public boolean verifyIntegrity(){
        MessageDigest digest;
		try {
			digest = MessageDigest.getInstance("MD5");
			if(	Arrays.equals( digest.digest((username+message).getBytes("UTF-8")), messageDigest) ){
				return true;
			}
		} catch (NoSuchAlgorithmException e1){
			e1.printStackTrace();
		}
		catch(UnsupportedEncodingException e2){
			e2.printStackTrace();
		}
		return false;
	}