关键词: 区块链, 跨链, 身份认证, 无证书签密, 去中心化, 数字身份

Abstract: In response to the issues of low decentralization, poor scalability, and high resource consumption in the current blockchain cross-chain identity authentication mechanisms, a new cross-chain identity authentication scheme based on certificate-less signcryption (CLSC-CIA) was proposed. First, which utilized certificate-less signcryption (CLSC) to generate keys for cross-chain entities, encrypt communication, and perform identity authentication. Second, secret sharing was employed for decentralized key management in the distributed system. Finally, decentralized identities were utilized to establish the association between entity keys and cross-chain identities. By ensuring identity privacy and security, CLSC-CIA achieved cross-chain interactive identity authentication among different blockchain systems. Theoretical analysis and experimental results demonstrate that CLSC-CIA does not rely on centralized certificate authorities or third-party key management organizations, ensuring decentralization. The generated digital identities comply with the World Wide Web Consortium (W3C) standards, ensuring scalability. Furthermore, compared to the combination of ECC (Elliptic Curve Cryptography) and AES (Advanced Encryption Standard), CLSC-CIA achieves approximately a 34% reduction in time overhead. Moreover, compared to the combination of RSA (Rivest-Shamir-Adleman) and AES, it achieves approximately a 38% reduction in time overhead while maintaining decentralization for cross-chain interactive identity authentication. CLSC-CIA effectively enhances the decentralization, scalability, and interaction efficiency of cross-chain systems in practical applications.

Key words: blockchain, cross-chain, identity authentication, certificate-less signcryption, decentralization, digital identity