Abstract
In order to protect image information, existing encryption methods pay more attention to transforming images into noise-like images with random pixels. It is acknowledged that attackers can easily notice these encrypted images for there is a striking difference between them and unencrypted ones visible to the naked eye. As a result, these noise-like images may suffer a lot of attacks which could increase the probability of information leakage. For this problem, a method based on discrete wavelet transform and previous encryption methods has been proposed which can make the encrypted images finally look like other pictures. However, the results do not have a high quality, for some obvious noise can be found in the details of the final images. In this paper, a new method called HID is introduced in which the information is hidden in a dark area. Both experimental results and security analysis prove that our method can not only transform images full of noise into meaningful images but also produce images with higher quality.
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