Apparatus and method for effecting a key change via a cryptograp

Cryptography – Particular algorithmic function encoding – Nbs/des algorithm

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380 25, 380 44, 380 47, H04L 902

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046882502

ABSTRACT:
Messages sent from an earth station to a satellite by a command link are authenticated within the satellite before being executed. Authentication is accomplished by comparing a codeword appended to the message to a codeword generated within the satellite. This codeword is a cryptographic function of the message data and a secret operating key. A key change command from the earth station causes the satellite authenticator to generate a new operating key based a secret master key, a supplemental private code, and a publicly available initialization vector. The codeword appended to the key change command is encrypted in the new key and, if it agrees with a codeword generated by the satellite authenticator, the new key becomes the operating key and the key change function is complete.

REFERENCES:
patent: 4202051 (1980-05-01), Davida et al.
patent: 4423287 (1983-12-01), Zeidler
patent: 4460922 (1984-07-01), Ensinger et al.
patent: 4484027 (1984-11-01), Lee et al.
Federal Information Processing Standards Publication 46 "Data Encryption Standard", Jan. 15, 1977.
Federal Information Processing Standards Publication 81 "DES Modes of Operation", Dec. 2, 1980.
Federal Information Processing Standards Publication 74 "Guidelines for Implementing and Using the NBS Data Encryption Standard", Apr. 1, 1981.

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