if (StringUtil.isBlank(userCode)) {
            return null;
        }

        userCode = createUserCodeFromUserId(userCode);
        request.setAttribute(Constants.USER_CODE, userCode);
        deleteUserCodeFromCookie(request);
        return userCode;
    }

    /**
     * Creates an encrypted user code from a user ID.
     * The user ID is encrypted using the primary cipher and validated against the configuration.