Cryptology ePrint Archive: Report 2010/319

On the Security of a Bidirectional Proxy Re-Encryption Scheme from PKC 2010

Jian Weng and Yunlei Zhao

Abstract: In PKC 2010, Matsuda, Nishimaki and Tanaka proposed a bidirectional proxy re-encryption (PRE) scheme without bilinear maps, and claimed that their scheme is chosen-ciphertext secure in the standard model. However, by giving a concrete attack, in this paper we indicate that their PRE scheme fails to achieve the chosen-ciphertext security. The purpose of this paper is to clarify the fact that, it is still an open problem to come up with a chosen-ciphertext secure PRE scheme without bilinear maps in the standard model.

Category / Keywords: public-key cryptography / public-key cryptography

Date: received 27 May 2010, last revised 30 May 2010

Contact author: cryptjweng at gmail com

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Version: 20100531:141147 (All versions of this report)

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