An analysis of proxy signatures: Is a secure channel necessary?

Jung Yeun Lee, Jung Hee Cheon, Seung-Joo Kim

Research output: Contribution to journalArticle

86 Citations (Scopus)


A proxy signature enables the original signer to delegate her signing capability to a proxy entity, who signs a message on behalf of the original signer. In this paper, we discuss the necessity of a secure channel in proxy signatures. Though establishing a secure channel has much influence on the efficiency of the scheme, to the best of our knowledge, this topic has not been discussed before. All known proxy signatures used a secure channel to deliver a signed warrant except one which used a 3-pass weak blind signature. However, the KPW scheme [2] appeared to be secure without the secure channel. We think that our result can contribute to designing more efficient proxy signature scheme.

Original languageEnglish
Pages (from-to)68-79
Number of pages12
JournalLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Publication statusPublished - 2003 Dec 1
Externally publishedYes


ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Computer Science(all)
  • Theoretical Computer Science

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