Crypto Codes

This project contains 13 cryptography algorithms implemented in Java. The algorithms demonstrate various classical encryption and decryption methods, along with N-gram operations for text processing. This repository provides the full source code for each algorithm.

Project Structure

Crypto Codes 
├── src # Source code 
| └── cryptography # Cryptography algorithm implementations 
|     ├── Affine.java
|     ├── Atbash.java
|     ├── August.java
|     ├── Autoclave.java
|     ├── Beaufort.java
|     ├── Caesar.java
|     ├── Gronsfeld.java
|     ├── Hill.java
|     ├── Myszkowski.java
|     ├── NGramOperations.java # N-gram operations for text processing 
|     ├── RailFence.java
|     ├── Route.java
|     └── Vignere.java
├── Output.txt 
└── Readme.md # Project description

Algorithms

The following cryptographic algorithms are implemented in this project:

1. Caesar Cipher
   A substitution cipher where each letter is shifted by a fixed number.

2. Atbash Cipher
   A simple substitution cipher where the alphabet is reversed.

3. August Cipher
   A polyalphabetic substitution cipher similar to Caesar cipher with shift of 1.

4. Affine Cipher
   A cipher based on linear transformations of the alphabet.

5. Vigenere Cipher
   A polyalphabetic substitution cipher that uses a keyword to determine the shifts.

6. Gronsfeld Cipher
   A variant of the Vigenere cipher using digits (0-9) as the key.

7. Beaufort Cipher
   A cipher similar to the Vigenere cipher but uses a reversed alphabet for encryption.

8. Autoclave Cipher
   Also known as the Running Key cipher, it uses a key of arbitrary length to encrypt the message.

9. Ngram Operations
   Generates N-grams (unigrams, bigrams, trigrams, etc.) from input text for text analysis and prediction.

10. Hill Cipher
    A polygraphic substitution cipher based on matrix multiplication.

11. Rail Fence Cipher
    A transposition cipher that arranges text in a zigzag pattern across multiple rails.

12. Route Cipher
    A transposition cipher where the plaintext is written into a grid and then read in a specific route.

13. Myszkowski Cipher
    A transposition cipher using a keyword to reorder columns and transpose them.

How to Use

1. Clone or download this repository.

2. Open the project in your preferred Java IDE (e.g., IntelliJ IDEA, Eclipse, or VSCode).

3. Navigate to the src/cryptography folder.

4. Each algorithm is implemented in its own .java file. You can run any of the classes directly to test the encryption and decryption functionalities.

   Example for running the Caesar Cipher:

   • Open Caesar.java.
   • Run the main method to see the encryption and decryption in action.

5. For N-gram operations, run the NGramOperations.java to see how the text can be split into unigrams, bigrams, and trigrams.

Requirements

• Java Development Kit (JDK) version 8 or higher.
• No additional libraries are required for this project.

License

This project is open-source and available under the MIT License.

Author

Sanjeeth Manikandan