Side-Channel Attacks on Fingerprint Matching Algorithms

Biometric authentication schemes are frequently used to establish the identity of a user. Often, a trusted hardware device is used to decide if a provided biometric feature is sufficiently close to the features stored by the legitimate user during enrollment. In this paper, we address the question whether the stored features can be extracted with side-channel attacks. We consider several models for types of leakage that are relevant specifically for fingerprint verification, and show results for attacks against the Bozorth3 and a custom matching algorithm. This work shows an interesting path for future research on the susceptibility of biometric algorithms towards side-channel attacks.