IACR News item: 14 November 2014
Akshayaram Srinivasan, C. Pandu Rangan
ePrint ReportIn this work, we construct the first unidirectional, single-hop CCA-secure certificateless proxy re-encryption scheme without pairing by extending the PKI based construction of Chow et al. proposed in 2010. We prove its security in the random oracle model under the Computational Diffie-Hellman (CDH) assumption. Prior to this work, the only secure certificateless proxy re-encryption scheme is due to Guo et al. proposed in 2013 using bilinear pairing. The construction proposed in this work is more efficient than that system and satisfies stronger security properties. We also show that the recently proposed construction of Yang et al. is insecure with respect to the security model considered in this work.
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