Multi-biometrics based cryptographic key regeneration scheme

Biometrics lack revocability and privacy while cryptography cannot detect the user´s identity. By obtaining cryptographic keys using biometrics, one can achieve the properties such as revocability, assurance about user´s identity, and privacy. In this paper, we propose a multi-biometric based cryptographic key regeneration scheme. Since left and right irises of a person are uncorrelated, we treat them as two independent biometrics and combine in our system. We propose a novel idea for feature level fusion through weighted error correction to obtain a multi-biometric feature vector which is used to get a secure template. A shuffling key which is protected by a password is used to shuffle the error correcting codes data. The password helps improve revocability, privacy, and security of the system. We succeed to generate 147-bit long keys with as much entropy at 0% FAR and 0.18% FRR on the NIST-ICE database.