Biometrie key generator with applications in on-device encryption

Secret key plays a pivotal role in almost every cryptographic protocols. The cryptographic key should be easy for a user to reproduce and at the same time, very hard for an adversary to predict. Inherent nature, permanence and difficulty to impersonate enables biometric as a strong candidate to derive cryptographic keys. In this paper, we propose a novel biometric key generator (BKG) based on Shamir's secret sharing scheme. We have reviewed the security requirements for a Biometric Key Generator formally and have mathematically proved the security of our scheme. We have used our new BKG scheme to generate cryptographic key in a forward secure On-Device Encryption scheme, which can withstand cold-boot attack.