Proxy-protected signature secure against the undelegated proxy signature attack

Yu Chuan Liu, Hsiang An Wen, Chun Li Lin, Tzonelih Hwang

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


The proxy signature scheme enables an original signer to delegate his/her signing capability to a designated proxy signer, thereby the proxy signer can sign messages on behalf of the original signer. Recently, Zhou et al. proposed two proxy-protected signature schemes. One is based on the RSA problem and the other is based on the integer factorization problem. In this paper, however, we point out that Zhou et al.'s schemes are insecure against undelegated proxy signature attack because any user without the delegation of the original signer can generate a valid proxy signature. To solve this problem, an improved scheme is proposed and its security is analyzed.

Original languageEnglish
Pages (from-to)177-185
Number of pages9
JournalComputers and Electrical Engineering
Issue number3
Publication statusPublished - 2007 May

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Computer Science(all)
  • Electrical and Electronic Engineering


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