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所属单位：计算机科学与技术学院/人工智能学院/软件学院

发表刊物：Int. J. Embedded Syst.

摘要：Conditional proxy broadcast re-encryption (CPBRE) enables a semi-trusted proxy to convert Alice's ciphertext satisfying a certain condition into a set of users' ciphertext. The proxy, however, cannot learn anything about the underlying plaintext. The traditional CPBRE schemes cannot support flexible control on conditions. In this paper, we present a new primitive named conditional proxy broadcast re-encryption with fine grain policy (CPBRE-FG). In a CPBRE-FG scheme, the re-encryption key is generated with an access tree, and the ciphertext is constructed under a set of descriptive conditions. The proxy can convert a ciphertext if and only if the set of conditions satisfies the access tree. We formalise the notion of CPBRE-FG and present an efficient CPBRE-FG scheme. Finally, we prove it against chosen-ciphertext attack (CCA) security in the random oracle model. © 2019 Inderscience Enterprises Ltd.

ISSN号：1741-1068

是否译文：否

发表时间：2019-01-01

合写作者：Sun, Maosheng,Ge, Chunpeng,王建东

通讯作者：方黎明