netsim/levels/04 Attacks/attacks01.html

<p>In this level, you can see an example of Bob sending Alice an <strong>encryption key</strong> in order to protect 
their messages.  However, their simple protocol is vulnerable to a <strong>Mallory-in-the-middle</strong> attack.

<p>Mallory has control over a router between Alice and Bob. She can see all messages that pass through this router and she can spoof messages from either Alice or Bob.</p>

<p>To beat this level, you need to trick Alice into encrypting her messages using a key Mallory knows: <strong>31337</strong>.  
You must also trick Bob into thinking he is having a conversation with Alice as normal!  See if you can figure out how 
to trick them both without them discovering your presence between them.

<p><em><strong>Hint:</strong> there is an example of how the encryption protocol works at the top of the field.  Use the 
<span class="button">pause</span> button to see what the values of the packet headers are in the protocol.</em>

<h3>Level Objectives</h3>

<ul>
	<li>trick Alice into encrypting her message with Mallory's key: 31337</li>
	<li>make sure Bob can still read the message, by encrypting it with his key</li>
</ul>