How to Implement DES Encryption and Decryption of a Text File using Java?
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Condition for Encrypt and Decrypt Text File using DES in Java
Description: AES (Advanced Encryption Standard) is a symmetric encryption algorithm that uses the same key for both encryption and decryption. It processes data in fixed-size blocks of 128 bits with key sizes of 128, 192, or 256 bits. In Java, the Cipher class performs encryption and decryption using the AES transformation. The KeyGenerator or SecretKeySpec class generates or specifies the secret key. During encryption, plaintext is converted into ciphertext, and decryption reverses this. The encrypted data and key must remain confidential to ensure security. File I/O operations handle reading plaintext, encrypting it, and writing ciphertext to a file. Exception handling is necessary to address errors that may arise during the process.
jLabel1 = new javax.swing.JLabel();
jLabel2 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
jButton1 = new javax.swing.JButton();
jLabel3 = new javax.swing.JLabel();
jTextField2 = new javax.swing.JTextField();
jButton2 = new javax.swing.JButton();
jButton3 = new javax.swing.JButton();
jScrollPane1 = new javax.swing.JScrollPane();
jTextArea1 = new javax.swing.JTextArea();
jButton4 = new javax.swing.JButton();
To start the encryption process, select the input file path after setting up the DES encryption GUI.
Step 2
The chosen file location is indicated by the selected file path that shows up in the text field.
Step 3
Select the path of the 'Encrypt.txt' file to begin the encryption process.
Step 4
The path of the 'Encrypt.txt' file has been selected for encryption.
Step 5
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 DES algorithm with a provided secret key, and writes the encrypted data to a new output file. It uses the Cipher class in DES encryption mode to process the data. If successful, it saves the encrypted file and prints a success message; otherwise, it handles exceptions.
Step 6
To start the decryption process, select the input file path after setting up the DES decryption GUI.
Step 7
The chosen file location is indicated by the selected file path that shows up in the text field.
Step 8
Select the path of the 'Decrypt.txt' file to begin the decryption process.
Step 9
The path of the 'Decrypt.txt' file has been selected for decryption.
Step 10
The files Encrypt.txt and Decrypt.txt are chosen. When the Decrypt button is clicked, decryption is successfully finished.
The decrypt method uses Data Encryption Standard (DES) 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.
Read Encrypted File: The readFile method reads the entire content of a file at the 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.
Step 11
Use the same secret key for both encryption and decryption to maintain consistency and ensure accurate data retrieval.
Secret Key: The server generates a Data Encryption Standard (DES) secret key and saves it to a file for secure storage. The client-side application, with a GUI, loads this key from the file when needed. The key is then used for encryption processes in the client-side operations
Step 12
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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