"The cracking of the expensive messaging app, called “Sky ECC,” was what allowed over 1,500 police officers across Belgium to be simultaneously deployed in at least 200 raids, many of which were centred around Antwerp and involved special forces."

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https://www.brusselstimes.com/news/belgium-all-news/159039/cracking-of-encrypted-text-messaging-service-sky-ecc-app-dealt-major-blow-to-organised-crime/