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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Foundation item: the National Natural Science Foundation of China (No. 60673075); the National High Technology Research and Development Program (863) of China (No. 2006AA01Z428); the State Key Laboratory of Information Security, and the Youth Science and Technology Foundation of UESTC
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Li, Fg., Masaaki, S. & Tsuyoshi, T. Analysis and improvement of authenticatable ring signcryption scheme. J. Shanghai Jiaotong Univ. (Sci.) 13, 679–683 (2008). https://doi.org/10.1007/s12204-008-0679-2
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DOI: https://doi.org/10.1007/s12204-008-0679-2