код на основе crypto.

package com.javarush.task.task18.task1826; import java.security.InvalidKeyException; import java.security.NoSuchAlgorithmException; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.KeyGenerator; import javax.crypto.NoSuchPaddingException; import javax.crypto.SecretKey; public class DESTest { public static void main(String[] argv) { try{ KeyGenerator keygenerator = KeyGenerator.getInstance("DES"); SecretKey myDesKey = keygenerator.generateKey(); Cipher desCipher; // Create the cipher desCipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); // Initialize the cipher for encryption desCipher.init(Cipher.ENCRYPT_MODE, myDesKey); //sensitive information byte[] text = "No body can see me".getBytes(); System.out.println("Text [Byte Format] : " + text); System.out.println("Text : " + new String(text)); // Encrypt the text byte[] textEncrypted = desCipher.doFinal(text); System.out.println("Text Encryted : " + textEncrypted); // Initialize the same cipher for decryption desCipher.init(Cipher.DECRYPT_MODE, myDesKey); // Decrypt the text byte[] textDecrypted = desCipher.doFinal(textEncrypted); System.out.println("Text Decryted : " + new String(textDecrypted)); }catch(NoSuchAlgorithmException e){ e.printStackTrace(); }catch(NoSuchPaddingException e){ e.printStackTrace(); }catch(InvalidKeyException e){ e.printStackTrace(); }catch(IllegalBlockSizeException e){ e.printStackTrace(); }catch(BadPaddingException e){ e.printStackTrace(); } } }