code: public static byte[] decrypt(byte[] cipherBytes) {
  		try {
  //			byte[] cipherBytes = toBytes(cipherText);
  			Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING", "SunJCE");
  			SecretKeySpec key = new SecretKeySpec(ENCRYPTION_KEY.getBytes("UTF-8"), "AES");
  			cipher.init(Cipher.DECRYPT_MODE, key, new IvParameterSpec(IV.getBytes("UTF-8")));
  			return cipher.doFinal(cipherBytes);
  		} catch (Exception e) {
  			throw new JKSecurityException(e);
  		}
  	}
docs: Decrypt.
  
  @param cipherText the cipher text
  @return the string