A New Certificateless Proxy Re-encryption Scheme

In a proxy re-encryption (PRE) scheme, a semi-trusted proxy is given special information that allows it to transform cipher texts encrypted under Alice´s public key into the different cipher texts that can be decrypted by Bob´s secret key. In 2006, Green and Ateniese proposed identity-based proxy re-encryption schemes, in which cipher texts are transformed from one identity to another. Based on this, we propose a new construction for certificate less proxy re-encryption scheme and the corresponding security model in this paper. The scheme is proved secure against chosen-plaintext attack in the random oracle model assuming that an underlying problem related to the Decisional Bilinear Diffie-Hellman problem is computationally hard.