private function get_plugins_thumbprint( $plugins ) {
            ksort( $plugins );

            $thumbprint = '';
            foreach ( $plugins as $basename => $data ) {
                $thumbprint .= $data['slug'] . ',' .
                               $data['Version'] . ',' .
                               ( $data['is_active'] ? '1' : '0' ) . ';';
            }

            return md5( $thumbprint );
        }