An enhanced information assurance system may comprise an improved computer including a central processing unit (CPU) emulator configured to extend the available machine instruction set. The CPU emulator may be configured to emulate machine language instructions taken from a nonnative set of secure opcodes. The CPU emulator may ensure that instructions and data in random access memory (RAM) remain encrypted at all times when in RAM, for example by storing the instructions and data in CPU registers when decrypted on an as-needed basis.