A cryptographic device is implemented in communication with a host processor to prevent the host processor from performing a standard boot-up procedure until a basic input output system (BIOS) code is authenticated. This is accomplished by a cryptographic device which is addressed by the host processor...http://www.google.de/patents/US6401208?utm_source=gb-gplus-sharePatent US6401208 - Method for BIOS authentication prior to BIOS execution
