Netinfo Security ›› 2015, Vol. 15 ›› Issue (10): 8-13.doi: 10.3969/j.issn.1671-1122.2015.10.002

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A Strong Designated Verifier Ring Signature and Signcryption Scheme

ZHAO Yang, YUE Feng(), XIONG Hu, QIN Zhi-guang   

  1. School of Information and Software Engineering, University of Electronic Science and Technology of China, Chengdu Sichuan 610054, China
  • Received:2015-06-14 Online:2015-10-01 Published:2015-11-04

Abstract:

The designated verifier signature specifies a verifier to check the validity of the signature; any third party can not check it because the designated verifier is able to generate an indistinguishable signature from the signer’s signature. In ring signature scheme, the signer can sign the message on behalf of the ring anonymously, the verifier can check the validity of the signature, but it cannot recognize which member of the ring has signed it. In order to ensure the signer’s identity privacy and that only the designated verifier can check the authenticity of the signature, Wu propose a strong designated verifier ID-based ring signature scheme through combining the designated verifier signature and the ring signature. The scheme allows the signer to designate a verifier and generate a designated verifier ring signature. Through the analysis on Wu’s scheme, we figure out the scheme does not satisfy the attribute of non-delegatability in designated verifier signature scheme and describe the attack method in this paper. For the sake of avoiding the flaw, this paper improves Wu’s scheme and makes it provably secure. In addition, according to the improved scheme, we propose a strong designated verifier ring signcryption scheme providing authentication and confidentiality simultaneously.

Key words: ring signature, signcryption, designated verifier ring signature, non-delegatability

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