Group-oriented undeniable signature schemes with a trusted center

N. Y. Lee, T. Hwang

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


At Auscrypt '92, Harn and Yang firstly proposed the concept of group-oriented undeniable signature. Two threshold undeniable signature schemes were devised in their article, where t can be either 1 or n. However, Langford in 1996 showed that the Harn-Yang (n, n) threshold undeniable signature scheme is not secure enough. In 1996, Lin et al. also proposed a new (t, n) threshold undeniable signature scheme without a trusted center. Unfortunately, the Langford attack can be applied to Lin et al.'s scheme as well. Thus, the problem of designing a general group-oriented (t, n) threshold undeniable signature scheme is remained open. The purpose of this article is to propose a (t, n) threshold undeniable signature scheme, where 1≤t≤n. Moreover, the signing policy will be extended to the generalized case, where any authorized subset can sign messages.

Original languageEnglish
Pages (from-to)730-734
Number of pages5
JournalComputer Communications
Issue number8
Publication statusPublished - 1999 May 25

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications

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