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A certificateless threshold public key encryption scheme |
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| Authors: | Xiubin Zou Ran Zou |
| Affiliation: | 1. School of Computer Science and Technology, Huazhong University of Science and Technology, Wuhan, 430074, Hubei, China 2. College of Computer and Mathematics, Jianghan University, Wuhan, 430056, Hubei, China 3. Ira A. Fulton Schools of Engineering, Arizona State University, Arizona, 85287-9309, USA |
| Abstract: | The decryption participant’s private key share for decryption is delegated by key generation center in the threshold IBE scheme.However,a key generation center which is absolutely trustworthy does not exist.So the author presents a certificateless threshold public key encryption scheme.Collaborating with an administrator,the decryption participant generates his whole private key share for decryption in the scheme.The administrator does not know the decryption participant’s private key share for decryption.Making use of q-SDH assumption,the author constructs a certificateless threshold public key encryption scheme.The security of the scheme is eventually reduced to the solving of Decisional Bilinear Diffie-Hellman problem.Moreover,the scheme is secure under the chosen ciphertext attack in the standard model. |
| Keywords: | certificateless public key cryptosystem identity-based encryption threshold public key encryption decisional bilinear Diffie-Hellman assumption bilinear pairings |
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