US Patent 11074198 Key management in computer processors

Systems, apparatuses, and methods related to a computer system having a processor and a main memory storing scrambled data are described. The processor may have a secure zone configured to store keys and an unscrambled zone configured to operate on unscrambled data. The processor can convert the scrambled data into the unscrambled data in the unscrambled zone using the keys retrieved from the secure zone in response to execution of instructions configured to operate on the unscrambled data. Another processor may also be coupled with the memory, but can be prevented from accessing the unscrambled data in the unscrambled zone.