Download Advances in Cryptology — CRYPTO '98: 18th Annual by Daniel Bleichenbacher (auth.), Hugo Krawczyk (eds.) PDF

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

This e-book constitutes the refereed lawsuits of the 18th Annual foreign Cryptology convention, CRYPTO'98, held in Santa Barbara, California, united states, in August 1998. The e-book provides 33 revised complete papers chosen from a complete of a hundred and forty four submissions acquired. additionally incorporated are invited displays. The papers are geared up in topical sections on selected ciphertext protection, cryptanalysis of hash features and block ciphers, disbursed cryptography, 0 wisdom, and implementation.

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

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In Advances in Cryptology–Crypto ’97, 1997. 18 A Practical Public Key Cryptosystem Provably Secure 25 6. D. Boneh and R. Venkatesan. Hardness of computing the most significant bits of secret keys in Diffie-Hellman and related schemes. In Advances in Cryptology– Crypto ’96, pages 129–142, 1996. 17 7. R. Canetti, O. Goldreich, and S. Halevi. The random oracle model, revisted. In 30th Annual ACM Symposium on Theory of Computing, 1998. To appear. 15 8. I. Damgard. Towards practical public key cryptosystems secure against chosen ciphertext attacks.

Dk . For 1 ≤ i ≤ k, we have di = g1yi1 g2yi2 , where yi1 and yi2 are random elements of Zq included in the secret key. When encrypting, we compute k v = cr dai i r , i=1 and when decrypting, we verify that x1 + v = u1 k i=1 ai yi1 x2 + u2 k i=1 ai yi2 . Using the same proof techniques as for the basic scheme, it is straightforward to prove that this modified version is secure against adaptive chosen ciphertext attack, assuming the Diffie-Hellman decision problem in G is hard. 4 A “lite” Version Secure Against Lunch-Time Attacks To achieve security against lunch-time attacks only, one can simplify the basic scheme significantly, essentially by eliminating d, y1 , y2 , and the hash function H.

Given a non-malleable encryption scheme Π = (K, E, D) we define a new encryption scheme Π = (K , E , D ) as follows. Here b is a bit. Algorithm Epk Algorithm K (1k ) (pk, sk) ← K(1k ) y ← Epk (x) u, v ← {0, 1}k return 0 y pk ← pk u sk ← sk u v return (pk , sk ) u (x) Algorithm Dsk u v (b y) if b = 0 then return Dsk (y) else if y = u then return v else if y = v return sk else return ⊥ Analysis. The proof of Theorem 4 is completed by establishing that Π is vulnerable to a IND-CCA1 attack but remains NM-CPA secure.

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