The Jaish module that plotted the 10/11 Delhi blast used encrypted chat apps. Sources have told NDTV that three doctors linked to Al Falah University - Dr. Umar Un Nabi, Dr. Muzammil Ahmad Ganaie, and Dr. Shaheen Shahid - were in constant contact through an encrypted platform called Threema. Investigators believe the trio used the Threema app to plan and coordinate their terror activities. Our next report explains how Threema is different - it doesn't require a phone number or an email ID, making users extremely difficult to trace.