Cryptography – Particular algorithmic function encoding – Nbs/des algorithm
Patent
1988-07-27
1990-06-19
Tarcza, Thomas H.
Cryptography
Particular algorithmic function encoding
Nbs/des algorithm
380 29, 380 44, 380 45, 380 48, 380 49, H04L 908
Patent
active
049359614
ABSTRACT:
A method and apparatus for generating cryptographic keys for a postal manifest and for synchronizing cryptographic keys for transmitting postal data securely on a communication link is presented. The techniques for generating a key and for synchronizing keys use the same apparatus but use slightly different data to create a cryptographic key.
The postal data center maintains a unique set of data for each server station. Using this set of data along with a manifest sequence number (or communication transaction number) and the date, a cryptographic key is created. Each server station stores a fixed master key, KO, a permutation table, Pt, and ID, and GMT date. Using the manifest sequence number (or the communication transaction number) a row of the permutation table is altered and the master key KO is scrambled with the permutation table top get a new key K2. With K2, the date, server ID, and manifest sequence number (our communication transaction number) are encrypted. The result of this encryption yields another key K3. K3 is then used for encrypting the postal manifest or for communicating with a postal data center.
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D. Coppersmith, IBM J. Res. Develop., 2-87, pp. 244-248.
Gargiulo Joseph L.
Pastor Jose
Pitchenik David E.
Scolnik Melvin J.
Tarcza Thomas H.
Wallace Linda J.
Whisker Robert H.
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