Biometrics play an important role for user authentication in distributed environment. But security is main issue so bio-cryptography is an art of science which provide security and privacy by using biometric templates. Bio-Cryptography is a progressive technology that combines biometrics with cryptography. It is a method using biometric features to encrypt and decrypt the original data. Biometric key is generated from ear biometric template. This key used for encryption and decryption the data which provides more security needs as well as authentication.