RSA Encryption and Decryption

This is a Python implementation of the RSA algorithm using the rsa library. The code provides functionalities for generating RSA keys, encrypting messages using public keys, and decrypting messages using private keys.

Prerequisites

To run this code, make sure you have the following:

• Python 3 installed on your system
• The rsa library installed. You can install it using pip install rsa

How to Use

1. Run the code in a Python environment.
2. Choose one of the following options:
   • Option 1: Generate Keys
   • Option 2: Import Keys and Encrypt or Decrypt
3. If you choose to generate keys:
   • Enter the desired strength for your RSA encryption (between 512 and 4096).
   • The code will generate a pair of RSA keys (public and private) and save them as publicKey.pem and privatekey.pem in the chosen directory.
4. If you choose to import keys and encrypt or decrypt:
   • Select whether you want to import a public key (1) or a private key (2).
   • If importing a public key:
     • Choose the public key file by selecting it from a window that will pop up.
     • If you don't see the window, use 'alt + tab' to switch to it.
     • Choose whether you want to encrypt a message using the imported public key.
       • If you choose to encrypt, enter the plaintext message.
       • The code will encrypt the message using the public key and display the encrypted message.
   • If importing a private key:
     • Choose the private key file by selecting it from a window that will pop up.
     • If you don't see the window, use 'alt + tab' to switch to it.
     • Choose whether you want to decrypt a message using the imported private key.
       • If you choose to decrypt, enter the base64-encoded ciphertext.
       • The code will decrypt the ciphertext using the private key and display the decrypted message.

Notes

• When generating keys, note that using stronger encryption (larger key size) will take more time to generate the keys.
• The code utilizes the rsa library for the RSA encryption and decryption operations.
• The base64 library is used for encoding and decoding the encrypted message.
• The tkinter.filedialog library is used to prompt the user for file selection.