chip foundries. Critics Currently (2011-07) there is no certified product according to ISO/IEC 15408 security requirements on offer. However any workable solution is better than nothing compared to logged-in work positions left unobserved. Freeware implementation Well known implementation is Linux and Windows available BlueProximity solution. The hosting on PC like systems allows for detecting presence of mobile phones in proximity to PC-attached Bluetooth dongle or equivalent interface. PC gets locked on leave. Reported and other simple deficiencies of this solution are: just local locking logically independent of other security means wide variety of overall receiver sensitivity and RSSI feedback dynamics wide variety of transmitter efficiency adjusting to RSSI feedback varying lock-up distance with any combination of transmitter and receiver manual setting the pairing of mobile phone and PC interface no integration to network authentication and authorisation management no integration to user role management and access credentials for application access lack of protection against MIM attacking and other relevant attacking concepts However this Bluetooth based approach is the best protected solution compared to other proprietary approaches without means comparable to mobile phone SIM locking or to Bluetooth link protection. Advantages Basic infrastructure requirements with wireless locking are very low. There are no additional server function requirements beyond public key infrastructure standards. The infrastructure requirement to include wireless receiver to protected objects via integration or using dongles is state-of-the-art. All tampering may be detected automatically. Attachment of receiver/transmitter in dongle shaping to protected object is easily made via USB port. Small security application will make use of protection mechanisms of operating system of protected object. Neither dongle nor protected unit may be compromised as long as any tampering of security application gets detected. Major advantage with wireless locking comes with automating log-off. Hence common lacking of caution by mobile users may be entirely compensated. Automatic wireless authentication factors do not require any handling. The only requirement to the user just to wear a token without any keying is unsurpassed in comfort and functional value. Wireless locking provides additional security for networks against fraudulent access and usage. Reported security deficits with second factor authentication may be compensated by reducing all burdens with keeping, handling and wearing such factors. Transmission power of the wireless token for the object may be very low in the 1 mW range, as just the distance between the bearer and the item to be protected shall be bridged. That