Alerting Against Unlocked Doors

Author: Ethan Ace, Published on May 12, 2012

 

Unlocked doors are a key vulnerability of many access control systems. While a door may be closed, it can easily be kept unlocked, allowing an adversary to later enter without any authentication. Adding lock status monitoring can prevent this. In this note, we explain the risks, the solution, its cost and implementation.

Why ***** * **** **?

*********** *** ****** ******** ******* *** ******** **** ******* *** simply. ******** ******* *** ** ******** ** ******* ******* ******* in *** ******, ** *** ********* ***** ***** *******. ********** may **** ** **** ** **** **** ** ********** **** so **** ***** ****** ** ***. ******** ***** ******** ***** amounts ** ******* *****, *** **** **** *** ****** *** the ****** ***** ***** *** ****** *****. ******* ***** ***** drastically ** *** *** *** **** ******* *****, **** ********** of ** ****. ** ******** * *******’* ******* ***** ** a ***** ***** ** *** ** ****** ****** ** ** easy ** ********* *** ***-******** ******** ******* *** **** *** strike *****. ******** *** ******* *** **** ******.

********, ******** ** ****** ***** ***** **** **** ********, ***** they *** **** ******* ***** *****. ****** *** ***** ** while ** *** ** ******, ******** *** ********** ***** *****, returning *****, ****** ********** ** **** ***********, *** **** **** entry ******* *** ****. ********* *** **** ****** ** ****** the ****, *******, ********* ****-**** ***** **** *** ** ******, most ********, ****** *** ***.

What ** **?

****** ***, **** ******* ******** **** * **** ** ****** and ******. *********, ** ******-********** **** ******** * ******, * request-to-exit, * **** ********, *** * **** ** **** ****. The **** ******** ****** ***** *** ****** ******* *** **** is **** ** ******. ** ** **** **** *** ****** and *******-**-**** ****** ** **** ******* * **** *** **** forced **** ** ** * ***** **** **** ** *******-**-**** has ********. *******, ****** ******* ******* *** **** ** **** or ****** **** *** ******** ******* ** ** ****** ** unlocked, ** ******** ***** ** *** ****** ***** *****.

***** **** ********** ******** **** ****** ******** ***** **** ****, in ******** ** *** ***** *****.

****'* ** ***** ******* *** ******** ** *** ********** ****** inside * ****:

**** *** **** ** *******, *** ******* ******. **** ***, the ****** *** *** **** *** **** ** ******. ** monitor ********* ******, * *********** ******* ******* *** ********* *** fully ******** **** *** ****** ******. ******** **** ******* ******* whether *** ****** ***** *** ******** ******** *** ******* *** holding ********. ***** ******** *** *** ****, *******. ***** ****** expect ************* **-**% ***** **** *** ****, ** ~$**-$**.

** *** **** ** ***** ******* **** *******, ******** **** typically **** ** ** ********. **** ******* ************* ******* * bond ****** ******** *** *** ***** *****, *** *** ***. We **** ** ** ******** **** *** ******** *******.

How ** ** ****?

*** ******** *** ** *** **** ********** ** ** **** the ******** ** ****** **** *** **** ******** ******. ****, instead ** ****** ******* * **** ** **** ** ******, the ****** ***** *** ** ** **** *** *** ****** or ****** *** ******. **********, **** ********** ******* *** ** run ** ******** ****** *** **** ******** **********. ** *** wants ** ******* **** ****** **********, **** ****** *** **** be ****** ** ******* *********. ***** ******** ****** *** *** that ****** ** **** ******, *** ** ******* ***** ********** signals ****** ** ********* **********. ***** **** ********** ****** ********** systems ******* **** ****** ** * ****** *****, *** ***** software ******* ****, ** ******* **** ********** ** ********.

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