Since Version 11, Nextcloud supports Universal Second Factor (U2F) login within compatible browsers. Finally, Nextcloud‘s Android client provides U2F in version 3.8. On Android, there is no U2F API available in a WebView, Android’s in-app browser view, which is used by Nextcloud for its login flow. COTECH’s Hardware Security SDK changed that. It hides away the difficulties of communicating with security key and provides an easy API for developers. So that Nextcloud can bring U2F to its Androids users.