Ciphertool

Some tools to encrypt and decrypt the Rotation (Caesar) Cipher and Substituion Cipher

Features:

• Encrypt/decrypt a message using a key
• Crack the Rotation Cipher (find the right key)

To run the program

Compile: gcc -o ciphertool main.c ciphertool.c

Run: ./ciphertool

Or, to compile and run in one command: gcc -o ciphertool main.c ciphertool.c && ./ciphertool

Files

• main.c: User-interactive CLI program.
• ciphertool.c: Functions to cipher/decipher
• ciphertool.h: The C header file for the cipher functions.
• google-10000-english.txt: The 10,000 most common English words in order of frequency, as determined by n-gram frequency analysis of the Google's Trillion Word Corpus.

Why?

This program was made for a bit of fun. It's in no way robust and has loads of limitations eg. can only use CAPITAL letters. Use and abuse as you see fit.