The Rad-T ASM reference design is a radiation tolerant version of the terrestrial ASM module. The Rad-T ASM design supports the requirement sets of the Crypto Modernization Initiative, HAIPIS encryptor equipment, and the Joint Tactical Radio System (JTRS). Rad-T ASM reference design hardware and software technology is suitable for embedment in a wide range of End Crypto Units (ECUs) and address additional requirements necessary for operation in radiation harsh environments. ASM’s innovative architecture permits straightforward evaluation and simplifies incorporation of design variants. Maximum use of COTS technology and components mitigates technology obsolescence risks. ASM supports 100% field re-programmability for all firmware, software, key management, and crypto control algorithms. One-time programmable capability is also supported.