An Effective Security Enhancement Scheme for Postquantum Cryptography Based Blockchain Networks in Cloud Computing

Lattice-based cryptography is widely embraced for its strong security and versatility, particularly in postquantum public key (PK) systems. The incorporation of an aggregate signature scheme consolidates numerous signatures into a concise cryptographic signature, thereby enhancing verifiability. However, traditional methods encounter security vulnerabilities as quantum computing capabilities evolve, resulting in performance challenges for real-time and resource-intensive applications. This research introduces a solution, called postquantum cryptography and the enhancement of identity encryption (PQCEIE), aimed at addressing blockchain security by leveraging the round optimal lattice-based multisignature scheme (ROLMSS) against quantum attacks. The study significantly enhances efficiency in terms of time and storage, with reduced overall complexity. It achieves minimal encryption time (5 ms), decryption times (4.9 ms), key generation (80 ms) for 16 attributes, and execution time (0.07s) compared to conventional approaches.