Příklad šifrování v Javě pomocí metody DES.
String phrase = “Your secret Key phrase”;public String encrypt(String text) throws InvalidKeyException,UnsupportedEncodingException, NoSuchAlgorithmException,InvalidKeySpecException, NoSuchPaddingException,IllegalBlockSizeException, BadPaddingException {DESKeySpec keySpec = new DESKeySpec(phrase.getBytes(“UTF8″));SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(“DES”);SecretKey key = keyFactory.generateSecret(keySpec);sun.misc.BASE64Encoder base64encoder = new BASE64Encoder();// ENCODE plainTextPassword Stringbyte[] cleartext = text.getBytes(“UTF8″);Cipher cipher = Cipher.getInstance(“DES”); // cipher is not thread safecipher.init(Cipher.ENCRYPT_MODE, key);return base64encoder.encode(cipher.doFinal(cleartext));// now you can store it}public String decrypt(String s) throws IllegalBlockSizeException,BadPaddingException, InvalidKeyException, InvalidKeySpecException,NoSuchAlgorithmException, NoSuchPaddingException, IOException {sun.misc.BASE64Decoder base64decoder = new BASE64Decoder();// DECODE encryptedPwd Stringbyte[] encrypedPwdBytes = base64decoder.decodeBuffer(s);DESKeySpec keySpec = new DESKeySpec(phrase.getBytes(“UTF8″));SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(“DES”);SecretKey key = keyFactory.generateSecret(keySpec);Cipher cipher = Cipher.getInstance(“DES”);// cipher is not thread safecipher.init(Cipher.DECRYPT_MODE, key);byte[] plainTextPwdBytes = (cipher.doFinal(encrypedPwdBytes));return new String(plainTextPwdBytes);}