Telecommunications Management Network Protocol
The Telecommunications Management Network is a protocol model defined by ITU-T for managing open systems in a communications network. It is part of the ITU-T Recommendation series M.3000 and is based on the OSI management specifications in ITU-T Recommendation series X.700. TMN provides a framework for achieving interconnectivity and communication across heterogeneous operations system and telecommunication networks. To achieve this, TMN defines a set of interface points for elements which perform the actual communications processing (such as a call processing switch) to be accessed by elements, such as management workstations, to monitor and control them. The standard interface allows elements from different manufacturers to be incorporated into a network under a single management control.
The protocol specification in "Alice-Bob" notation is as follows.
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The attack:
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In the first step, A starts a normal session with B. In the second step, I intercepts the message sent by S and then, in step 3, he impersonates B and sends his own symmetric key to the server. Finally, the intruder intercepts B and KI ⊕ KA and as he knows KI, he can find KA by computing (KI ⊕ KA) ⊕ KI . Finally, I can transmit B, KI ⊕ KA to A.
To download the complete protocol specification in Maude-NPA syntax and the outputs, click HERE