Low-Tech Access Control: Master Keying Explained

*** ****** **** **** is *** ****** **********. In **** ********, ** explain:

• *** **** ***** ****
• ******* *** '*****' ** Each ***
• *** ***** ***** *** So *********
• *** ****** *** ******* Are *********
• ****** **** ** * Huge ****
• ******* ****** *** *****

*******, ***** *******,**** *** * ******** quiz.

Basic **** ********

*** ****** ** '*** tumbler' ***** ***** *** not ******* ***** *** original ******* ***** ** the *****. *** **** are **** ****** **** globally, **** *** **** the **** ***** ********.

*** ******** *** ***** offers * **** *********** on *** *** *** interacts *** ********** ***** a ****:

*** ********* ** ******: the **** ******** ******* (usually ******* * - 7) ******** **** ** different *******. * *** is **** **** ** turn *** **** ** the '****** ***********' ** key **** ******* *** length ** *** ****.

* ***** *** ******** the ****** ** *** the **** ** ***** top "***** *****" ***** between *** **** (*** part **** *****) *** the ******* (*** ******, outside ****) ** *** lock. ** ******* *** may ** **** ** slide **** *** ****, but *** ****** *** cuts ** *** ******** align *** ****, ********** the **** **** *******.

Codes ****** ****

**** *** *******, *** the ********** ****** ** key **** **** **** them, *** ******** ********* in ****.

* ************ *** **** is **** ****** * locksmith ** *** * replacement *** ***** ****** and **** ** ***** work **** * ****. Various ********** ** * code ****** ******* **** models, **** *** ******** depth ** * ***, the ***** ** * cut, ** **** *** width ** * ***, but *** ************ ** a '*** ****' ** fairly **********.

*******, *** ***** ** a *** ***** **** eight ** **** ******** depths, ***** * "*" depth ********* *** *** is *** *** ** all, *** * "*" cut ******* **** *.***" in ********. ***** *** range ** ****** ** not ***********, * **** is ********* ********, *** even *.***" ******** *** be *** ********** ******* a **** ******* *** remaining ******.

**** *** ****** ** five ** *** ****, the **** ** ********* as * ****** ** depths **** **** ******* representing *** *** ****** for * ***** *** position.

*** ******* *** ***** has * **********, **** **** ****-**-*****:

** * ****** ***** system, ***** *** ********* so **** **** **** one ****** *** **** opens ****. ** **** explain *** **** ******* in *** ********* ********.

Master ****** *******

*********** * ****** *** is * ****** *** that *** **** **** locks. * ******* ****** keying ****** ********* *** plan *****.

**** **** ***** ****** of **** ********** ** roles/jobs **** **** ****** credentials ********* *** ******:

******** ** *** ****** and ******* **:

• ****** ****:***** *** **** ****** to ***** *** **** need ****** ** * single ****; ********'* *** offices, ****** ********, ***. These **** ********* **** only *** ****.
• ****** (** ***-******) ****:***** *** **** ****** to ********, **** *** able ** **** * range (*** *** ***) doors. *** *******, *** Engineering ******** ** **** to **** *** ********** engineering *******, *** ** on.
• ***** ****** ****:*** ***** ****** *** opens *** *****, ********** of ***** ***-****** ** patron **** *** **** in ***. *** *******, building *************** **** ***** keys ** **** ****** to *** **********.

** *** **** ** the ***** *****, *** will *** **** **** key ***** - ******, Master, *********** - ** shown **** * ********* bitted ***********, *** **** key ******* ** *** same "****** ****** ******". Master *** *********** **** often ****** **** *** other ***.

Master **** ********* *** *** **** ****

***** *** ****** ** a **** ******** ***, they *** ********* ******* controlled *** ******.

** **** *****, ****** keys *** *** **** be ********** **** ***** actually ******, *** **** destroyed ***** *** ** maintain ***** *******.

Same ******* *** ********* ****

*** ********** ** ******* alone ** *** * Master ****** ****** *****. Locks ** * ****** keyed ****** *** ***** to **** *** ********* key *** ************.

