The battle against terrorism seems to have moved to cyberspace. There is a strong possibility that Osama bin Laden exploits hi-tech graphic tools - and the Internet - to send coded messages to his cells, that are virtually `uncrackable'. Suspected terrorists were captured recently by the French police before they could execute a plan to send a suicide bomber into the American embassy in Paris. Their leader revealed that they received all their orders through pictures posted on the Internet. Web analysts believe the technology being used by the Osama groups is to conceal messages in photographs or music files using a method called steganography: Greek for `covered writing'. The technique can be traced back to ancient Greece where military messages were carved on wooden tablets, then coated with wax, to look like blanks. The receiver scrapped off the wax to read the message.