ZYPHER - Encryption & Decryption Tool

ZYPHER Is A C++ Program That Offers Various Encryption And Decryption Algorithms For Securing Text. It Includes A Collection of Classic Ciphers Such As The Caesar Cipher, Atbash Cipher, Rot13 Cipher, Vigenère Cipher, And Polybius Cipher (Both Standard And Custom Variants).

Features

• Caesar Cipher: A Substitution Cipher That Shifts Each Letter of The Plaintext By A Certain Number of Positions Down or Up The Alphabet.
• Atbash Cipher: A Substitution Cipher That Reverses The Alphabet (A Becomes Z, B Becomes Y, And So On).
• ROT13 Cipher: A Special Case of The Caesar Cipher, Where Each Letter Is Shifted By 13 Positions.
• Vigenère Cipher: A Polyalphabetic Substitution Cipher That Uses A Keyword To Shift Letters In The Plaintext.
• Polybius Cipher (Standard): A Cipher That Uses A 5x5 Square To Map Letters To Pairs of Digits.
• Polybius Cipher (Custom): A Variant of The Polybius Cipher Where The 5x5 Square Can Be Customized.

Getting Started

To Use This Program, Compile The C++ Source Code And Execute The Resulting Binary. The Program Will Ask For User Input And Guide You Through The Encryption or Decryption Process.

Prerequisites

You Need A C++ Compiler (e.g., GCC Or Clang) To Build And Run This Program. Ensure The Following Files Are Present And Correctly Configured:

• Caesar_Cipher.h
• Atbash_Cipher.h
• ROT13_Cipher.h
• Vigenere_Cipher.h
• Polybius_Cipher.h
• Polybius_Cipher_Custom.h

Compilation

To Compile The Program, Run The Following Command:

g++ -o ZYPHER main.cpp -I ../include

This Assumes The Source Code Is In main.cpp And The Necessary Header Files Are In The ../include Directory.

Running The Program

To Run The Compiled Binary, Execute:

./ZYPHER

You Will Be Presented With A Menu To Either encrypt or decrypt Text.

Usage

Once The Program Runs, It Presents You With A Menu For Either encryption or decryption:

1. Choose The Mode:

   • 1 > Encryption
   • 2 > Decryption

2. Choose A Cipher:

   • 1 > Caesar Cipher
   • 2 > Atbash Cipher
   • 3 > ROT13 Cipher
   • 4 > Vigenère Cipher
   • 5 > Polybius Cipher (Standard)
   • 6 > Polybius Cipher (Custom)

3. Input Text:

   • Enter The Text You Want To Encrypt or Decrypt.

4. Input Additional Parameters:

   • For Caesar Cipher, You'll Need To Provide A Key (A Shift Value).
   • For Vigenère Cipher, You'll Need To Provide A Keyword.
   • For Polybius Ciphers, Just Enter The Text, As No Additional Parameters Are Required.

5. Get Result:

   • The Program Will Output The Result of The Encryption or Decryption Based On Your Input.

Example Walkthrough

Here’s How You Might Encrypt Text Using The Caesar Cipher:

1. Choose Encryption.
2. Select Caesar Cipher.
3. Input Your Text, For Example: Hello World.
4. Enter A Shift Key, For Example: 3.
5. The Program Will Output The Encrypted Text (With The Key You Entered).

Error Handling

• If An Invalid Choice Is Entered (Either For The Cipher or For The Encryption/Decryption Mode), The Program Will Prompt The User To Select A Valid Option.
• If The User Enters Invalid Text or A Key, Appropriate Error Messages Will Be Displayed.

Available Ciphers

1. Caesar Cipher

• Description: A Simple Substitution Cipher Where Each Letter In The Plaintext Is Shifted By A Certain Number of Positions In The Alphabet.
• usage: Enter The Text And A Shift Key To Encrypt or Decrypt.

2. Atbash Cipher

• Description: A Substitution Cipher Where The Alphabet Is Reversed. A Becomes Z, B Becomes Y, And So On.
• Usage: Enter The Text To Encrypt or Decrypt.

3. ROT13 Cipher

• Description: A Special Case of The Caesar Cipher With A Fixed Shift of 13 Positions.
• Usage: Enter The Text To Encrypt or Decrypt (ROT13 Is Its Own Inverse).

4. Vigenère Cipher

• Description: A Polyalphabetic Cipher That Uses A Keyword For Encryption And Decryption. The Key Repeats Over The Plaintext.
• Usage: Enter The Text And A Keyword To Encrypt or Decrypt.

5. Polybius Cipher (Standard)

• Description: A Cipher That Uses A 5x5 Grid of Letters. Each Letter Is Represented By A Pair of Digits (Row And Column).
• Usage: Enter The Text To Encrypt or Decrypt.

6. Polybius Cipher (Custom)

• Description: Similar To The Standard Polybius Cipher But With A Customizable 5x5 Grid.
• Usage: Enter The Text To Encrypt or Decrypt.

Contributing

Feel Free To Fork This Repository And Contribute Enhancements, Bug Fixes, or New Ciphers. Pull Requests Are Welcome!

License

This Project Is Licensed Under The MIT License