Abstract.

在本篇PAPER中圖片進行加密或浮水印隱藏皆是利用頻域來做編碼,利用隨機相位來掩飾最初的影象，使圖片無法被識破,這種方法是利用選取出的圖片加密加上浮水印技術,以增加安全性,使改變後的圖片不容易被發現,最後,我們需要2把鑰匙KEY才能夠將圖片還原,這個提出的方法是通過計算機模擬後所提出的.

In this paper image cryptography and steganography performed in frequency domain using random phase mask encoding are presented. The use of random phase mask allows to deccorrelate initial image and makes it unrecognized. This property is used for proposed image encryption and for steganography to increase the security level of the encoded image and to make it less visible. Finally, two keys are needed to decrypt the image. The efficiency of the proposed approach is demonstrated by the computer modeling.