On 07.01.2010 12:50, Gregory Biasky wrote: > Hello. How you can encrypt a message using as a container HTML file, > that is, the message must be recorded in the gaps that HTML ignores. HTML has no "gaps", in the sense that content is ignored. The only way to transfer a cyphertext in HTML would be the <meta /> tag, which is ignored if a *browser*, or rather HTML rendering engine, cannot make sense of it (it's still available if you look in the HTML source). Content in the <body /> is displayed as best as possible by the rendering engine. This is, however, not cryptography, but a very poor man's steganography, in the first place. This is probably better placed on the security-basics mailing list[0], rather than ruby-talk, too. [0] http://www.securityfocus.com/archive/105/description -- Phillip Gawlowski