CSCI361 Assignment 2

There are 2 tasks in this assignment. Both are required you to program in C/C++ or Java. You should be able to do so easily.

1. The Stream Cipher


The cipher has a key generator and a simple exclusive OR unit. The key generator is composed of two 256 bytes registers and pseudo-random number generator (PRNG) along with a key.

You should consult with the lecturer/tutor before you start the programming.


2. La Cipher-Feedback Mode (CFM)

CFM is based on the TSC cipher. The task is to link a several CFM ciphers to obtain a new cipher.



And just write a critical analysis whether this cipher system is secure.