Anonymous authentication: For privacy and security

Kazue Sako*, Shoko Yonezawa, Isamu Teranishi

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


This paper presents NEC's activities on anonymous authentication. Anonymous authentication is a means of authorizing a user without identification. The technology serves as a breakthrough to enhance the privacy of the user and yet preserve the security of the system. A well-known example of such an authentication scheme is called the 'group signature scheme,' where a user can be authorized as a group member without identifying the name of the member. We propose a new group signature schemes that solve the member revocation problem and the centralized authority problem. We further propose a new notion of k-times anonymous authentication, whereby unlike the group signature scheme; no authority can identify a user who has accessed less than k-times.

Original languageEnglish
Pages (from-to)79-83
Number of pages5
JournalNEC Journal of Advanced Technology
Issue number1
Publication statusPublished - 2005 Dec
Externally publishedYes


  • Cryptographic protocol
  • Group signature
  • Privacy
  • Zero-knowlegde proof

ASJC Scopus subject areas

  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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