Side-Channel Attack

Overview

Side-Channel Attack is an attack that infers secrets from implementation effects such as execution time, power use, electromagnetic emissions, cache behavior, memory access patterns, sound, or error differences. The attacker exploits information leaked by computation rather than directly breaking the mathematical security of the algorithm. It should be interpreted alongside Timing Attack, which may affect the same workflow without representing the same control, event, or risk.

Private keys, authentication values, cryptographic intermediates, and protected decisions may be inferred through repeated measurements, local access, shared hardware, or malicious code.

Organizations should use constant-time implementations, hardened libraries, isolation, blinding, noise-resistant designs, cache controls, secure hardware, and testing under realistic attacker capabilities.

Retain threat assumptions, hardware and software versions, measurement method, statistical results, affected secrets, mitigation test, library provenance, and residual risk decision.

Assessment of Side-Channel Attack should trace an attack that infers secrets from implementation effects such as execution time, power use, electromagnetic emissions, cache behavior, memory access patterns, sound, or error differences from prerequisite and entry point through observable impact on the affected service. A theoretical weakness or scanner result involving power use, electromagnetic emissions, and cache behavior should not be reported as exploitation without corroborating logs, transactions, or configuration evidence. Prevention, detection, containment, and recovery for the Side-Channel attack path should be tested against the architecture associated with power use, electromagnetic emissions, and cache behavior.

Retesting for Side-Channel Attack should reproduce the Side-Channel attack path involving power use, electromagnetic emissions, and cache behavior, examine adjacent paths, and verify the conditions for safely returning the affected service to normal operation.