Identity-Based Proxy Re-encryption

In a proxy re-encryption scheme a semi-trusted proxy converts a ciphertext for Alice into a ciphertext for Bob without seeing the underlying plaintext. A number of solutions have been proposed in the public-key setting. In this paper, we address the problem of Identity-Based proxy re-encryption, where ciphertexts are transformed from one identity to another. Our schemes are compatible with current IBE deployments and do not require any extra work from the IBE trusted-party key generator. In addition, they are non-interactive and one of them permits multiple re-encryptions. Their security is based on a standard assumption (DBDH) in the random oracle model.

• Type: Conference
• Year: 2007
• Where: ACNS
• Authors: Matthew Green, Giuseppe Ateniese
• Keywords: ACNS 2007, Cryptography, Identity-Based Proxy Re-encryption, Proxy Re-encryption, Proxy Re-encryption Scheme