While there was early arm-waving and lying by major news media about supposed communication channels which may
have been used before the Paris murders, the facts are showing the
criminals used common plain-text messaging (known as "SMS" outside the
USA).
In the wake of the Paris murders, John McCain is advocating for additional spy powers for the American government. There are a couple fundamental problems with encryption with back doors: 1) criminals can't be forced to use it as they can make their own encryption and 2) back doors will be found and exploited by foreign adversaries and even criminals.
John McCain is an enemy of liberty and the Constitution which he swore an oath to uphold and protect.
