关键词: 组合公钥, 身份认证, 密钥碰撞, 双线性对, SM9算法

Abstract: The key collision exists in the identification key generation process of the existing combinatorial public key CPK server, resulting in identification errors in terminal identity authentication, the confidentiality and integrity of the data in the process of the authentication system are destroyed. A new solution to solve the problem of combination public key collision is proposed, effectively solve the problem of identity between terminals that appear in the authentication process. The proposed scheme uses SM9 algorithm based on bilinear pairing to solve the key collision problem,it proves that the scheme has strong security and high efficiency, through theoretical analysis and security comparison.

Key words: combined public key, identity authentication, key collision, bilinear pairing, SM9 algorithm