public static boolean isPassword(String password) {
		if (isNull(password)) {
			return false;
		}

		if (password.length() < 4) {
			return false;
		}

		for (char c : password.toCharArray()) {
			if (!isChar(c) && !isDigit(c)) {
				return false;
			}
		}

		return true;
	}