Controllable Identifier Measurements for Private Authentication with Secret Keys

Abstract

The problem of secret-key based authentication under a privacy constraint on the source sequence is considered. The identifier measurements during authentication are assumed to be controllable via a cost-constrained "action" sequence. Single-letter characterizations of the optimal trade-off among the secret-key rate, storage rate, privacy-leakage rate, and action cost are given for the four problems where noisy or noiseless measurements of the source are enrolled to generate or embed secret keys. The results are relevant for several user-authentication scenarios including physical and biometric authentications with multiple measurements. Our results include, as special cases, new results for secret-key generation and embedding with action-dependent side information without any privacy constraint on the enrolled source sequence.

arXiv comment15 pages

References in corpus (2)

• Fuzzy Extractors: How to Generate Strong Keys from Biometrics and Other Noisy Data
• Secure Biometrics: Concepts, Authentication Architectures and Challenges

Cited by in corpus (5)

• Private Authentication with Physical Identifiers Through Broadcast Channel Measurements
• Function Computation Under Privacy, Secrecy, Distortion, and Communication Constraints
• Biometric Identification Systems With Noisy Enrollment for Gaussian Source
• Secret-Key Generation from Private Identifiers under Channel Uncertainty
• Outer Bounds on the CEO Problem with Privacy Constraints