Advances in Cryptology — CRYPTO ’91: Proceedings by M. Abadi, M. Burrows, B. Lampson, G. Plotkin (auth.), Joan

By M. Abadi, M. Burrows, B. Lampson, G. Plotkin (auth.), Joan Feigenbaum (eds.)

Crypto '91 was once the 11th in a sequence of workshops on cryptology sponsoredby the foreign organization for Cryptologic study and used to be held in Santa Barbara, California, in August 1991. This quantity features a complete paper or a longer summary for every of the 39 talks offered on the workshop. All theoretical and sensible features of cryptology are represented, together with: protocol layout and research, combinatorics and authentication, mystery sharing and data idea, cryptanalysis, complexity conception, cryptographic schemas in response to quantity concept, pseudorandomness, functions and implementations, viruses, public-key cryptosystems, and electronic signatures.

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It can be ueed to establish the eecurity of the protocob. 1 Introduction A fair amount of research is devoted to developing cryptographic systems that are as secure aa possible. Unfortunately, this is not sufficient: if a cryptographic system is used in an incorrect protocol, security can be compromised even if the cryptographic system is perfect. In the literature, the analysis of the security of the protocols is often strongly linked to the particular structure of the used cryptosystem ( p 0 0 8 8 , Dam87, EGS861).

1 In the case of the above example ( 6 ) , each instantiation of the variables kl,ka,%I, %a leads to an equivalence class which contains three belief states corresponding to the three poesible instantiations of 2.. If the encryption of mi under ki is equal I - to SV(z’), the constraint is characteristic of the class of the belief state Be given in (7) and can be added to the state of knowledge (6), but if this encryption is not equal to SV(r’), the constraint is characteristic of the class of Be.

This innovative approach enables better comparison of protocols, often revealing critical weaknesses or possible improvements, aa was successfully done for several protocols in [5] and in subsequent works. However, the proofs of security obtained using this logic depends on assumptions which concern the protocol itself, not only the specific cryptosystem. Furthermore, the assumptions and the analysis view the cryptographic primitive (cryptosystem) as secure in a very idealized sense which is obviously much stronger than that of any candidate cryptosystem, our approach is to try to quantify the relationship between the cryptosystem and the protocol in a complexity-theoretic sense.

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