Side-Channel Attack on Biometric Cryptosystem Based on Keystroke Dynamics

The security of biometric template is generally based on the security of algorithms, such as key binding algorithm or hash function. However, we focus on a different aspect of the problem, and note that even if the biometric template is secure in algorithmic design, it may still be vulnerable to side-channel attack due to the physical leakage. To assess the possible side-channel attack on biometric template, a secure biometric key system (BKS) is designed firstly, which combines keystroke dynamics with secret sharing scheme. Then, by measuring the power consumption leaked from the proposed BKS, we extract the correct biometric template through differential power attack (DPA).