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  ______   _    _     ______   __   __   __   __  
 /_   _// | || | ||  /_   _//  \ \\/ //  \ \\/ // 
 `-| |,-  | || | ||  `-| |,-    \ ` //    \   //  
   | ||   | \\_/ ||    | ||      | ||     / . \\  
   |_||    \____//     |_||      |_||    /_//\_\\ 
   `-`'     `---`      `-`'      `-`'    `-`  --`

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Text this: Optical colour image encryption using spiral phase transform and chaotic pixel scrambling