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Re:(n+1)sec – a protocol for distributed multiparty chat enc... by mobiletelephone on Sunday August 13, 2017 @07:58PM (#15005702)
Because the threat model is different. Why would your friends and colleagues in a group chat want to tinker with the order of messages? Just trust a sender's timestamp, provided it's within X minutes.
Re:(n+1)sec – a protocol for distributed multiparty chat enc... by EGreg on Sunday August 13, 2017 @08:01PM (#15005719)
The idea is that you never trust input from other clients.

If I am playing my friends in video games then what guarantee do I have someone isn't cheating?