Abstract: A single-chip integrated circuit comprising a first processor for executing a plurality of applications, a second processor for executing a plurality of applications, at least one of a) at least one embedded peripheral and b) at least one memory, and a bus monitor for allowing access to the at least one of a) the at least one embedded peripheral and b) the at least one memory, if the access is allowed, wherein the bus monitor comprises a mapping of access rights to the at least one of a) the at least one embedded peripheral and b) the at least one memory for the first processor and the second processor is disclosed.

Abstract: A method for securely exchanging public key certificates in an electronic device (400) using a single or dual level of public key includes obtaining a replacement public key certificate (401) to replace an original public key certificate. The replacement public key certificate is signed (403) using the private key of the original public key certificate. The signature of the original public key certificate is validated (407) and the replacement public key certificate is written to memory where the original public key certificate cannot again be used as a default. Thus, the method of the invention uses either a single signature or combination of double signatures to permit transfer of signing authority to an independent third party. Once the original secondary public key is overwritten, the manufacturer's original secondary public key may no longer be used and the process is irreversible.