Frequential Analysis

• Frequential Analysis
  • Author
  • Instructions
    • Packages
    • How to preprocess your book
    • Compiling
    • Run the Ciphers
    • Run the deciphers (you will be asked to enter a shift and if you decline, the program will run the cryptanalysis instead)
  • Automation script

Author

• Amine-Ayoub Bigham

Instructions

Packages

First, you will need java and c++ building tools (if not already installed):

$ sudo apt update 
$ sudo apt install build-essential default-jdk default-jre 

How to preprocess your book

An already preprocessed book is available in the repo (mybook.txt). However, if you want to use your own personal book, please put it inside the folder and run:

$ javac PreprocessText.java
$ java PreprocessText <your_input_book.txt> <your_preprocessed_output.txt>

You now have a preprocessed book file that can be used to run the algorithms on.

Compiling

To compile the different files:

• run make in your terminal, you will now have two binaries : cesar and vigenere

Run the Ciphers

• ./cesar -c <mybook.txt> <ciphered.txt>
• ./vigenere -c <mybook.txt> <ciphered.txt>

Run the deciphers (you will be asked to enter a shift and if you decline, the program will run the cryptanalysis instead)

• ./cesar -d <ciphered.txt> <deciphered.txt>
• ./vigenere -d <ciphered.txt> <deciphered.txt>

Automation script

The script.sh file will run everything for you in the perfect order, using the example book already present in the repo:

• chmod +x script.sh
• ./script.sh