Steganalysis of synthetic low-colour images

Steganalysis is the science of detecting the presence of hidden information in media files. In this paper, we propose a simple scheme based on close colours that detects not only the presence of hidden information but also the size of the hidden information. The scheme applies to synthetic digital images with a small number of distinct colours (such as logos and flags). We compare our scheme to another published scheme and empirically show that our scheme has a higher accuracy in detecting the size of the hidden information. In practice, it is not likely that information would be hidden in images with low colour count. Yet, the proposed scheme is of interest due to the fact that it can accurately detect the size of the hidden information.