Apparatus and method for effecting a key change via a cryptographically protected link
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United States of America Patent
Stats
-
Aug 18, 1987
Grant Date -
N/A
app pub date -
Jan 29, 1986
filing date -
Jan 29, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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