Abstract: A method and apparatus for memory tagging for object reuse protection which includes a central processing unit (CPU), a memory for storing a data word object and a corresponding tag identifying a first process with a first identification (ID). The memory means is coupled to the CPU. A subject ID register for storing a current process ID for a current process is coupled to the CPU and the memory. Tag checking apparatus for comparing the current process ID to the first ID is coupled to the CPU, to the subject ID register, and to the memory. Control logic is coupled to the CPU, to the memory, and to the tag checking apparatus. The control logic is for denying access to the data word object by the current process if the current process ID does not match the first ID.

Abstract: A method and apparatus for providing error detection, correction and prevention of unauthorized access to data using memory tags. The method and apparatus includes computing an original error detection/correction code associated with a data word. The original error detection/correction code, using a CPU and a subject identification register, is copied to a tag associated with the data word when an original subject writes the data word into a memory. A single-error-correction/double-error detection (SEC/DED) device applies a first bias to the tag to create a first-biased error detection/correction code when the memory is assigned to a first subject. The SEC/DED device applies a second bias to create a twice-biased error detection/correction code when a second subject attempts to access the data word. Access to the data word is denied if the twice-biased error detection/correction code comprises an uncorrectable error.