[ccouzens]

> how can a user (without deep technical knowledge and skills) prove the claim of end to end encryption?

Checking to see if investigations include evidence from messages on these platforms excepting:

Messages sent by the user to someone who distributes them further

Or investigators getting control of the phone.

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WhatsApp stands up to that test.

[salawat]

Except, parallel construction is a thing; jealously guarded by law enforcement as well.