Encrypter/Decrypter Project

This project is a simple encryption and decryption tool designed to process text files. It utilizes a permutation-based approach to provide a reversible transformation of the input text.

Features

• Encryption: The program shuffles the words in the input file using the Fisher-Yates shuffle algorithm, creating an encrypted version.
• Decryption: The decryption process reverses the permutation, restoring the original text from the encrypted file.

Usage

Compiling the solution

To compile the program, use the following command:

gcc encriptor.c -o encriptor

Encrypting a File

To encrypt a file, use the following command:

./encriptor input.txt

The encrypted words will be written to output.txt. The permutations of the words will be written to permutations.txt.

Decrypting a File

To decrypt a file, use the following command:

./encriptor input.txt permutations.txt

The initial words will be written to output.txt.

Input and Permutation Files

The decryption process involves two key files:

• input.txt: This file should contain the words to be decrypted.

• permutations.txt: This file stores the permutations generated during the encryption. Each line corresponds to a word in the input.txt file, and the numbers represent the indices after permutation.

Ensure that the order of lines in permutations.txt matches the order of words in input.txt.