THE internet’s underlying technology can be harnessed to let people exchange secret messages, perhaps allowing free speech an outlet in oppressive regimes.
So says a team of steganographers at the Institute of Telecommunications in Warsaw, Poland. Steganography is the art of hiding a message in an openly available medium. For example, you can subtly change the pixels in an image in a way that is undetectable to the eye but carries meaning to anyone who knows the pre-arranged coding scheme.
Wojciech Mazurczyk, along with Krzysztof Szczypiorski and Milosz Smolarczyk, have already worked out how to sneak messages into internet phone…
