## Advances in Cryptology - CRYPTO '89: ProceedingsCRYPTO is a conference devoted to all aspects of cryptologic research. It is held each year at the University of California at Santa Barbara. Annual meetings on this topic also take place in Europe and are regularly published in this Lecture Notes series under the name of EUROCRYPT. This volume presents the proceedings of the ninth CRYPTO meeting. The papers are organized into sections with the following themes: Why is cryptography harder than it looks?, pseudo-randomness and sequences, cryptanalysis and implementation, signature and authentication, threshold schemes and key management, key distribution and network security, fast computation, odds and ends, zero-knowledge and oblivious transfer, multiparty computation. |

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### Contents

Keying the German navys Enigma invited | 2 |

On the existence of bit commitment schemes and zeroknowledge proofs | 17 |

Problems with the normal use of cryptography for providing security | 30 |

Copyright | |

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### Common terms and phrases

addition chain Advances in Cryptology algorithm Alice applications assume assumption authentication path binary bit commitment blobs block cipher checksum ciphertext circuit collision commitment scheme complexity Computer Science construct CRYPTO cryptographic Cryptology cryptosystem decryption defined definition denote digital signature discrete logarithm efficient elements encryption scheme exists exponentiation finite gates given Goldreich IEEE implementation input integer interactive proof knowledge proofs Lemma length linear logarithmic signature machine master key matrix method Micali modulo non-interactive oblivious transfer one-way function one-way hash function output pair paper password permutation plaintext polynomial polynomial-time probabilistic probability problem Proc proof of knowledge proof system protocol prove pseudorandom public key quadratic randomly reduced result reveal s-boxes satisfies secret key secret sharing scheme sends sequence Shamir signature scheme simulator string subset tape Theorem threshold scheme transformations UNIX vector verifier zero zero-knowledge proofs