$config['csrf_protection'] = TRUE;

<script>
$(function()
{
	$('#content').redactor({
		imageUpload: "/upload/redactor/image",
		fileUpload: "/upload/redactor/file",
		plugins: ['table', 'video'],
		uploadImageFields: {
			<?php echo $this->security->get_csrf_token_name(); ?>: '<?php echo $this->security->get_csrf_hash(); ?>'
		}
	});
});
</script>