ZHANG Yulei① ZHANG Linggang① WANG Caifen① MA Yanli① ZHANG Yongjie②
①(College of Computer Science and Engineering, Northwest Normal University, Lanzhou 730070, China) ②(Gansu Health Vocational College, Lanzhou 730000, China)
Abstract:In order to ensure the confidentiality and authentication in different network environments, the security model of IDPKC-to-CLPKC heterogeneous signcryption is defined from IDentity-based Public Key Cryptography (IDPKC) to CertificateLess Public Key Cryptography (CLPKC), and a concrete IDPKC-to-CLPKC heterogeneous signcryption scheme is presented. The system parameters in IDPKC and CLPKC are independent on each other in the scheme, which can meet the practical requirements. Based on the assumptions of Gap Bilinear Diffie-Hellman (GBDH), Computational Diffie-Hellman (CDH) and q-Strong Diffie-Hellman (q-SDH), the scheme is proved to satisfy the confidentiality and unforgeability in the random oracle model. Moreover, the scheme is also proved to satisfy the properties of ciphertext anonymity, which means the attacker can not judge the identities of the sender and the receiver. Therefore, the scheme can effectively protect the privacy of both identities.
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