Question
(Diffie-Hellman) 1) extend Diffei Hellman protocol to four people (P 0... P3) so that P 0 can send messages only to P 1 ,..., P
(Diffie-Hellman)
1) extend Diffei Hellman protocol to four people (P0...P3) so that P0 can send messages only to P1,..., P3 can send messages only to P0 - and explain why it is safe against a passive adversary that can only listen to messages, but it is not safe agaisnt an active adversary that can change messages that are being transmitted between participants.
2) improve the protocol you've written so it will be safe against an active adversary that can change messages in only one communication line(for instance it can only change messages between P2 to P3). Hint for 2: to do so, now each participant can change messages to two participants whose index is bigger/small by 1. for instance: P3 can send messages to either P2 or P0 explain well what you did and show the algorithm you changed. thank you very much for helping me!
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