Cryptography – Communication system using cryptography – Time segment interchange
Patent
1993-05-13
1995-05-02
Swann, Tod R.
Cryptography
Communication system using cryptography
Time segment interchange
380 28, 380 44, H04K 106
Patent
active
054127297
ABSTRACT:
A cryptographic device and method provide a repertoire of mappings and associated inverse mappings between plaintext and ciphertext vectors. The plaintext is partitioned block-by-block, the block size being user-selectable, such as N characters. Each mapping maps between a pair of N-dimensional plaintext and ciphertext vectors. The mapping or associated inverse mapping is implemented by a matrix with N.times.N matrix elements, where each element is allowed to take on a range of L values. By permuting the matrix elements within their range, the repertoire has a size.perspectiveto.L.sup.N.times.N. This size is immense even for moderate values of N and L. The users select one mapping or associated inverse mapping among the repertoire for respectively effecting the encryption or decryption. A secret key shared between the users includes information about the selected mapping or associated inverse mapping and may include values of N and L. To an outsider not privy to the secret key, the task of exhaustive research in the repertoire is computationally infeasible, especially if N and L are not known. In the preferred embodiment, a pseudo-random vector that varies block-by-block is added as another component to the ciphertext vector. A quick computational method is also described.
REFERENCES:
patent: 5003597 (1991-03-01), Merkle
patent: 5010573 (1991-04-01), Musyck et al.
patent: 5016276 (1991-05-01), Matumoto et al.
patent: 5113444 (1992-05-01), Vobach
patent: 5261003 (1993-11-01), Matsui
Patent Cooperation Treaty (PCT) International Search Report, Jul. 5, 1994, by Officer Tod R. Swann, 4 pages.
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