“Terrorists have substantially changed their methods of communication since leaks by former U.S. intelligence operative Edward Snowden, hindering intelligence agencies’ efforts to track them, a senior British security official said on Tuesday.
‘The Snowden effect has been a very, very severe one,’ Stephen Phipson, a director at Britain’s Office for Security and Counter Terrorism (OSCT), told a London security conference.”
Source:Terrorists have changed methods since Snowden leaks: UK official | Reuters