This research suggests a unique picture encoding technique based on OFT and block-based transformation in order to communicate image data over an open network. First, a transformation technique was used to create a transformed picture, and then an optical Fourier transform (OFT) algorithm was used to encode the newly-created encrypted version of the converted image. The suggested method’s security relies on the alteration algorithm, sensitivity to the randomness of the phase mask, and the order of OFT. The method has been shown to be beneficial in theoretical and experimental studies. As a result of the implementation, the maximum and minimum UACI (unified average changed intensity) and pixel rate (NPCR). A foundation for future research and a framework for new researchers have been laid down in this study.
Optical encryption techniques in over the last 10 years have become more important in the area of optical information processing. Several applications, including online payments, medical or biometric image storage or transmission, private military applications, police identification techniques, online banking platforms, governmental services, identity (ID) cards, etc., are only a few examples. Require special and reliable security in the transmission and storage of images. Since digital picture information may be readily accessed by hackers via transmission over the Internet or other communication channels, the issue of photos with unlawful usage is becoming more and more severe. A more effective and secure means of communicating images may be offered via optical encryption. The encryption mechanism and keys are needed at the receiver side in order to decrypt the original optical data. Picture security becomes a highly important subject in communication science as a result of network growth and rising need for image transmission. There are several security issues with picture data, including forgery detection and illegal access. The most straightforward method of picture protection is to encrypt it as text. The traditional text encryption algorithms are inappropriate for picture encryption because of the high correlation present in image data. Over the last two decades, a number of optical approaches have been proposed for photo encryption, with the specific advantage of processing two-dimensional (2D) image data in parallel conduction mode. Therefore, we are doing an extensive investigation on optical image encryption in this work.
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