public void assureIntegrity(){
        MessageDigest digest;
		try {
			digest = MessageDigest.getInstance("MD5");
			messageDigest=digest.digest((username+message).getBytes("UTF-8"));

		}catch (NoSuchAlgorithmException e1){
			e1.printStackTrace();
		}
		catch(UnsupportedEncodingException e2){
			e2.printStackTrace();
		}
		
	}