***** **** *** *** differently, **** *** *** the **** **** *******. Locks ** ***** ******* typically ****** ** **** in *** **** ****** Key ******. ** ***** this ******* ** ****** in ****** **** ****** *******: Restricted ************.

Losing ****** **** **** ****

*** ** *** ******* weaknesses ** * ****** key ****** ** * high-level ***, **** * Master, ***********, ** **** Great *********** *** ***** lost ** ******. ** that *******, **** ***** door ** ** ***** for ** *********** ** risk ** ***** ******, and *** **** '***' is ** ***** ***** door **** - *********** hundreds ** ***** *** many ********* ** ******* in ********* *** *** key ******** *****.

**** **** ****** ********** a ****** *** ****, the ******* *** ***** staggering - **** **** story ***** * ** college ******** **** *** ******* at **** ******* ******** dollars.

**** ********* ***** ******** not ******* ** ******* master **** ** *** despite *** ********* ***** available. ** **** ** one ** *** ******* advantages ** ********** ****** control, ***** ** * credential ** **** ** stolen, ** *** ** immediately ****** *** *** made ** ** ******* - ** ******* ***** or ****** ********.

Shear ***** **** ****** ****** ********

*** ********* ***** ***** how * **** ***** when ** **** *** a ****** '***** ****', or ***** *** ******* that ******* ** ** even ********** ******* **** halves.

*******, ******* ** ***** single **** ** ********* lengths, ****** **** ******* use **** **** ** of ******* ********* ****** (wafer *********). *** ***** below ***** ****, ***** a ****** '***' **** be ******** *********** ** 4 ** * *****, and ***** **** **** one ********* ***** **** is ******** ****** * pin *******:

*** ************ ** ******** shear ***** ** * pin ***** *** *********** of ******* ********* **** opening *** **** ****. In * ****** *** system, *** ***** *** built **** * ****** multiple ***** *****. *******, the **** **** *** them *** ******* **********. Therefore, *** ***** ******* the *** ** * common ***, *** **** common *** ** **** issued ** '****** ***'.

*** ***** ***** ** another **** ** *** concept, ***** ********* ** a ****:

*** *** ***** *****, the *** ******** *** open *** ****. **** key *** * ******* code ********.

*******, * *** ***************** **** **** **** lock, ** ***** * key *********, ** *** ***** subsequent ***** *********** **** matches * ***** **** up ** **** *** lock ****.

** ***** ******** ***** lines, **** **** **** no ******** *********** ** another *** *********** **** the **** ****. ** administratively ********* ******** ***** line ************ **** *** master/grandmaster ****, ****** ****** systems ** ********* ** locks *** ** *****, all *********** ******** **** a ****** ***.

Master ****** *****

*** **** ** ******** a ****** ****** ****** is ******* ******** ** a ***-****** ****** ****** and ***** ********* **** per **** **** ********** access.

** *******, **** *** tumbler ***** *** ** constructed ** ******* **** a ******, *** *** wafer **** *** ****** supply ***** *** **** locksmiths. ******* * **** for *** ** * master *** ****** ******** more ***** *** ** handling **** ****, *** usually ** *** **** more **** * *** dollars **** *** **** lock ** *******.

*** **** ********** ******* of ******** * ****** keying ****** ** ********** each ********** *** **** and **** ******* ****, however, **** **** ************* and **** ******** ************ will ** **** *** no **** **** ****** hardware. ********** *********-***** ******** can ** ********* *** less **** $***, *** even ******** ******** *** be **********, ******** ******* for **** ***** ** locks/keys *** ** *******.

*******, *** ******* **** in * ****** ****** system ** *** ********** management ** ****. ** order *** *** ****** to ****** ******, ***** time * *** ** issued ** ********* ** must ** **********. ***** most ***** ******* ******** shear *****, * ********* should ***** ** ***** to *** *** **** without ***** ******* *** those ***** ***** *** being ****, ** **** they *** ************* *** a ****** ** *********** key *** ****** ***.

****

*******, ***** *******,**** *** * ******** quiz.