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...http://www.google.fr/patents/US5325434?utm_source=gb-gplus-shareBrevet US5325434 - Method for authenticating communications participants, system for application of the method and first communications participant and second communication participant for application in the system
Method for authenticating communications participants, system for ...
