Engineers at UNSW Sydney and Monash have developed an innovative way of sending hidden information that’s hard to intercept. Using a phenomenon known as “negative luminescence,” the system works by making signals blend perfectly into the background of natural heat radiation, such as can be seen with a thermal camera.
To outside observers, it looks like no data is being sent at all. Only a receiver with the right equipment can pick up the hidden message.
Because the very act of communication is invisible, the method makes signals almost impossible to intercept or hack. That means it could one day offer a powerful new security tool for sensitive communications in fields like defense and finance.
