1. A first computing machine that is a first instance of a first computing platform, the first computing platform having a second computing machine as a second instance, the first computing machine comprising: a processor; a cryptographic co-processor coupled to the processor; and a Basic Input/Output System (BIOS) coupled to the processor to initialize the cryptographic co-processor with, at least one machine-specific key having a value specific to the first computing machine such that data encrypted using said machine-specific key can only be decrypted on said first computing machine, and at least one platform-specific key having a value specific to the first computing platform such that data encrypted using said platform-specific key can be decrypted on said first computing machine and on said second computing machine but not on any computing machine that is not an instance of said first computing platform.