Another often-overlooked advantage is . When a key is compared from memory, the act of loading the key can cause observable cache timing variations, power draw fluctuations, or bus activity—vulnerabilities exploited in cache-timing attacks (e.g., Prime+Probe). However, if both keys are already loaded into registers (the "2 register key"), the comparison occurs entirely within the CPU’s ALU, never touching the cache hierarchy or external memory bus. This makes the operation much harder to spy on. In security-critical applications, the "2 register" method is not just better—it is a fundamental mitigation.
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