Today we face popularity of QR-codes. Most tech-savvy people already actively use them to transfer encoded digital information into their devices, to follow links and to  input data into their devices with no manual typing.

Some inventive “hackers” already started using this technique by sticking false QR-codes over real ones. So in case you use code-recognition client, which is automatically following links, and your Android phone does not ask you before installing apps other than those from Android market, you are in trouble. Such QR-codes might drive you to the download of a false operating system update, being a virus.

So beware of too much automation in your QR-reading software.