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Why do criminals use their own encrypted messaging platforms, instead of using any of the recommended apps?
(www.europol.europa.eu)
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All they really need is a program that turns cleartext into ciphertext and back, an open communication channel to transmit ciphertext, a secure way to exchange keys, and good operational security. There are plenty of cybersecurity experts with good skills and flexible morals, except NK and Russia probably pay better than the local meth lord.