Showing papers on "Block cipher published in 1982"

Cipher Systems: The Protection of Communications

Abstract: Some early cipher systems -- More recent mechanical cryptographic devices -- A theoretical approach to cryptography -- Practical security -- Linear shift registers -- Non-linear algorithms -- Some block cipher systems -- Applying cipher systems -- Speech security systems -- Public key cryptography.

Cryptanalysis of the data encryption standard by the method of formal coding

Abstract: The "Method of Formal Coding" consists in representing each bit of a DES ciphertext block as an XOR-sum-of-products of the plaintext bits and the key bits. Subsequent introduction of the "MFC-complexity measure" yields interesting results on the security of the DES and the influecce of various parameters.

On the cryptanalysis of rotor machines and substitution - permutation networks

Abstract: A general cryptanalysis method is presented based on statistical estimation theory. It is applied to two systems of practical interest: rotor machines and substitution-permutation networks. To cryptanalyze these systems, the finite keyspace is imbedded in a continuous set and the key estimate is a proper quantization of the continuous maximum likelihood estimate. Promising cryptanalysis results of a rotor machine under a ciphertext only attack and a substitution-permutation network under a known plaintext attack are presented.