A novel biometric crypto system based on cryptographic key binding with user biometrics

Cryptography plays a significant role in ensuring data security and confidentiality. The security provided by a crypto system mainly depends on the secrecy of the cryptographic key. If the secret key gets compromised, then it may lead to compromise of the protected data. Biometric cryptosystem provides a solution for securing the cryptographic key by binding the secret key with user biometric data. In this paper, we have proposed a novel biometric crypto system involving key binding mechanism. New objective functions have been introduced to create helper data by binding the secret key with biometric data of the user. In the retrieval phase, local minima of the objective functions act as anchors to get the secret key. Performance evaluation shows that the proposed method achieves more than 98% success rate even in presence of limited noise in the biometric data. Further, performance metrics viz., FAR, GAR, GWDR and IWDR have been obtained for cryptographic key sizes of 256, 512, 1024 and 2048 bits. Security analysis shows that the proposed method is robust against brute force attack and correlation attack.