1. An apparatus comprising: a digest memory to store an isolated digest in a secure environment for an isolated execution mode, the secure environment being associated with an isolated memory area accessible by at least one processor, the at least one processor operating in one of a normal execution mode and the isolated execution mode; and an attestation key memory (AKM) device coupled to the digest memory to attest the isolated execution mode and prove validity of a program loaded into the isolated memory area using the isolated digest.