Privacy-security tradeoffs in biometric security systems

Lifeng Lai, Siu Wai Ho, H. Vincent Poor

Research output: Chapter in Book/Report/Conference proceedingConference contribution

38 Scopus citations


Biometric security systems are studied from an information theoretic perspective. A fundamental tradeoff between privacy, measured by the normalized equivocation rate of the biometric measurements, and security, measured by the rate of the key generated from the biometric measurements, is identified. The scenario in which a potential attacker does not have side information is considered first. The privacy-security region, which characterizes the above-noted tradeoff, is derived for this case. The close relationship between common information among random variables and the biometric security system is also revealed. The scenario in which the attacker has side information is then considered. Inner and outer bounds on the privacy-security region are derived in this case.

Original languageEnglish (US)
Title of host publication46th Annual Allerton Conference on Communication, Control, and Computing
Number of pages6
StatePublished - Dec 1 2008
Event46th Annual Allerton Conference on Communication, Control, and Computing - Monticello, IL, United States
Duration: Sep 24 2008Sep 26 2008


Other46th Annual Allerton Conference on Communication, Control, and Computing
Country/TerritoryUnited States
CityMonticello, IL

All Science Journal Classification (ASJC) codes

  • Computer Networks and Communications
  • Software
  • Control and Systems Engineering
  • Communication


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