A Quantum-Resistant Blockchain Based on Hash Functions

With the advancement of quantum computing, traditional blockchain security is facing significant threats. Hash functions, digital signatures, and consensus mechanisms are all vulnerable to quantum algorithm attacks. In order to enhance the data security of blockchains, this paper explores the utilization of quantum cryptography to strengthen their resistance against quantum threats. Firstly, this paper analyzes two main forms of attacks by quantum computing on classical blockchains. Secondly, in order to counter Grover’s algorithm’s attack on hash functions, a quantum-walk-based hash function inspired by quantum principles is designed. Subsequently, to address Shor’s algorithm’s attacks on digital signatures and consensus mechanisms, a novel quantum-resistant blockchain architecture is proposed. Finally, the security and effectiveness against quantum threats of this scheme are validated through experiments. Experimental results demonstrate that the proposed scheme can effectively resist quantum attacks while maintaining good block packaging performance. Thus offering a new solution for blockchain security.