Enterprise financial data encryption and traceability technology based on improved SM4 algorithm

In the era of rapidly developing digital economy, the security of enterprise financial data is crucial. To meet the security and traceability requirements of financial data for enterprises, an improved SM4 algorithm combining Feistel network structure, dynamic key generation, and smart contract technology is proposed and integrated with blockchain technology to form the Blockchain-SM4 model. The experimental results show that the average encryption time of this model is 3.06 seconds, which is significantly shorter than the secure blockchain model (5.02 seconds); The Central Processing Unit usage remains stable at 22.07%, with low computational resource consumption. In practical applications, when processing 10MB of data, encryption only takes 2.37s and can fully resist differential attacks and side channel attacks, with a traceability accuracy of 100%. This model can efficiently and securely encrypt and trace enterprise financial data. This study provides a new technology for improving data security and management efficiency.