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Re:Hundreds arrested as crime chat network cracked by Faaak on Thursday July 02, 2020 @08:17AM (#23712311)
I have to agree that point 2 is very clever.

"It was not me, your Honour, as anyone can send a message by my (old) name)

Re:Hundreds arrested as crime chat network cracked by Thorrez on Thursday July 02, 2020 @08:29AM (#23712403)
It (deniable authentication) has been provided previously by OTR.

https://en.wikipedia.org/wiki/Deniable_authentication

TLS provides a weaker version (instead of everyone in the world being able to forge a message, just your peer is able to forge the message).