Disclosed is a method and apparatus for updating an on-board clock device, for instance a clock that is embodied on a time-stamping cipher module, to compensate for individual deviation from an external time-source. Typically, a computer system, such as a network server, is in communication with a cryptographic...http://www.google.de/patents/US20020104004?utm_source=gb-gplus-sharePatent US20020104004 - Method and apparatus for synchronizing real-time clocks of time stamping cryptographic modules
