Communications of the ACM
Hiding Files in Flickr Pics Will Fool Web Censors
Life is about to become more difficult for countries trying to censor access to foreign Websites. A system dubbed Collage will allow users in these countries to download stories from blocked sites while visiting seemingly uncontroversial sites such as Flickr.
Collage relies on a well-established technique known as digital steganography, in which an image file is changed to encode the hidden message without obviously affecting the appearance of the image. A prototype version is due to be unveiled on Friday, 13 August.
Steganography normally requires specialist software, but Collage is designed so that anti-censorship activists and readers can publish and download the hidden stories without any specialist skills. A publisher or activist can, for example, use Collage to copy news stories from a website and embed the articles into Flickr images in a process that is almost entirely automated.
From New Scientist
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