HTW Berlin Fachbereich 4 Internationaler Studiengang Internationale Medieninformatik (Bachelor) Aktuelle Themen: Cryptography Winter Term 2015/16

Lab 12: Diffie-Hellman Key Exchange

1. Use the discrete logarithm and the Diffie-Hellman Key Exchange protocol to implement a simple simulation. Create a class Alice and a class Bob (could there be a super class here, perhaps?) that choose a random number, compute the one-way function, and set up a connection (remember this? Listening on a socket!) with some other instance of the super class. Over this connection the instance exchanges a key with a partner and then calculates the common key.
2. Can you now create a class Eve that can conduct a man-in-the-middle attack on Alice and Bob? What did you have to do?

The report is due the evening before your next lecture at 23.00!