What is the difference between NGSCB and per-processor serial numbers?
A per-processor serial number (or ID) is a piece of unique state that can be read by any application with access to the processor. The content of the ID is revealed to anyone requesting it, and there is no way to hide the ID or use an indirect identity. More important, users cannot control which software can have access to the per-processor ID. A key design principle of NGSCB is that no processor or user identification is enabled without the user’s permission. In addition, nexus-enabled PCs will give users in-depth control of any such use or disclosure. A corollary is that users may choose to run nexus-aware software that hides or renders anonymous any identity (in most circumstances but not all; for example, users will probably always want their bank to be certain of who they are). To understand the difference between the NGSCB architecture and a per-processor serial number, it is first necessary to look at what unique, per-machine state exists in a PC with NGSCB. One of the component
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