• Description:
  MD5 (Message-Digest Algorithm 5) is a widely used cryptographic hash function that produces a fixed 128-bit hash value from an input message, regardless of its size. It transforms data into a unique, irreversible hash, ensuring integrity by detecting any changes made to the original file. MD5 is commonly used for checksums, digital signatures, and verifying file integrity but does not provide encryption or decryption in the traditional sense.
  
  
  The MessageDigest class handles MD5 hashing. To hash a file, read the file’s content as bytes, pass the data to the MessageDigest instance initialized with the "MD5" algorithm, and generate the hash. The output is a byte array that represents the unique hash value of the file. This hash can be encoded as a hexadecimal string for easier storage or comparison.
  
  Since MD5 produces a one-way hash, reversing it to retrieve the original data is not possible. It serves as a tool for integrity verification rather than data encryption. Although MD5 remains widely used, its vulnerability to collision attacks limits its application in security-critical environments. For stronger security, consider using modern alternatives like SHA-256.
  
  In file verification processes, compare the computed hash of the file with a previously stored hash to detect tampering or corruption. Properly handling file input and output streams ensures efficient processing and minimizes resource usage. Despite its limitations, MD5 remains useful in scenarios where speed and file integrity checks take precedence over strong cryptographic security.

• To start the encryption process, select the input file path after setting up the MD5 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 encrypt method reads the plain text from an input file, uses AES encryption with the provided secret key, and writes the encrypted data to an output file. It initializes the AES cipher in encryption mode and applies the doFinal method to encrypt the data. If successful, it saves the encrypted content to the specified output file and prints a confirmation message.
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• To start the decryption process, select the input file path after setting up the MD5 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 decrypt method reads the encrypted data from an input file, uses AES decryption with the provided secret key, and saves the decrypted content to an output file. It initializes the AES cipher in decryption mode and applies the doFinal method to decrypt the data. The decrypted content is then written to the specified output file. A success message is displayed once the decryption is complete.
• Read Encrypted File: The readFile method reads the entire content of a file at Encrypted text file path and returns it as a byte array. It uses Files.readAllBytes() for efficient reading, handling file input as a stream of bytes.
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• To incorporate a secret key with MD5, combine the key with the input data before hashing, creating an HMAC (Hash-Based Message Authentication Code) for added integrity and authenticity.
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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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