From the BBC: Hiding messages in plain sight.
A technology that can "hide" information in plain sight on printed images has begun to see the first commercial applications.
Japanese firm Fujitsu is pushing a technology that can encode data into a picture that is invisible to the human eye but can be decoded by a mobile phone with a camera.
The company believes the technology will have spin off implications for the publishing industry.
"The concept is to be able to link the printed page into the digital domain," said Mike Nelson, general manager for sales operations at Fujitsu Europe.
The technique stems from a 2,500-year-old practice called steganography, which saw the Greeks sending warnings of attacks on wooden tablets and then covering them in wax and tattooing messages on shaved heads that were then covered by the regrowth of hair. [continue]