Instruction Set Randomization

Instruction Set Randomization (ISR) is a technique that protects software by randomizing the instruction set architecture (ISA) of the processor or the virtual machine for each execution or each program instance. This means that the same code would be represented by different machine instructions each time, making it impossible for an attacker to create a static exploit or understand the code through standard disassembly.

ISR is a proactive defense mechanism that changes the very language the computer speaks. It is highly effective against code injection attacks and reverse engineering, as the attacker does not know the mapping between the instructions and their meanings.

While it requires hardware or virtual machine support to be efficient, it provides a very high level of security. In the context of secure financial systems, ISR could be used to protect critical components from being analyzed or exploited.

It is an advanced concept that is still largely in the research phase for general-purpose computing but has significant potential for specialized secure systems.