What’s Up With Group Messaging? – Computerphile

Why encrypted group messaging isn’t as secure as point to point. Dr Mike Pound explains this ongoing problem.

Instant Messaging & the Signal Protocol:
Double Ratchet Messaging Encryption:

Relevant paper:

This video was filmed and edited by Sean Riley.

Computer Science at the University of Nottingham:

Computerphile is a sister project to Brady Haran’s Numberphile. More at

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