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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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... theoretically. In practice if the NSA used a secret court order that banned them from talking about it and made them update the app to reveal plaintext for one particular person, I don't see how they could get out of that (other than by breaking the law and risking jail).
I think the chances of that are very small though.
There is legislation in Australia that allows precicely this. Then 5 eyes or Interpol or whatever for everyone else.
...that's a terrifying but also plausible prospect. Guess it's a reason not to use the published app and instead build it yourself.