Improved delegation-based authentication protocol for secure roaming service with unlinkability

Taek Young Youn, Jongin Lim

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Recently, Lee et al. proposed a delegation-based authentication protocol which provides secure and private roaming service for portable communication systems in global mobility networks. In this paper, we show that 1) Lee et al.'s protocol cannot protect users' privacy even though the protocol provides the user identity privacy; and 2) the unlinkability is required for delegation-based authentication protocols to provide user privacy. Moreover, we propose an improved protocol with the unlinkability by modifying Lee et al.'s protocol.

Original languageEnglish
Article number5547598
Pages (from-to)791-793
Number of pages3
JournalIEEE Communications Letters
Issue number9
Publication statusPublished - 2010 Sept


  • Security
  • authentication
  • portable communication systems
  • unlinkability

ASJC Scopus subject areas

  • Modelling and Simulation
  • Computer Science Applications
  • Electrical and Electronic Engineering


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