Experts say that the Barcodes our highly automated business world could now hardly do without, often display serious security holes. In particular, one- or two-dimensional systems of barcodes and matrix codes are open to common hacker attacks and to experiments that have had variable results. This was stated by "FX" of the Phenoelit group at the 24th Chaos Communication congress (24C3) in Berlin on Friday evening. Frequently, he said, all you had to do was simply copy "used" barcodes in a copyshop, or scan them in and print them out.
Barcode systems susceptible to serious hacker attacks
http://www.heise-security.co.uk/news/101151
