New constructions of identity-based threshold decryption |
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Authors: | Leyou Zhang Yupu Hu Xu’an Tian Yang Yang |
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Institution: | 1.Department of Mathematical Science,Xidian University,Xi’an,Shaanxi, China;2.Key Laboratory of Computer Networks and Information Security of Ministry of Education,Xidian University,Xi’an,Shaanxi, China;3.Xi’an Communications Institute,Xi’an,Shaanxi, China |
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Abstract: | In this paper, based on the verifiable pair and identity-based threshold cryptography, a novel identity-based (ID-based) threshold
decryption scheme (IDTDS) is proposed, which is provably secure against adaptive chosen ciphertext attack under the computational
bilinear Diffie-Hellman (CBDH) problem assumption in the random oracle. The pubic checkability of ciphertext in the IDTDS
is given by simply creating a signed ElGamal encryption instead of a noninteractive zero-knowledge proof. Furthermore, we
introduce a modified verifiable pairing to ensure all decryption shares are consistent. Our scheme is more efficient in verification
than the schemes considered previously. |
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Keywords: | |
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