CBC Ciphers and Cryptanalysis Attacks

An implementation of CBC mode of operation (block cipher) in Java.

This project was an assignment in security course, Ben Gurion University, Spring 2015.

What's inside?

1. CBC cipher with substitution key (long and short but actually there is no difference except the key range and the block size- just because we required to seperate them to different JARs).
2. Cipher Text Only Attack- by the obvious way of brute force, but also by genetic algorithm which improves the key until it found. this one is for relatively small keys. More info about the implementation.
3. Known Plain Text Attack- which uses the algorithm implemented in task #2 (cipher text only attack) in order to crack larger keys.

How to build?

mvn clean package and you'll get 4 executable JARs in target folder of the parent directory, contains the class files and the sources (sorry, assignment requirements...).

How to test?

There are no JAVA tests (like junit), but you can run a primitive tests script: ./test to build and run some examples.

Have Fun!