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What would it take for a consumer grade or business grade device and messaging app to be suitable for discussing matters of national security?

The article mentions being able to use a single account across multiple devices as being a problem — what other issues are there?

>what other issues are there?

Being able to leave the building with it and show random people on the street your phone screen.

the fact that one of the group chat members was in Moscow at the time is an issue too.