Identity-Based Chameleon Hashing from the SIS Assumption in a Central Authority Model
Wen‐Chung Kuo, Dai-Rui Lin, Shi-Xun Chen
Hash functions play a fundamental role in cryptography, offering one-way and collision-resistant properties essential for digital security. Chameleon hashing, an extension of traditional hash functions, allows controlled collision generation using a private trapdoor, enabling various cryptographic applications such as online/offline digital signatures and commitment schemes. However, existing identity-based chameleon hash (IBCH) functions largely rely on number-theoretic assumptions, which are vulnerable to quantum attacks. To address this issue, we propose a novel IBCH function built upon post-quantum lattice-based cryptography. Specifically, our construction leverages the Short Integer Solution (SIS) problem to achieve quantum-resistant security guarantees. The proposed scheme enables identitybased key management, allowing users to generate hash values using public identity information while preserving the trapdoorcontrolled collision property. We rigorously analyze the security of our scheme, demonstrating its resistance against quantum adversaries under standard lattice assumptions. Furthermore, we compare our construction with existing functions in terms of computational efficiency and security, showing that our approach provides a feasible and secure alternative for post-quantum applications.
IEEE Conference on Dependable and Secure Computing (DSC)•Oct 18, 2025•0 citations