COEN 350 Spring 2006
Project Proposals

  1. DES Cracker: Build a software implementation of DES encoding for a 64b block. Then try to find a key that transforms the zero block into the block 0xabbaabba. Hint: You can spped the cracker up by avoiding the initial and final permutation.
    Your grade does not depend on actually finding the key.
  2. XOR-Code: Encryption by XORing with a one-time pad is proven to be cryptographically absolutely secure. However, if we reuse the pad, then we make the encryption vulnerable. Worse, we could XOR with a short repeating key. For this project, you basically develop a number of tools that allow you to quickly crack this encryption scheme. If you choose this project, you will be provided a lengthy XOR-encrypted text to decypher. (See Bruce Schneier: Applied Cryptography.)
    To do this project, decipher the challenge.txt file.
  3. Lamport's Hash implements one-time passwords. Implement Lamport's hash without the messaging.
  4. Create procedures that implement the calculations of the Diffie-Hellman key exchange. You need to figure out or read up on how to best do exponentiation using a large prime. You can take p to be a known large prime. The number g does not really need to be a generating element, as long as the set of powers of g is large.
  5. Implement from scratch a program that does port scans of another computer. (Port scans could be illegal or inethical if executed without permission by the owner of the scanned machine.)
2009 Thomas Schwarz, S.J., COEN, SCU SCU COEN COEN350 T. Schwarz
These documents are not intended for dissemination beyond SCU.        CAVEAT LECTOR