From 6cf81b3e8e9b259a3a1a2494fcd19527308c3637 Mon Sep 17 00:00:00 2001
From: Cas Cremers <cas.cremers@gmail.com>
Date: Tue, 18 Sep 2007 15:25:32 +0200
Subject: [PATCH] Added protocol that exploits the main problem of the
 Athena-based algorithm.

---
 protocols/misc/athena-breaker.spdl | 44 ++++++++++++++++++++++++++++++
 1 file changed, 44 insertions(+)
 create mode 100644 protocols/misc/athena-breaker.spdl

diff --git a/protocols/misc/athena-breaker.spdl b/protocols/misc/athena-breaker.spdl
new file mode 100644
index 0000000..7d31f73
--- /dev/null
+++ b/protocols/misc/athena-breaker.spdl
@@ -0,0 +1,44 @@
+/* 
+ * Athena breaker protocol
+ */
+
+// PKI infrastructure
+
+const pk: Function;
+secret sk: Function;
+inversekeys (pk,sk);
+
+// The protocol description
+
+protocol abreaker(I,R)
+{
+	role I
+	{
+		const ni: Nonce;
+
+		send_!1(I,R, {{I,ni}pk(R)}pk(R) );
+
+		claim_i1(I,Secret,ni);
+	}	
+	
+	role R
+	{
+		var T:Ticket;
+
+		read_!1(I,R, {T}pk(R) );
+		send_!2(R,I, T );
+
+	}
+}
+
+// The agents in the system
+
+const Alice,Bob: Agent;
+
+// An untrusted agent, with leaked information
+
+const Eve: Agent;
+untrusted Eve;
+const ne: Nonce;
+compromised sk(Eve);
+