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Proximity locks?


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#1 DarkBeer

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Posted 17 October 2014 - 02:40 PM

Does anyone have suggestions for a proximity based solution for locking a PC?  I've been looking at the GateKeeper by GK-Chain as one possible solution, but wondered if there were any other suggestions people have used successfully?  I also tried BT Proximity (pairing phone to laptop), but that hasn't been reliable.  I would like a wireless proximity (Bluetooth, HID, etc) solution that would lock a user's computer if they walk away from it.  Thanks for any suggestions!



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#2 Didier Stevens

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Posted 19 October 2014 - 05:08 AM

I have a DIY solution, it's something I made a couple of years ago:

http://blog.didierstevens.com/2011/04/06/lockifnothot/


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#3 DarkBeer

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Posted 19 October 2014 - 04:24 PM

I appreciate the idea!  I'm looking for something that would eventually be rolled out to 100+ users. 



#4 Crazy Cat

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Posted 19 October 2014 - 08:27 PM

Does anyone have suggestions for a proximity based solution for locking a PC?  I've been looking at the GateKeeper by GK-Chain as one possible solution, but wondered if there were any other suggestions people have used successfully?  I also tried BT Proximity (pairing phone to laptop), but that hasn't been reliable.  I would like a wireless proximity (Bluetooth, HID, etc) solution that would lock a user's computer if they walk away from it.  Thanks for any suggestions!

Since you want a wireless proximity device, then I suggest the following?

(1) Wireless mouse circuit. http://www.seekic.com/circuit_diagram/Computer-Related_Circuit/Wireless_mouse_circuit.html
RF transmitter TDA1808, & encoding circuit MC145026, diagram 2, is either a wrist band, broach, or on the ID around their neck.
Receiver TDA1809, decoding circuit MC145027, diagram 1, is connected into the USB port on the laptop or desktop.

(2) Coded RF chips.
Bluetooth Smart/Bluetooth low energy. http://www.nordicsemi.com/eng/Products/Bluetooth-Smart-Bluetooth-low-energy
2.4GHz RF. http://www.nordicsemi.com/eng/Products/2.4GHz-RF

Locking the laptop or desktop with the Windows OS.

Lock workstation. http://ss64.com/nt/rundll32.html
RUNDLL32.exe user32.dll, LockWorkStation
29.Logoff Windows. http://www.robvanderwoude.com/rundll.php#Logoff
RUNDLL32 USER32.DLL,ExitWindowsEx
RUNDLL32 USER32.DLL,ExitWindowsEx
There are also non-wireless proximity circuits (very cheap) if your interested?

Edited by Crazy Cat, 19 October 2014 - 08:29 PM.

 

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