Here is the Power Point Presentation on Cold Fusion

Here are the notes on BGP attacks

IPSec and SSL use the Diffie Hillman key exchange algorithm. This is a method which allows two strangers to agree on an encryption key without either party actually sending the key over the network.

Here is how the Diffie Hillman algorithm works

Note that both Bob and Alice know the key K, but Eve cannot calculate it even if she is able to intercept all of the messages.

However, the Diffie Hillman algorithm is subject to the man in the middle attack, so IPSec uses a variant called Oakley, which incorporates authentication and other security measures in addition to Diffie Hillman.

Kerberos

Developed at MIT as part of Project Athena in the 1980s. Very widely used now. It uses a different approach to security and authentication than other methods that we have seen.

Assume that we have a network of clients and servers. Assume that Eve can read every message sent, and can spoof any client or any server. We want to accomplish three things.

• We want clients and servers to be able to communicate without Eve being able to read the messages.
• When a client sends a message to a server, the server has to be able to authenticate the request. If the client claims to be Alice, the server needs to be able to trust that the message is in fact from Alice.
• When a client connects to a server, the client needs to be certain that the server is the true server and not Eve pretending to be the server.

Here is how it works

and here is the explanation

RSA Presentation

Here is the program to compute RSA

And here are some notes on the RSA presentation taken by a thoughtful student