Chosen ciphertext secure identity-based broadcast encryption in the standard model |
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Authors: | Jin Sun Yu-pu Hu Le-you Zhang |
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Institution: | 1.Key Laboratory of Computer Network and Information Security,Xidian University,Xi’an,China;2.Department of Application Mathematics,Xi’an University of Technology,Xi’an,China |
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Abstract: | To give concurrent consideration both the efficiency and the security (intensity of intractable problem) in the standard model,
a chosen ciphertext secure identity-based broadcast encryption is proposed. Against the chosen ciphertext security model,
by using identity (ID) sequence and adding additional information in ciphertext, the self-adaptive chosen identity security
(the full security) and the chosen ciphertext security are gained simultaneously. The reduction of scheme’s security is the
decisional bilinear Diffie-Hellman (BDH) intractable assumption, and the proof of security shows that the proposed scheme
is indistinguishable against adaptive chosen ciphertext attacks in the standard model under the decisional BDH intractable
assumption. So the security level is improved, and it is suitable for higher security environment. |
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Keywords: | |
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