Unidirectional Chosen-Ciphertext Secure Proxy Re-Encryption

Abstract. In 1998, Blaze, Bleumer, and Strauss proposed a cryptographic primitive called proxy re-encryption, in which a proxy transforms – without seeing the corresponding plaintext – a ciphertext computed under Alice’s public key into one that can be opened using Bob’s secret key. Recently, an appropriate definition of chosen-ciphertext security and a construction fitting this model were put forth by Canetti and Hohenberger. Their system is bidirectional: the information released to divert ciphertexts from Alice to Bob can also be used to translate ciphertexts in the opposite direction. In this paper, we present the first construction of unidirectional proxy re-encryption scheme with chosenciphertext security in the standard model (i.e. without relying on the random oracle idealization), which solves a problem left open at CCS’07. Our construction is efficient and requires a reasonable complexity assumption in bilinear map groups. Like the Canetti-Hohenberger scheme, it ...

• Type: Journal
• Year: 2011
• Where: TIT
• Authors: Benoît Libert, Damien Vergnaud
• Keywords: Proxy Re-encryption, Security, Standard Model, TIT 2011