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Would a replay attack be possible in any of these scenarios? My understanding is that in only images 3 & 4 it is possible.

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  • $\begingroup$ I guess $\mathsf{N_X}$ is a nonce. That $\mathsf{E(K_{AB},…)}$ means symmetric encryption with a secret key assumed known by A and B only. That $\mathsf{E(PU_A,N_A])}$ means asymmetric encryption of $\mathsf{N_A}$ with a public key which matching private key is assumed known by A only. That lack of opening $\mathsf[$ is poetic license. That $\mathsf{E(PR_B,…)}$ means signature with a private key known by B only, even though signature is not encryption. $\endgroup$
    – fgrieu ♦
    Feb 27 at 22:26
  • $\begingroup$ Yes, that is how I understood the terms as well. I'm just a little confused on whether I am right in understanding which sequences are victim to a replay $\endgroup$
    – timberus
    Feb 27 at 22:46

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