I've been given the transaction below and I am asked the purpose of some of the messages, but before I can do anything I have to establish what protocol it is. I have been pointed in the direction of the spore repository but I can't match the protocol to any of the ones listed.
1. A > S: A, B, N1 2. S > A: S, sig((S, A, N1, KpubB), KprivS) 3. A > B: A, B, sig((A, T, enc(N2, KpubB)), KprivA) 4. B > S: B, A, N3 5. S > B: S, sig((S, B, N3, KpubA), KprivS) 6. B > A: B, A, enc(B, inc(N2)),KpubA)