IFN642 Applied Cryptography and Network Security 1 | P a g e Introduction to Diffie-Hellman Exercise – Exploring Templates CrypTool provides templates for many of the basic combinations of primitives. If there is a primitive you are interested in, the templates section if often a good point of reference. To start this practical we are going to explore and modify several templates around Diffie-Hellman. Activity 1. Exploring Diffie-Hellman Open the Diffie-Hellman Key Exchange template. Try running the program by pressing the Play button, in the ribbon menu. a) How does the Diffie-Hellman exchange work? b) Why couldn't an adversary calculate the secret value? IFN642 Applied Cryptography and Network Security 2 | P a g e Activity 2. Explore AES Diffie-Hellman Video Chat. Open the Diffie-Hellman AES Video Chat template. Try running the program by pressing the Play button, in the ribbon menu. a) Try entering messages into text input and see what happens. b) How is the shared key calculated? c) How is the key used? Assessment Challenge – Diffie-Hellman AES File Encryption Task 1. Modify Diffie-Hellman AES Video Chat Template to exchange key and encrypted files over a network. a) Remove the existing video and text elements. b) Add file input and outputs to enable file transfer. Preparing your results At the end of this practical please submit a report, which should consist of a copy of the source (.cwm) file that you had at the end of task 1, and a 2 page pdf with a screen shot and text explaining how it is done.