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CS 51 - RSA Encryption in Java

This project demonstrates an advanced RSA encryption algorithm implemented in Java. The code includes secure random key generation, exception handling, and encryption with decryption capabilities.

Getting Started

Prerequisites

  • Java Development Kit (JDK) 8 or higher

Running the Code

  1. Compile the Code: Open a terminal or command prompt and navigate to the directory containing the EnhancedRSA.java file. Run the following command to compile the code:

    javac EnhancedRSA.java

Code Explanation

  • EnhancedRSA Class:
    • n, e, and d are the RSA keys where n is the modulus, e is the public exponent, and d is the private exponent.
    • The constructor EnhancedRSA(int bitLength) initializes the keys with secure random prime numbers.
    • convertToAscii(String input) method converts the input string into its binary representation.
    • calculate(String msg) method performs the following steps:
      • Converts the message into a binary string.
      • Converts the binary string into a BigInteger.
      • Encrypts the integer message using the RSA algorithm and prints the ciphertext.
      • Decrypts the ciphertext back to the original message and prints it.

Example Output

Running the provided code with the message "Give me an A" will produce an output similar to the following:

Binary String: 010001110110100101110110011001010010000001101101011001010010000001100001011011100010000001000001
Integer Message: 8937694091556108062443830530
Ciphertext: <cipher text>
Decrypted Binary String: 010001110110100101110110011001010010000001101101011001010010000001100001011011100010000001000001
Decrypted Text: Give me an A

Modifying the Code

  • Changing the Bit Length: You can increase the bit length for more security by modifying the bitLength variable in the main method:

    int bitLength = 1024; // Example for increased security

  • Changing the Message: Modify the string passed to the calculate method in the main function:

    rsa.calculate("Your new message");

License

This project is licensed under the MIT License - see the LICENSE file for details.