Abstract
Due to the fast growth of information technology, the transmission of sensitive information such as military images, commercial reports etc. over insecure communication channels causes a challenging security issue. The image sharing is a useful method to protect our secret images. Based on (k,n) threshold scheme, this method distributes the secret image into n shadow images which are preserved by n participants instead of only a single carrier. If we collect at least k shadow images, we can reveal the secret image. Fewer than k shadow images cannot reveal the secret image. In this thesis, we implement an image sharing and revealing system by the mechanism of Chinese remainder theorem. We encrypt the pixel values using the simple exclusive-or (XOR) cipher, so anyone who wants to reveal the secret image must own the key in encryption. In our proposed method, we can only reveal a distortion image with the least significant bit loss. However, naked eyes cannot distinguish the difference between the secret image and distortion image with only the difference of the least significant bit.