• Description:
  Blowfish is a symmetric key block cipher designed to provide fast encryption while maintaining a high level of security. It operates on blocks of 64 bits and supports variable key lengths ranging from 32 bits to 448 bits. Blowfish is known for its efficiency in both hardware and software implementations, making it suitable for encrypting large volumes of data. The same key is used for both encryption and decryption, which requires secure key management to prevent unauthorized access.
  
  Blowfish uses a Feistel network structure with 16 rounds of encryption, where each round involves key-dependent permutations and substitutions. The algorithm divides the input data into fixed-size blocks, encrypting each block independently, which allows parallel processing. Blowfish also employs key expansion and data-dependent S-boxes to enhance its security, making it resistant to known cryptographic attacks such as differential and linear cryptanalysis.
  
  The javax.crypto package provides a straightforward way to implement Blowfish encryption and decryption using the Cipher class. Data is encrypted by initializing the cipher in encryption mode with a secret key, while decryption requires the cipher to be initialized in decryption mode using the same key.

• To start the encryption process, select the input file path after setting up the BlowFish encryption GUI.
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• The choosen 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.
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• To start the decryption process, select the input file path after setting up the Blowfish 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.
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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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