Abstract
In this paper, we propose a new image encryption and decryption system using a phase-modulated random key and the principle of interference. This optical system makes an encrypted image by the multiplication of a random phase key and a phase-modulated image. The random key and an image consist of only binary values. Thereafter a phase value of every pixel of the encrypted image is 0 or pi. The reconstructed pattern of the original image is simply performed by interfering between reference wave and a direct pixel to pixel mapping image of the encrypted image with the same random phase key. In optical experiment, both computer simulation and optical experiment show a good performance of the proposed optical method as encryption scheme.
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