Block user enumeration

function scanForEnumerationAttempt($strRedirectionURL, $strRequestedURL) {
    if (1 === preg_match('/\?author=([\d]*)/', $strRequestedURL)) {
        $strRedirectionURL = false;
    }

   return $strRedirectionURL;
}

add_filter('redirect_canonical','scanForEnumerationAttempt', 10,2);