A processing system has a processor that can operate in a normal ring 0
operating mode and one or more higher ring operating modes above the
normal ring 0 operating mode. In addition, the processor can operate in
an isolated execution mode. A memory in the processing system may include
an ordinary memory area that can be accessed from the normal ring 0
operating mode, as well as an isolated memory area that can be accessed
from the isolated execution mode but not from the normal ring 0 operating
mode. The processing system may also include an operating system (OS)
nub, as well as a key generator. The key generator may generate an OS nub
key (OSNK) based at least in part on an identification of the OS nub and
a master binding key (BK0) of the platform. Other embodiments are
described and claimed.