An apparatus and method for synchronizing the time definition of the dynamic variables by (a) calculating a first non-predictable code according to a secret predetermined algorithm, the algorithm generating the first non-predictable code on the basis of a first dynamic variable and a unique static variable;...http://www.google.fr/patents/US4885778?utm_source=gb-gplus-shareBrevet US4885778 - Method and apparatus for synchronizing generation of separate, free running, time dependent equipment
Method and apparatus for synchronizing generation of separate, free running ...
