The Attribute Based Online/Offline signcryption for mobile devices
Di Jiang, Han Yiliang, Yang Xiaoyuan · 2016
Signcryption combines the functionalities of signature and encryption and costs less than the traditional approach; Online/Offline techniques can improve the efficiency of the signature and encryption, one motivating application for this technology is mobile devices. On the basis of Attribute-Based signature, an efficient attribute-based online/offline signcryption scheme is proposed in this paper, moreover, by using the scheme, an encryptor can encrypt data with hidden policy to achieve the privacy of the policy. This scheme is provable secure in the random oracle model and it satisfies indistinguishability against adaptive chosen ciphertext attack based on l-th Decisional Bilinear Diffie-Hellman Inversion(l-DBDHI)assumption and satisfies existential unforgeability against adaptive chosen message attack based on the standard Computational Diffie-Hellman(CDH) assumption. Although the size of ciphertext increases, the new scheme achieves not only confindentiality and authentication, but also which is more suitable for the practical applications.