As shown in FIG. 5A, PEAD 200 includes logic circuitry 502, which may represent a central processing unit such as a microprocessor or a microcontroller, discrete logic, programmable logic, an application-specific integrated circuit (ASIC), or the like, for implementing encryption logic 300 of FIG. 2 and optionally decryption logic 402 of FIG. 4. [0074] Program/data memory 504 stores, among others,