What about encrypt some text/string

Question

What about encrypt a string. I'm troubled to use javax.crypt or java.security. Is anyone would show me how? Just give some example ho to use it. Thank you for all.

Answer 1

I've try something like this :
static JFrame Frame;
static JPanel Panel;
static JLabel Judul;
static JTextArea Terang, Sandi;
static JButton OK;
static Insets lokasi;
static Cipher ecipher,dcipher;
try {
// Generate a DES key
KeyGenerator keyGen = KeyGenerator.getInstance("DES");
SecretKey key = keyGen.generateKey();
//Terang.setText(key.toString());
ecipher = Cipher.getInstance("DES");
dcipher = Cipher.getInstance("DES");
ecipher.init(Cipher.ENCRYPT_MODE, key);
ecipher.init(Cipher.DECRYPT_MODE, key);
// Encode the string into bytes using utf-8
String str="AMRI SHODIQ";
byte[] utf8 = str.getBytes("UTF8");
Terang.setText(utf8.toString());
// Encrypt
byte[] enc = ecipher.doFinal(utf8);
// Encode bytes to base64 to get a string
Sandi.setText(enc.toString());
byte[] dec = dcipher.doFinal(Sandi.getText().getBytes());
str =new String(utf8, "UTF8");
Terang.setText(str);
} catch (javax.crypto.NoSuchPaddingException e) {
} catch (java.security.NoSuchAlgorithmException e) {
} catch (java.security.InvalidKeyException e) {
} catch (IllegalBlockSizeException e) {
} catch (UnsupportedEncodingException e) {
} catch (javax.crypto.BadPaddingException e) {
The compiling was going well but the the result is not what i expected to have. Please give me a favour correcting this code