We have shown that applying double random phase encoding to biometrics enables us to use biometric information as cipher keys for binary data encryption. In this method, we append tags to the plain image in order to detect the shifted position of the restored bit pattern and to correct the rotation angle of the fingerprint image. The tags, however, may serve as a clue for intruders to exploit the system because cryptanalysis may be achieved by using the information which represents the level of restoration of the tags. In this paper, we propose a method to eliminate the tags from the plain image for the purpose of decrypting an encrypted image appropriately without detecting the shifted position and correcting the rotation angle of the fingerprint. Computer experiments confirmed that the proposed method provides sufficient false rejection rate as well as the conventional method.

© 2010 Optical Society of America

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