Method for authenticating communications participants, system for application of the method and first communications participant and second communication participant for application in the system
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United States of America Patent
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Jun 28, 1994
Grant Date -
N/A
app pub date -
Oct 23, 1992
filing date -
Oct 25, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Known methods for authenticating communication participants add a code word to a command signal, which code word is a crytographic function of the command signal and a key value which in its turn is a function of a master key value and a change code word. The master key value has a permanently fixed value, in contrast to the change code word which serves to change the key value. The method according to the invention makes use of a key value which is a function of at least one previous key value, the master key value with the permanently fixed value, which, once it has been discovered or leaked, substantially weakens the encryption, no longer being required.
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