The peculiar list of search options that Google suggests as you type in a query could be hijacked to let people communicate secretly. So Wojciech Mazurczyk said at the Warsaw University of Technology in Poland, who specialized in steganography – the art of hiding messages in plain sight.
Mazurczyk and his batch dream up new ways in which spies or terrorists might try to communicate undetected, allowing security agencies to develop ways of eavesdropping on them. To avoid arousing suspicion, the method used must be as commonplace as possible, and what could be more ordinary than seeing someone googling in a cyber cafe? It wouldn’t warrant a second glance, Mazurczyk told a security conference in Prague, Czech Republic, last month.
So the team turned to Google Suggest to see if it could hide messages. Google Suggest works by listing up to 10 suggestions each time a letter is added to a search term, based on the most popular searches made by other Google users that begin with the same letters. The words offered change as each new letter is added.
Some of the options that appear as your search term takes shape can often seem quite strange: “runescape”, “rotten tomatoes” and “rock and chips” for “r”, “ro” and “roc” in “rocket”, for instance. This is the key to how Mazurczyk’s team adds its own search suggestions to the list to encode secret messages.
However, Ross Anderson, a cryptography and security specialist at the University of Cambridge, thinks there is enough traffic between sender and receiver to alert authorities that something suspicious is afoot – thereby undermining the process.
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