Efficient Certificateless Ring Signcryption Scheme
Sun Hu · 2014
Ring signcryption is an important cryptographic primitive which combines the functions of encryption and ring signature.It can provide confidentiality,authenticity and anonymity simultaneously.At present,most of existing certificateless ring signcryption schemes are proposed in the random oracle,however,they sometimes are proven to be insecure when the hash functions are instantiated.Aiming at this problem,a certificateless ring signcryption scheme was put forward without random oracles in this paper.Meanwhile,it was proven that this scheme satisfies indistinguishability against adaptive chosen ciphertext attacks and existential unforgeability against adaptive chosen message attacks under the computational Diffie-Hellman assumption and decisional Diffie-Hellman assumption,so the scheme is secure and reliable.