![SOURCE CODE IN JAVA
import javax.swing.*;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;
import java.util.Random ;
class DES {
byte[] skey = new byte[1000];
String skeyString;
static byte[] raw;
String inputMessage,encryptedData,decryptedMessage;
public DES() {
try {
generateSymmetricKey();](https://image.slidesharecdn.com/nssppt1-200125113613/85/android-text-encryption-Network-security-lab-by-rohit-malav-4-320.jpg)
![ inputMessage=JOptionPane.showInputDialog(null,"Enter message to encrypt");
byte[] ibyte = inputMessage.getBytes();
byte[] ebyte=encrypt(raw, ibyte);
String encryptedData = new String(ebyte);
System.out.println("Encrypted message "+encryptedData);
JOptionPane.showMessageDialog(null,"Encrypted Data "+"n"+encryptedData);
byte[] dbyte= decrypt(raw,ebyte);
String decryptedMessage = new String(dbyte);
System.out.println("Decrypted message "+decryptedMessage);
JOptionPane.showMessageDialog(null,"Decrypted Data "+"n"+decryptedMessage);
}
catch(Exception e) {
System.out.println(e);
}
}
void generateSymmetricKey() {](https://image.slidesharecdn.com/nssppt1-200125113613/85/android-text-encryption-Network-security-lab-by-rohit-malav-5-320.jpg)
![ try {
Random r = new Random();
int num = r.nextInt(10000);
String knum = String.valueOf(num);
byte[] knumb = knum.getBytes();
skey=getRawKey(knumb);
skeyString = new String(skey);
System.out.println("DES Symmetric key = "+skeyString);
}
catch(Exception e) {
System.out.println(e);
}
}
private static byte[] getRawKey(byte[] seed) throws Exception {
KeyGenerator kgen = KeyGenerator.getInstance("DES");
SecureRandom sr = SecureRandom.getInstance("SHA1PRNG");
sr.setSeed(seed);
kgen.init(56, sr);](https://image.slidesharecdn.com/nssppt1-200125113613/85/android-text-encryption-Network-security-lab-by-rohit-malav-6-320.jpg)
![ SecretKey skey = kgen.generateKey();
raw = skey.getEncoded();
return raw;
}
private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "DES");
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(clear);
return encrypted;
}
private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception {
SecretKeySpec skeySpec = new SecretKeySpec(raw, "DES");
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, skeySpec);
byte[] decrypted = cipher.doFinal(encrypted);
return decrypted;
}
public static void main(String args[]) {
DES des = new DES();
}
}](https://image.slidesharecdn.com/nssppt1-200125113613/85/android-text-encryption-Network-security-lab-by-rohit-malav-7-320.jpg)
android text encryption Network security lab by rohit malav
- 1. NETWORK SECURITY LAB PROJECT PRESENTATION II ANDROID TEXT ENCRYPTION USING DES ALGORITHM SUBMITTED BY: - SUBMITTED TO: - CHANDER KANT SHARMA MS.LAVISHA SAHU
- 2. HOW DOES DESWORK? DESis a symmetric block encryption algorithm. When 64-bit blocks of plaintext go in, 64-bit blocks of cipher text come out. It is also a symmetric algorithm, meaning the same key is used for encryption and decryption. It uses a 64-bit key: 56 bits make up the true key, and 8 bits are used for parity. The blocks are put through 16 rounds of transposition and substitution functions. The result is 64-bit blocks of ciphertext
- 4. SOURCE CODE IN JAVA import javax.swing.*; import java.security.SecureRandom; import javax.crypto.Cipher; import javax.crypto.KeyGenerator; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec; import java.util.Random ; class DES { byte[] skey = new byte[1000]; String skeyString; static byte[] raw; String inputMessage,encryptedData,decryptedMessage; public DES() { try { generateSymmetricKey();
- 5. inputMessage=JOptionPane.showInputDialog(null,"Enter message to encrypt"); byte[] ibyte = inputMessage.getBytes(); byte[] ebyte=encrypt(raw, ibyte); String encryptedData = new String(ebyte); System.out.println("Encrypted message "+encryptedData); JOptionPane.showMessageDialog(null,"Encrypted Data "+"n"+encryptedData); byte[] dbyte= decrypt(raw,ebyte); String decryptedMessage = new String(dbyte); System.out.println("Decrypted message "+decryptedMessage); JOptionPane.showMessageDialog(null,"Decrypted Data "+"n"+decryptedMessage); } catch(Exception e) { System.out.println(e); } } void generateSymmetricKey() {
- 6. try { Random r = new Random(); int num = r.nextInt(10000); String knum = String.valueOf(num); byte[] knumb = knum.getBytes(); skey=getRawKey(knumb); skeyString = new String(skey); System.out.println("DES Symmetric key = "+skeyString); } catch(Exception e) { System.out.println(e); } } private static byte[] getRawKey(byte[] seed) throws Exception { KeyGenerator kgen = KeyGenerator.getInstance("DES"); SecureRandom sr = SecureRandom.getInstance("SHA1PRNG"); sr.setSeed(seed); kgen.init(56, sr);
- 7. SecretKey skey = kgen.generateKey(); raw = skey.getEncoded(); return raw; } private static byte[] encrypt(byte[] raw, byte[] clear) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "DES"); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.ENCRYPT_MODE, skeySpec); byte[] encrypted = cipher.doFinal(clear); return encrypted; } private static byte[] decrypt(byte[] raw, byte[] encrypted) throws Exception { SecretKeySpec skeySpec = new SecretKeySpec(raw, "DES"); Cipher cipher = Cipher.getInstance("DES"); cipher.init(Cipher.DECRYPT_MODE, skeySpec); byte[] decrypted = cipher.doFinal(encrypted); return decrypted; } public static void main(String args[]) { DES des = new DES(); } }
- 8. THANK YOU!!