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arXiv · 2509.00104

Enhanced R\'{e}nyi Entropy-Based Post-Quantum Key Agreement with Provable Security and Information-Theoretic Guarantees

Ruopengyu Xu·Chenglian Liu
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Abstract

This paper presents an enhanced post-quantum key agreement protocol based on R\'{e}nyi entropy, addressing vulnerabilities in the original construction while preserving information-theoretic security properties. We develop a theoretical framework leveraging entropy-preserving operations and secret-shared verification to achieve provable security against quantum adversaries. Through entropy amplification techniques and quantum-resistant commitments, the protocol establishes $2^{128}$ quantum security guarantees under the quantum random oracle model. Key innovations include a confidentiality-preserving verification mechanism using distributed polynomial commitments, tightened min-entropy bounds with guaranteed non-negativity, and composable security proofs in the quantum universal composability framework. Unlike computational approaches, our method provides information-theoretic security without hardness assumptions while maintaining polynomial complexity. Theoretical analysis demonstrates resilience against known quantum attack vectors, including Grover-accelerated brute force and quantum memory attacks. The protocol achieves parameterization for 128-bit quantum security with efficient $\mathcal{O}(n^{2})$ communication complexity. Extensions to secure multiparty computation and quantum network applications are established, providing a foundation for long-term cryptographic security.

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Ruopengyu Xu, Chenglian Liu. 2025-08-28. Enhanced R\'{e}nyi Entropy-Based Post-Quantum Key Agreement with Provable Security and Information-Theoretic Guarantees. https://arxiv.org/abs/2509.00104

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