期刊名称：International Journal of Security and Its Applications
印刷版ISSN：1738-9976
出版年度：2015
卷号：9
期号：12
页码：405-418
DOI：10.14257/ijsia.2015.9.12.36
出版社：SERSC
摘要：In a conditional proxy re-encryption (C-PRE) scheme, a semi-trusted proxy can transform Alice's ciphertext into Bob's ciphertext without learning the underlying plaintext, if the ciphertext satisfies a certain condition. To achieve more fine-grained delegation on conditions, Fang, Wang and Ge introduced the notion of fuzzy conditional proxy re-encryption (FC-PRE), whereby the conditions is viewed a set of descriptive keywords. The proxy with a re-encryption key for a condition word set can convert a ciphertext encrypted with a condition word set , if and only if and are close to each other as measured by the "set overlap" distance metric. Nonetheless, they left an open problem on how to construct a non-interactive FC-PRE scheme. Furthermore, their scheme is only proved secure in the random oracle model. In this paper, we answer the above problems affirmatively by presenting a non-interactive fuzzy conditional proxy re- encryption scheme. Moreover, our scheme is proved secure without random oracles.
关键词：Proxy re-encryption; Conditional proxy re-encryption; Non-interactive; ; without random oracles
