Cryptanalysis of a certificateless proxy signature and its extension to blind signature

@article{Gao2012CryptanalysisOA,
  title={Cryptanalysis of a certificateless proxy signature and its extension to blind signature},
  author={Bingjian Gao and Guozheng Hu and Lansheng Han},
  journal={2012 IEEE International Conference on Computer Science and Automation Engineering (CSAE)},
  year={2012},
  volume={1},
  pages={356-359}
}
Recently, Tso et al. proposed a certificateless proxy signature scheme and extended it to a certificateless proxy blind signature scheme. They claimed that their schemes have the unforgeability property. However, in this paper, we show that their schemes are forgeable under the public key replacement attack. By substituting the public keys of an original… CONTINUE READING