Didier Stevens

Wednesday 6 April 2011

LockIfNotHot

Filed under: Hardware — Didier Stevens @ 8:34

When Phidget came out with this new IR temperature sensor, a lightbulb went off. This sensor measures temperature without contact. Point it to the chair in front of your computer, and it will measure your body temperature. Or the temperature of your chair, if you’re not sitting in front of your computer.

And that’s the idea: I wrote a program that locks your Windows workstation when you leave your chair (e.g. when the temperature drops).

In this screenshot, LockIfNotHot is configured to lock the workstation when the temperature drops below 25°C during 3 seconds and there is no user input during 2 seconds.

Once the workstation is locked, you need to provide your Windows account password to unlock it.

Download:

LockIfNotHot_V0_0_1.zip (https)

MD5: 188BE76E0A5BCCA26A8736F8F0C4061C

SHA256: CA915265D3B224DF3AA95E5C59B7C0E7EDF239DF50FC1C03F2C991A8B1800AD2

31 Comments »

  1. [...] oltre che di molte altre cose legate alla sicurezza, quella vera, non le chiacchiere, ha rilasciato una semplicissima applicazione che potrebbe essere l’uovo di Colombo, per alcune [...]

    Pingback by Blocca il computer quando ti alzi. No, aspetta, ho una idea migliore! « Il non-blog di Mario Pascucci — Wednesday 6 April 2011 @ 9:00

  2. Hehe :) Impressive, Didier. You always has something up your sleeve to impress us.

    Comment by Manuel — Wednesday 6 April 2011 @ 21:15

  3. Amazing how your mind find this opportunity and implement in security… Cheers!!

    Comment by zack — Thursday 7 April 2011 @ 0:31

  4. [...] Czujnik temperatury blokuje komputer, jeśli od niego odchodzisz. Program do pobrania tu. [...]

    Pingback by » * Blokada komputera czujnikiem temperatury -- Niebezpiecznik.pl -- — Thursday 7 April 2011 @ 6:29

  5. [...] Read More : Didier Stevens [...]

    Pingback by Lock Windows when you leave your chair using a IR sonsor — MercenaryMind — Thursday 7 April 2011 @ 22:00

  6. [...] to tell us about a little piece of PC security software he put together recently. His application, LockIfNotHot, works in conjunction with your PC as well as an IR temperature sensor in order to lock your [...]

    Pingback by Body heat sensing PC security system - Hack a Day — Friday 8 April 2011 @ 11:05

  7. [...] to tell us about a little piece of PC security software he put together recently. His application, LockIfNotHot, works in conjunction with your PC as well as an IR temperature sensor in order to lock your [...]

    Pingback by Body heat sensing PC security system - machine quotidienne — Friday 8 April 2011 @ 18:11

  8. [...] Share speed equally ^^ The closest app that came to do such thing is a tool, called, LockIfNotHot, which locks your windows, as soon as you get up from your computer. It uses an Infrared monitor, [...]

    Pingback by Share speed equally - Digit Technology Discussion Forum — Saturday 9 April 2011 @ 4:09

  9. [...] to tell us about a little piece of PC security software he put together recently. His application, LockIfNotHot, works in conjunction with your PC as well as an IR temperature sensor in order to lock your [...]

    Pingback by Body heat sensing PC security system « Black Hat Security — Saturday 9 April 2011 @ 11:38

  10. [...] LockIfNotHot: program uses IR heat sensor to detect a drop in temperature when you leave your chair and then auto-locks your Windows workstation. Program written by Didier Stevens.Source:http://blog.didierstevens.com/2011/04/06/lockifnothot/ [...]

    Pingback by IR heat sensor detects when you leave your chair & auto-locks PC - wehaveways's posterous — Saturday 9 April 2011 @ 21:16

  11. hey, I would really like to use the “LockIfNotHot” application.
    but, when I tried to run it it said that an unhandled exception has occurred.

    I’m working on windows 7.

    thanks in advance!

    Comment by Yarden — Saturday 9 April 2011 @ 22:25

  12. @Yarden Did you connect the Phidgets IR temperature sensor (ant the drivers)?

    Comment by Didier Stevens — Saturday 9 April 2011 @ 22:39

  13. [...] your chair and then auto-locks your Windows workstation. Program written by Didier Stevens.Source:http://blog.didierstevens.com/2011/04/06/lockifnothot/ [...]

    Pingback by IR heat sensor detects when you leave your chair & auto-locks PC - anacristina's posterous — Saturday 9 April 2011 @ 22:52

  14. oo.. no. I didn’t realize that an additional hardware had to be installed. sorry.

