关键词: 匿名签密, 多接收者, 无证书, 不可伪造性, 公开验证性

Abstract:

Aiming at the problems of the ambiguity and disclosure of the receiver’s identity information in the broadcasting communication environment, a public verifiable certificateless multi-receiver anonymous signcryption scheme is proposed. The scheme uses the security parameters to complete the system initialization, generates the system’s master key and public parameters, and uses the key generation method combined with the user identity and the hash function to extract the public-private key pair of the user. In the signcryption process, the identity set of the receiver is hidden in the polynomial by Lagrangian interpolation, the ciphertext with the identity of the recipient is generated, the ciphertext is sent to the receiver to send the ciphertext verification, and receiving the legality of the two parties’ identity, and decrypting and outputting the correct plaintext after decryption. Under the random prediction model, the confidentiality, unforgeability, anonymity and public verification of the scheme are proved based on the discrete logarithm problem and the computational Diffie-Hellman problem. Finally, compared with several classical multi-receiver signcryption algorithms, the computational cost and security attributes are compared. The experimental results show that the proposed scheme has moderate computational cost and good security.

Key words: anonymous signcryption, multi-receiver, certificateless, unforgeability, public verification