Lattice-Based Certificateless Collaborative Signature Scheme for Post-Quantum Intelligent Computing and Network Systems

With the rapid development of quantum computing technology, traditional collaborative signature schemes based on RSA and elliptic curve cryptography face significant security challenges. This paper proposes a lattice-based certificateless collaborative signature scheme (L-CCS) to address the security and efficiency requirements of multi-party collaboration in intelligent computing and network systems. By leveraging lattice problems such as the Small Integer Solution and Learning With Errors, our scheme ensures post-quantum security. The L-CCS eliminates the need for a trusted Key Generation Center and a dedicated aggregator, enhancing decentralization and system robustness. Our construction achieves existential unforgeability under adaptive chosen-message attacks in the random oracle model. Furthermore, we provide a practical implementation optimized for large-scale data sharing, demonstrating sublinear scalability in signature size and computation time.