The program, called Viral Peace, seeks to occupy the virtual space that extremists fill, one thread or Twitter exchange at a time. Shahed Amanullah, a senior technology adviser to the State Department and Viral Peace’s creator, tells Danger Room he wants to use “logic, humor, satire, [and] religious arguments, not just to confront [extremists], but to undermine and demoralize them.” Think of it as strategic trolling, in pursuit of geopolitical pwnage.

Mr Driessen told The Telegraph that the equipment and software needed to intercept and decrypt satellite phone calls from hundreds of thousands of users would cost as little as $2,000. His demonstration system takes up to half an hour to decipher a call, but a more powerful computer would allow eavesdropping in real time, he said.