added MITM FAQ

pages/faq.html

@@ -152,6 +152,14 @@ necessity for dealing with powerful adversaries, since
 otherwise their traffic sticks out like a sore thumb.
 </pre>
 
+<h3>How do I know that I'm talking with who I'm trying to talk with?</h3>
+
+<p>I2P is "cryptographically addressed" - meaning when you try to talk to
+someone, you are trying to talk to whomever has their cryptographic 
+private key.  In addition, everything is end to end encrypted.  No one - 
+not even your local router - knows the contents of what you send to 
+them (unless 2048bit ElGamal is broken). </p>
+
 <hr />
 <h3>I have a question!</h3>
 <p>