Cryptology ePrint Archive: Report 2010/444

New Construction of Identity-based Proxy Re-encryption

Song Luo and Jianbin Hu and Zhong Chen

Abstract: A proxy re-encryption (PRE) scheme involves three parties: Alice, Bob, and a proxy. PRE allows the proxy to translate a ciphertext encrypted under Alice's public key into one that can be decrypted by Bob's secret key. We present a general method to construct an identity-based proxy re-encryption scheme from an existing identity-based encryption scheme. The transformed scheme satisfies the properties of PRE, such as unidirectionality, non-interactivity and multi-use. Moreover, the proposed scheme has master key security, allows the encryptor to decide whether the ciphertext can be re-encrypted.

Category / Keywords: public-key cryptography / Proxy Re-encryption, Identity-Based Encryption

Date: received 16 Aug 2010, last revised 3 Oct 2010

Contact author: luosong at infosec pku edu cn

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Version: 20101003:161916 (All versions of this report)

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