Abstract
A lensless optical security system based on computer generated phase only masks is proposed in the present paper. These masks are located at determined positions along the direction of propagation so as to decrypt the target image. These positions coordinates are used as encoding parameters as well as the wavelength in the encryption process. Compared with previous studies, the proposed system has three significant advantages: first, it is lensless and therefore can minimize the hardware requirement and is much easier to implement. Second, the proposed system uses the wavelength and the position parameters besides the phase codes as additional keys and consequently achieves much higher security. Finally, the encrypted data can be directly transmitted via communication lines and then decrypted with the correct wavelength and the position parameters at the receiver. Applications and implementation considerations of the proposed system are also discussed.
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