The rapid development of e-commerce has led to a significant increase in the risk of sensitive data leakage, such as user transaction records, payment details, and identity information. Information security issues are becoming increasingly severe, especially in scenarios that rely on centralized cloud storage architectures, facing core challenges such as single point of failure leakage risks, lack of fine-grained access control in cross organizational data sharing, high encryption computing costs, rigid existing access control policies, and the contradiction between privacy protection and data sharing efficiency. In view of this, research has proposed and validated an innovative solution that integrates blockchain technology. Specifically, the study proposes a data security protocol based on attribute proxy re encryption and a data security sharing model based on blockchain. The data security protocol adopts ciphertext policy attribute encryption and introduces attribute proxy re encryption technology to re encrypt ciphertext through proxy nodes, solving the privacy protection problem of data transmission and sharing. The data security sharing model utilizes blockchain to store shared data, designs detailed access control policies and data encryption and decryption control mechanisms, and constructs a data security sharing system under a multi-layer architecture. In the experimental section, a simulated attack environment was constructed to test data security protocols. The results showed that compared with protocols such as SRAAP, TEE Oracle, Pedersen link Schnorr, etc., the blockchain data sharing protocol designed in this study achieved a ‘high’ level in terms of resistance to 51% attacks and resistance to general attacks (better than the ‘medium’ level of SRAAP protocol). The encryption time for privacy identity data was only 2.84ms (lower than SRAAP’s 5.20ms and TEE Oracle’s 7.46ms), and the maximum encryption time was controlled at 32ms. When processing a large amount of private data, the indexing time of the encryption control algorithm did not exceed 0.4 seconds, far lower than B-SEM algorithm’s 0.79s and CAB algorithm’s 0.91s. Moreover, the average memory occupation of the research scheme was only 18.54%, significantly lower than F-SEM algorithm. In the verification of blockchain data sharing platforms, compared with data sharing schemes such as BDAE, BF, RAISE, etc., the data control error rate of the research model does not exceed 3%, the accuracy of privacy data transmission is close to 95%, the data search and encryption performance is excellent (average search time of 1.35ms, shortest encryption time), and the access control cost is lower than other models. The research method combines blockchain technology and attribute proxy re encryption technology to effectively improve the privacy protection and control performance of shared data. It is significantly better than existing mainstream solutions in terms of computing efficiency, resource consumption, security strength, and control accuracy, effectively solving the inherent defects of centralized cloud storage, providing enhanced privacy protection, access control, and secure sharing capabilities for e-commerce data, ensuring data integrity and confidentiality, and reducing the threat risk of privacy sensitive data.
Ya You (Tue,) studied this question.