As the growth of technology every information is passed widely through the internet. To ensure the secure data transmission, cryptography is the most effective solution. Cryptographic key plays an important entity to overcome channel attacks. High security is difficult in randomly generated cryptographic keys. Here random key needs to be stored in a protected place or it must transported through a shared communication line. As an alternative to this, the generation of finger print based key using the biometric information of sender/receiver is introduced. Thus avoiding key storing and at the same time without compromising the strength in security. Biometric based cryptographic key generation has some difficulties to maintain privacy of biometrics and key generation at receiver in present error data. Biometric key is generated from matching process that enrolls highly secured cryptosystem. Implementation of this proposed work has been analyzed using reversible watermarking scheme.