/**
 * Add Security Key and appropiate tags Enqueued Scripts & Styles.
 *
 * @param string $tag      Script Tags to display.
 * @param string $handle   Name of file specified above.
 */
function script_security_checks( $tag, $handle ) {

	$scripts = array( 'script_handle' );

	foreach ( $scripts as $script ) {
		if ( $script === $handle ) {
			return str_replace( ' src', ' async defer integrity="####-###################-##############" crossorigin="anonymous" src', $tag );
		}
	}
	return $tag;
}
add_filter( 'script_loader_tag', 'script_security_checks', 10, 2 );