    Comment by Yarden — Saturday 9 April 2011 @ 22:53

  15. [...] technology for the paranoid and forgetful. A developer has written an application for PCs that [...]

    Pingback by Sensor Locks Your PC By Detecting Body Heat | Technology and Machines — Sunday 10 April 2011 @ 23:19

  16. [...] a unique bit of technological innovation for the paranoid and forgetful. A developer has written an application for PCs that locks your laptop or computer if you are not at your desk. [...]

    Pingback by Sensor Locks Your PC By Detecting Body Heat | guide2gadget.com — Monday 11 April 2011 @ 2:47

  17. [...] source: LockIfNotHot [...]

    Pingback by Auto lock your PC with body heat reading (video) « Tekarazzi — Monday 11 April 2011 @ 17:45

  18. [...] can download LockIfNotHot for free from Stevens’ blog, but of course it’s useless without the IR temperature sensor, and that’ll set you back [...]

    Pingback by LockIfNotHot Locks PC If Temperature Drops, Not If User is Ugly - Technabob — Wednesday 13 April 2011 @ 12:58

  19. you realize that this works well in iceland and syberia.

    here in Portugal, today was around 28ºC. in the summer, goes to 40ºC…

    Comment by john doe — Saturday 16 April 2011 @ 2:00

  20. @john doe But you are a mammal, right, and you enjoy the benefits of thermoregulation?

    Comment by Didier Stevens — Saturday 16 April 2011 @ 6:10

  21. [...] kurtulmuş oluyorsunuz. LockIfNotHot adlı bu uygulama hakkında detaylı bilgi için buraya [...]

    Pingback by Sıcaklığınızı tanıyarak çalışan yazılım | Son Dakika Haberler — Monday 18 April 2011 @ 6:46

  22. [...] derdinden kurtulmuş oluyorsunuz. LockIfNotHot adlı bu uygulama hakkında detaylı bilgi için buraya [...]

    Pingback by Sıcaklığınızı tanıyarak çalışan yazılım | Sohbetdemi.com, Maynet sohbet, Maynet, Sohbet, Maynet Haber, Sohbett, Maynet odaları — Monday 18 April 2011 @ 22:13

  23. [...] LockIfNotHot Tagged with: heat • IR • lock • lockifnothot • locking windows • sensor [...]

    Pingback by Auto lock your PC with body heat reading (video) | Tekarazzi — Monday 18 April 2011 @ 23:11

  24. This is awesome. But probably wouldn’t work at my place most of the time, where the cat likes to occupy the keyboard as soon as real human leaves the seat. The cat body temperature is 37′C thu, so maybe with a little of diff. analysis it would be possible to detect the difference :)

    Comment by FY — Friday 22 April 2011 @ 2:01

  25. @FY if you put the sensor on top of your monitor, it won’t see the cat on the keyboard.

    Comment by Didier Stevens — Friday 22 April 2011 @ 8:12

  26. [...] If Not Hot – Lock a computer automatically when you leave it (but with a twist) Required Lock If Not Hot [...]

    Pingback by Lock If Not Hot - Lock a computer automatically when you leave it (but with a twist) — Friday 22 April 2011 @ 12:06

  27. [...] Didier Sevens, a security researcher from Brussels, Belgium, created a program that can lock your PC judging by the heat signals that it receives.  LockIfNotHot locks the PC when the heat sensor attached to the system registers a temperature drop below  25°C for about 3 seconds or when the working stations doesn’t receive heat impulses from the user. [...]

    Pingback by Lock Your PC With Your Body’s Heat | Technostats — Monday 2 May 2011 @ 20:11

  28. [...] to tell us about a little piece of PC security software he put together recently. His application, LockIfNotHot, works in conjunction with your PC as well as an IR temperature sensor in order to lock your [...]

    Pingback by MVFenda :: Body heat sensing PC security system :: MVFenda — Tuesday 17 May 2011 @ 1:26

  29. What if you drink a coffee and leave it beside your computer when you leave?

    Comment by 1111 — Saturday 18 February 2012 @ 12:08

  30. @1111 That’s no problem at all. The sensor doesn’t pick up ambient temperature, but it has a small viewing angle in which it measures the temperature of bodies radiating heat.
    I won’t “see” the coffee.

    Comment by Didier Stevens — Saturday 18 February 2012 @ 22:02

  31. Cool, thanks for the suggestion..

    Comment by Anonymous — Sunday 12 January 2014 @ 20:36


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