期刊名称：International Journal of Security and Its Applications
印刷版ISSN：1738-9976
出版年度：2014
卷号：8
期号：4
页码：161-170
DOI：10.14257/ijsia.2014.8.4.15
出版社：SERSC
摘要：Proxy re-encryption (PRE) can be classified as single-hop PRE and multi-use PRE according to the times which the ciphertext is transformed. Finding a unidirectional, multi- use, and chosen ciphertext attack (CCA) secure PRE is presented as an open problem by Canetti et al. Wang claimed to resolve this problem by proposing the first multi-use CCA- secure unidirectional PRE scheme. But Zhang et al. have shown their proposal is not CCA- secure by giving concrete attacks. In this paper, we propose an improvement for Wang-Multi- Use-PRE to resist Zhang's attack. But we also found that different with single-hop PRE, multi-use PRE without randomize encrypt key in its re-encryption algorithm could be vulnerable to attack. According to this principle we find a new type attack to multi-use CCA- secure PRE named proxy bypass attack. Then we give concrete attacks on Wang-Multi-Use- PRE scheme. This attack is also effective for other multi-use scheme.
