Analysis and improvement of authenticatable ring signcryption scheme |
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| Authors: | Fa-gen Li Shirase Masaaki Takagi Tsuyoshi |
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| Affiliation: | (1) School of Computer Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China;(2) State Key Laboratory of Information Security, Graduate School of Chinese Academy of Sciences, Beijing, 100049, China;(3) School of Systems Information Science, Future University-Hakodate, Hakodate 041-8655, Japan |
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| Abstract: | We show that the Zhang-Yang-Zhu-Zhang identity-based authenticatable ring signcryption scheme is not secure against chosen plaintext attacks.Furthermore, we propose an improved scheme that remedies the weakness of the Zhang-Yang-Zhu-Zhang scheme.The improved scheme has shorter ciphertext size than the Zhang-Yang-Zhu-Zhang scheme.We then prove that the improved scheme satisfies confidentiality, unforgeability, anonymity and authenticatability. |
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| Keywords: | identity-based cryptography bilinear pairings ring signcryption ring signature |
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