On the security of two multi-use CCA-secure proxy re-encryption schemes

Authors:
Jindan Zhang;Xu An Wang;Yi Ding;Xiaoyuan Yang
Affiliations:
Department of Electronic Information, Xianyang Vocational Technical College, Xianyang, Shaanxi Province, 712000, China;Key Laboratory of Information and Network Security, Engineering University of Chinese Armed Police Force, Xi'an, Shaanxi Province, 710086, China;Key Laboratory of Information and Network Security, Engineering University of Chinese Armed Police Force, Xi'an, Shaanxi Province, 710086, China;Key Laboratory of Information and Network Security, Engineering University of Chinese Armed Police Force, Xi'an, Shaanxi Province, 710086,China
Venue:
International Journal of Intelligent Information and Database Systems
Year:
2013

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Abstract

In proxy re-encryption PRE, a semi-trusted proxy can convert a ciphertext originally intended for Alice into one which can be decrypted by Bob, while the proxy cannot know the corresponding plaintext. PRE can be classified as single-use PRE and multi-use PRE according to the times the ciphertext can be transformed. In multi-use PRE schemes, the ciphertext can be transformed from A to B and to C and so on. In CCS'09 post session, Wang et al. proposed a multi-use unidirectional CCA-secure proxy re-encryption scheme. Unfortunately, we show their proposal is not CCA-secure in the corresponding security models by giving concrete attacks. In 2010, Ren et al. proposed a hierarchical identity-based proxy re-encryption scheme without random oracles, and claimed their scheme was also multi-use and CCA-secure, we also show their scheme is not secure.