• Description:
  To secure data efficiently, Twofish offers a symmetric key encryption algorithm with support for key sizes of 128, 192, or 256 bits and processes data in 128-bit blocks. It employs techniques like key-dependent S-boxes, pre-whitening, and post-whitening to strengthen security. Since Java does not provide native support for Twofish, integrating a third-party library like BouncyCastle becomes essential. Adding BouncyCastle to the project can be done by including its JAR file or configuring it through a dependency manager like Maven. The Cipher class, initialized with the "Twofish" algorithm, handles encryption and decryption operations.
  A SecretKey is either generated or loaded to provide the cryptographic key. The Cipher instance must operate in ENCRYPT_MODE or DECRYPT_MODE based on the intended task. For processing text files, CipherOutputStream and CipherInputStream manage secure data streams. Padding schemes, such as PKCS5Padding, ensure that the data aligns with the required block size. Managing exceptions like InvalidKeyException and NoSuchAlgorithmException ensures smooth execution, and closing file streams properly prevents data corruption and resource leaks.

• To start the encryption process, select the input file path after setting up the Twofish encryption GUI.
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• The chosen file location is indicated by the selected file path that shows up in the text field.
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• Select the path of the 'Encrypt.txt' file to begin the encryption process.
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• The path of the 'Encrypt.txt' file has been selected for encryption.
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• The files Encrypt.txt and input.txt are chosen. When the Encrypt button is clicked, encryption is successfully finished.
• The code reads the content of a text file, encrypts it using the TwoFish algorithm with a provided secret key, and writes the encrypted data to a new output file. It uses the Cipher class in TwoFish encryption mode to process the data. If successful, it saves the encrypted file and prints a success message; otherwise, it handles exceptions.
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• To start the decryption process, select the input file path after setting up the Twofish decryption GUI.
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• The chosen file location is indicated by the selected file path that shows up in the text field.
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• Select the path of the 'Decrypt.txt' file to begin the decryption process.
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• The path of the 'Decrypt.txt' file has been selected for decryption.
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• The files Encrypt.txt and Decrypt.txt are chosen. When the Decrypt button is clicked, decryption is successfully finished.
• The decrypt method uses TwoFish Algorithm to decrypt data from an encrypted file. It initializes a Cipher in decryption mode with the provided secret key and decrypts the byte array read from the input file. Finally, it writes the decrypted data to the specified output file, handling any exceptions that might occur.
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• Use the same secret key for both encryption and decryption to maintain consistency and ensure accurate data retrieval.
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• Encryption applies to the input text file, with the result saved in the encrypt text file. Decryption restores the original content from the decrypt text file.
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