From 98d66526bca114a52958b55fb0e2efe020a2f8ea Mon Sep 17 00:00:00 2001
From: Martin Wistauder <mwistauder@student.tugraz.at>
Date: Fri, 27 May 2022 16:36:55 +0200
Subject: [PATCH] Added protocol idea, wip.

---
 protocol.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 protocol.md

diff --git a/protocol.md b/protocol.md
new file mode 100644
index 0000000..a1fe44f
--- /dev/null
+++ b/protocol.md
@@ -0,0 +1,18 @@
+# The Authentication and Message Exchange Protocol
+
+[A]lice wants to communicate with [B]ob privately.
+
+## Protocol Steps
+
+1. Authenticate to the server and establish communication.
+   1. A tells the server to open a communication.
+      1. A calculates the challenge.
+      2. A sends the challenge to the server.
+   2. B tells the server to answer A's communication request.
+      1. B receives A's challenge.
+      2. B answers the solution to the server.
+      3. The server checks the solution and accepts the communication establishment.
+2. Generate and exchange an ephemeral key.
+3. Instantiate symmetric encryption using the ephemeral key.
+4. Authenticate each other directly.
+5. Check communication transcript (avoid malicious server).
\ No newline at end of file
-- 
GitLab