)

This publication constitutes the refereed lawsuits of the 18th Annual overseas Cryptology convention, CRYPTO'98, held in Santa Barbara, California, united states, in August 1998. The booklet provides 33 revised complete papers chosen from a complete of a hundred and forty four submissions bought. additionally integrated are invited shows. The papers are equipped in topical sections on selected ciphertext defense, cryptanalysis of hash features and block ciphers, allotted cryptography, 0 wisdom, and implementation.

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Extra resources for Advances in Cryptology — CRYPTO '98: 18th Annual International Cryptology Conference Santa Barbara, California, USA August 23–27, 1998 Proceedings

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IND-CCA1⇒NM-CPA] If there exists an encryption scheme Π which is secure in the sense of IND-CCA1, then there exists an encryption scheme Π which is secure in the sense of IND-CCA1 but which is not secure in the sense of NM-CPA. Now one can ask whether non-malleability implies chosen ciphertext security. The following says it does not even imply the non-adaptive form of the latter. 4. Theorem 4. [NM-CPA⇒IND-CCA1] If there exists an encryption scheme Π which is secure in the sense of NM-CPA, then there exists an encryption scheme Π which is secure in the sense of NM-CPA but which is not secure in the sense of IND-CCA1.

Theorem 6 shows that PA (together with the RO version of IND-CPA) implies the RO version of IND-CCA2. In the other direction, Theorem 7 shows that the RO version of IND-CCA2 does not imply PA. 4 Definitional Contributions Beyond the implications and separations we have described, we have two definitional contributions: a new definition of non-malleability, and a refinement to the definition of plaintext awareness. The original definition of non-malleability [11,12,13] is in terms of simulation, requiring, for every adversary, the existence of some appropriate simulator.

Practical approaches to attaining security against adaptively chosen ciphertext attacks. In Advances in Cryptology–Crypto ’92, pages 292–304, 1992. 15 Relations Among Notions of Security for Public-Key Encryption Schemes Mihir Bellare1 , Anand Desai1 , David Pointcheval2 , and Phillip Rogaway3 1 Dept. of Computer Science & Engineering, University of California at San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA. edu/users/{mihir,adesai} 2 ´ Laboratoire d’Informatique de l’Ecole Normale Sup´erieure, 75005 Paris, France, and GREYC, D´ept d’Informatique, Universit´e de Caen, 14032 Caen Cedex, France.

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