imagesign is a utility to digitally sign images and store the signature within them in a comment block. This allows the images to be viewed as normal but their integrity can easily be verified with no extra information.
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.