Functional encryption with efficient verifiable outsourced decryption for secure data access control in social network
by Cong Li; Xiaoyuan Yang; Yudong Liu; Yunfei Cao
International Journal of High Performance Systems Architecture (IJHPSA), Vol. 8, No. 1/2, 2018

Abstract: For social network, the user's data streams needs to be securely shared. Attribute-based functional encryption (ABFE) implements fine-grained access control for sensitive data and implements different functional encryption systems with multiple access policies. Attribute-based functional encryption, as a new type of encryption scheme, whose user private key and ciphertext are associated with attributes, is very suitable for data security sharing and fine-grained access control in social network environments. However, the main disadvantages of the attribute-based functional encryption are that the size and decryption time of the ciphertext increase in the complexity of the access formula. In order to reduce the burden of decryption for users, this paper proposed to outsource the computation of functional encryption to cloud server, by providing a transformation key, we show how a user can provide a single transformation key to the cloud, which enables the cloud to convert any ABE ciphertext into a (constant-size) ElGamal-style ciphertext, at the same time through the efficient verification to ensure the correctness of the outsourcing computing. It saves a lot of bandwidth and decryption time for users without increasing the number of transfers data streams.

Online publication date: Fri, 17-Aug-2018

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