New (t,n) threshold directed signature scheme with provable security

  • Authors:
  • Rongxing Lu;Xiaodong Lin;Zhenfu Cao;Jun Shao;Xiaohui Liang

  • Affiliations:
  • Department of Computer Sciences and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China;Department of Electrical and Computer Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1;Department of Computer Sciences and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China;Department of Computer Sciences and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China;Department of Computer Sciences and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai, China

  • Venue:
  • Information Sciences: an International Journal
  • Year:
  • 2008

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Abstract

Directed signature scheme allows only a designated verifier to check the validity of the signature issued to him; and at the time of trouble or if necessary, any third party can verify the signature with the help of the signer or the designated verifier as well. Due to its merits, directed signature scheme is widely used in situations where the receiver's privacy should be protected. Threshold directed signature is an extension of the standard directed signature, in which several signers may be required to cooperatively sign messages for sharing the responsibility and authority. To the best of our knowledge, threshold directed signature has not been well studied till now. Therefore, in this paper, we would like to formalize the threshold directed signature and its security model, then present a new (t,n) threshold directed signature scheme from bilinear pairings and use the techniques from provable security to analyze its security.