Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1993-12-20
1995-05-16
Gregory, Bernarr E.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 1, 380 9, 380 28, 380 44, 380 49, 380 21, H04L 906, H04L 914, H04L 900
Patent
active
054168414
ABSTRACT:
A cryptographic system includes a conventional DES facility for encrypting data using a key of N (=56) bits. The user however need only supply a first key of n bits, which is passed to a key management system. The key management system generates a second key of length N-n bits, which is combined with the first key to produce a full-length key of N bits. This full-length key is then passed to the DES facility to allow data to be encrypted and saved in a data store in the conventional manner. The value of n can be controlled such that if the user forgets the first key, it can be located in a reasonable time on a simple trial and error basis, thereby allowing retrieval of the encrypted data.
REFERENCES:
patent: 4935961 (1990-06-01), Gargiulo et al.
IBM TDB, vol. 33, No. 9, Feb. 1991, pp. 195-198, "Cryptographic Initialization Test" (the whole document).
Proceedings 25th Annual 1991 IEEE International Carnahan Conference on Security Technology, 1-3 Oct. 1991, Taipei, Taiwan; pp. 59-67; K. J. Fram et al. "An Authenticate Processing for the Information System in Industrial Technology Research Institute", p. 60, left col., line 1--line 34; table 1.
C. C. Foster, Cryptanalysis for Microcomputers; (Hayden Book Co.; Rochelle Park, N.J.; 1982; pp. 223-224).
T. Beth, Lecture Notes in Computer Science (149); (Springer-Verlag; 1983; pp. 235-255).
FIPS Publication 46-1, ANS X3.92-1981/R1987; (U.S. Govt. Printing Office, 1988).
Gregory Bernarr E.
Hoel John E.
International Business Machines - Corporation
Seaman Kenneth A.
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