see: USG v Apple 016 1.pdf
Page 97
Researchers in London last year discovered an online jihadi handbook
with instructions
on sending encrypted instant messages that would be indecipherable to
law enforcement.
The tools it recommended—ChatSecure and Cryptocat—are popular throughout the
Middle East, making them easily available to extremists from that part
of the world.
They were also developed largely with money from the U.S. government.
