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InfoResearchPeer-reviewed
CIBPU: A Conflict-Invisible Secure Branch Prediction Unit
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Summary
This paper proposes CIBPU, a conflict-invisible secure branch prediction unit (SBPU). It uses redundant storage, load-aware indexing, replacement design and an encryption mechanism without periodic key updates to keep branch conflicts hidden from attackers. In a gem5 RISC-V model the authors report an average performance overhead of 2.9%–4.0%, and on an FPGA board running SonicBOOM an average degradation of 2.01%.