On the security of two multi-use CCA-secure proxy re-encryption schemes. (1st January 2013)

• Record Type: Journal Article
• Authors: Zhang, Jindan; Wang, Xu An; Ding, Yi; Yang, Xiaoyuan
• Is Part Of: International journal of intelligent information and database systems. Volume 7:Number 5(2013)
• Page Start: 422
• Page End: 440
• Publication Date: 2013-01-01
• Subjects: proxy re-encryption -- PRE -- multi-use -- CCA security -- attack; Database management -- Computer programs -- Periodicals; Information retrieval -- Computer programs -- Periodicals; Information storage and retrieval systems -- Computer programs -- Periodicals; Artificial intelligence -- Periodicals; Expert systems (Computer science) -- Periodicals; Intelligent agents (Computer software) -- Periodicals; 006.33
• Languages: English
• ISSNs: 1751-5858

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.