Steganos is another form of encryption, also downloadable for free. Steganos is a specific software package, but it is based on the art of encrypting data, text or graphic, into an image. An example would be if you wanted to do more than encrypt a document, you actually wanted to hide it. However, it is real, in use and has recently been acknowledged by several governments. Surveillance Section is a section that Zdnet in the United Kingdom has organized for people like yourself curious about current privacy issues.
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Definitely worth checking out.