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WhatsApp and Signal messages at risk of surveillance following EncroChat ruling, court hears | Computer Weekly
(www.computerweekly.com)
This is a most excellent place for technology news and articles.
Anything on the signal protocol could have an infected cilent be delivered, or backdoor server side by providing the wrong keys.
Facebook might comply. Would guess that Signal would refuse and would be hit by some absurd fee like 100mil a day for not complying and be forced to pull their services out of the UK.