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：9
页码：337-344
DOI：10.14257/ijsia.2015.9.9.29
出版社：SERSC
摘要：In an identity-based proxy re-encryption scheme, a semi-trusted proxy can convert a ciphertext under Alice's public identity into a ciphertext for Bob. The proxy does not know the secret key of Alice or Bob, and also does not know the plaintext during the conversion. In identity-based proxy re-encryption, the collusion of the proxy and a delegatee may result in the decryption of ciphertext for delegator. In this paper, we present a new scheme which can avoid the collusion of proxy and delegatee. Our scheme improves the scheme of Chu and Tzeng while inheriting all useful properties such as unidirectionality and non-interactivity. In our scheme, we get the security by using added secret parameter and change the secret key and re-encryption key. Our sheme is secure against Chosen- Ciphertext Attack (CCA) and collusion attack in the standard model.
关键词：Identity-based proxy re-encryption; Collusion attack; CCA; Standard model
