Per-principal HMAC salts on LLM cache keys can block cross-tenant timing leaks, but the mechanism is already in vLLM and the paper's 0% success evidence is analytic, not from a deployed defense.
, author Sigmund, K
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Governing the KV Cache: Preventing Timing Side-Channel Leakage in Multi-Tenant LLM Inference
Per-principal HMAC salts on LLM cache keys can block cross-tenant timing leaks, but the mechanism is already in vLLM and the paper's 0% success evidence is analytic, not from a deployed defense.