Author

Zhengyue Zhao

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Preprint Aug 2026

Decomposition Attacks Across Unlinkable Identities: Limits of Stateful Defenses for LLM Services

It is proved that the achievable security and utility tradeoff depends entirely on how benign requests for the same capabilities are grouped, and that the achievable security and utility tradeoff depends entirely on how persistent, recognizable groups permit a useful defense.

Bowen Sun, Zhengyue Zhao, Xiaogeng Liu et al. · 1 citation

Preprint Aug 2026

KeyPooling: Measuring Where LLM API Relay Paths Collapse Prompt Cache Isolation

KeyPooling is presented, a measurement method that traces customer identity through cache lookup and write, verifies runtime transformations, and tests one predicted identity component at a time, and derives a defense contract.

Bowen Sun, Yixi Cai, Xiaogeng Liu et al. · 0 citations