Cryptanalysis and Improvement on a Threshold Proxy Signature Scheme

  title={Cryptanalysis and Improvement on a Threshold Proxy Signature Scheme},
  author={Zuowen Tan and Zhuojun Liu},
  journal={J. Inf. Sci. Eng.},
In a (t, n) threshold proxy signature scheme, an original signer can delegate the signature authority to a proxy group of n member such that t or more than t proxy signers can cooperatively sign messages on behalf of the original signer, but t − 1 or fewer proxy signers cannot generate a valid proxy signature. In this paper, we review the security of C. L. Hsu et al.’s threshold proxy signature schemes with known signers. We show that the threshold proxy signature scheme is insecure against… CONTINUE READING