commercial use of steganography

Steganography involves altering an image in a way that cannot be perceived by the human eye, but which can be detected electronically. Fujitsu's technique can apparently hide a 12-digit number in a 1cm square. This would allow data such as phone numbers or a URL to be planted into a poster, a magazine advert or business card. To extract the information, a user would just have to point their camera phone or PDA at the image -- as long as the device was configured to find the hidden message. Fujitsu says that consumers could even use its steganographic procedure to add embedded information to personal photos, and print them out at home. http://news.zdnet.co.uk/hardware/emergingtech/0,39020357,...

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