| Summary: | 碩士 === 國立雲林科技大學 === 電機工程系 === 105 === In the thesis, multiple-image encryption using wavelength, position and angle multiplexing with the various parameters in the Fresnel transform (FrT) wavelength and position is investigated. Using the optical architecture as Modified Gerchberg-Saxton algorithm (MGSA). The proposed method can improve the security of the cryptosystem, and compare to the traditional multi-image encryption only wavelength and location, the encryption parameters will increase the rotation angle, and the rotation is divided into two types around the x-axis or y-axis. When the user decrypts the image, it is necessary to know the rotation of the axial information in addition to the information of the wavelength and position parameters. The single phase multiplexing is simulated by the actual different spatial light modulators ( SLM ). However, the impact of decryption image quality includes many factors. In the angle multiplexing, mainly in the angular error sensitivity to analyze, we observed that the tilt angle of 0 °, the angle error sensitivity is poor, and the tilt angle of more than 10 °, angular error sensitivity is better, that encryption system security is high. The simulation results show that the proposed method can increase the rotation angle of the parameters, can effectively amplify the security of the encryption system and achieve the multi-parameter multiplexing encryption technology.
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