How Belgian police infiltrated messaging service Sky ECC in February and March, gathering 1 billion messages that yielded arrests and drug seizures (James Marson/Wall Street Journal)

James Marson / Wall Street Journal:
How Belgian police infiltrated messaging service Sky ECC in February and March, gathering 1 billion messages that yielded arrests and drug seizures  —  Criminals thought encrypted Sky ECC cellphones were impregnable, but cops tapped a billion messages, yielding arrests and drug seizures