Editing Security token (section)

==== Bluetooth tokens ====
{{tone|section|date=September 2016}}

The [[Bluetooth Low Energy]] protocols provide long lasting battery lifecycle of wireless transmission.

* The transmission of inherent Bluetooth identity data is the lowest quality for supporting authentication. 
* A bidirectional connection for transactional data interchange serves for the most sophisticated authentication procedures.

Although, the automatic transmission power control attempts for radial distance estimates. The escape is available apart from the standardised Bluetooth power control algorithm to provide a calibration on minimally required transmission power.<ref>{{cite web|url=http://depatisnet.dpma.de/DepatisNet/depatisnet?action=bibdat&docid=DE102009039879B9|title=Verfahren zum Steuern der Freigabe einer Einrichtung oder eines Dienstes, als Master ausgebildete Sendeempfangseinrichtung sowie System mit derartiger Einrichtung|website=dpma.de|access-date=16 April 2018}}</ref>

Bluetooth tokens are often combined with a USB token, thus working in both a connected and a disconnected state. Bluetooth authentication works when closer than {{convert|32|ft|m|abbr=off|sp=us}}. When the Bluetooth link is not properly operable, the token may be inserted into a [[Universal Serial Bus|USB]] [[input device]] to function.

Another combination is with a [[smart card]] to store locally larger amounts of identity data and process information as well.<ref>{{cite web |url=https://www.certgate.com/de/produkte/cgtoken |title=cgToken {{!}} certgate |website=www.certgate.com |url-status=dead |archive-url=https://web.archive.org/web/20131009094610/http://www.certgate.com/de/produkte/cgtoken/ |archive-date=2013-10-09}}</ref> Another is a contactless BLE token that combines secure storage and tokenized release of fingerprint credentials.<ref>{{cite web|url=https://www.hypr.com/biometric-token/|title=Biometric U2F OTP Token - HYPR|website=HYPR Corp|access-date=16 April 2018}}</ref>

In the USB mode of operation sign-off requires care for the token while mechanically coupled to the USB plug. The advantage with the Bluetooth mode of operation is the option of combining sign-off with distance metrics. Respective products are in preparation, following the concepts of electronic leash.