Identity-commit table signatures and their extension to group-oriented ring signatures

Cheng Kang Chu*, Wen-Guey Tzeng

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

3 Scopus citations

Abstract

The identity of "Deep Throat", a pseudonym of the information source in the Watergate scandal, remained mysterious for more than three decades. In 2005, an ex-FBI official claimed that he was the anonymous source. Nevertheless, some are still inconvinced. In this paper, we introduce a new notion of identity-committable signatures (ICS) to ensure the anonymity of "Deep Throat" inside a group. A member of an organization can sign a message on behalf of himself (regular signature) or the organization (identity-committed signature). In the latter case, the signer's identity is hidden from anyone, and can be opened by himself only. We describe the requirements of ICS and give the formal definition of it. Then we extend the notion of ICS to group-oriented ring signatures (GRS) which further allow the signer to hide his identity behind multiple groups. We believe a GRS scheme is more efficient and practical than a ring signature scheme for leaking secrets. Finally, we provide concrete constructions of ICS and GRS with information-theoretic anonymity, that is, the identity of the signer is fully-protected.

Original languageEnglish
Title of host publicationInformation Security and Privacy - 12th Australasian Conference, ACISP 2007, Proceedings
Pages323-337
Number of pages15
DOIs
StatePublished - 1 Dec 2007
Event12th Australasian Conference on Information Security and Privacy, ACISP2007 - Townsville, Australia
Duration: 2 Jul 20074 Jul 2007

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume4586 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

Conference12th Australasian Conference on Information Security and Privacy, ACISP2007
CountryAustralia
CityTownsville
Period2/07/074/07/07

Keywords

  • Anonymous signatures
  • Group signatures
  • Ring signatures

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