Intel Secure Key, was previously code-named Bull Mountain Technology. It is the Intel name for the Intel 64 and IA-32 Architectures instruction RDRAND and its underlying Digital Random Number Generator (DRNG) hardware implementation. Among other things, the DRNG using the RDRAND instruction is useful for generating high-quality keys for cryptographic protocols.
Here is a handy link to my My Intel vPro Knowledge Base
Previously refered to as "Bull Mountain", the RdRand instruction will present itself on the upcoming "Ivy Bridge" platform coming out early 2012. The RdRand instruction paves the way to fast, reliable entropy generated on the processor resulting in highly robust random numbers!