Private Authentication with Physical Identifiers Through Broadcast Channel Measurements

This work addresses secure authentication using physical identifiers, which is important for privacy and security in biometric systems, but it appears incremental as it builds on an existing model.

The paper extended a key agreement model for biometric or physical identifiers to include measurements through a broadcast channel, proposing an inner bound for strong secrecy, maximum key rate, and minimum privacy-leakage and database-storage rates, which was shown to be tight for physically-degraded and less-noisy broadcast channels.