Tài liệu Ted The Tool - MIT Guide to Lock Picking docx

Thus, the pro cedure for one pin at a time picking a lock is to apply a sheer force, nd the pin whichisbinding the most,and push itup.. In order to understand the "feel" of lock picking

Ted the To ol

Septemb er 1, 1991

Copyright 1987,1991 Theo dore T.Tool All rightsreserved.

Permission to repro duce this do cument on a non-pro t basis is granted provided that

this copyrightand distribution notice is included in full The information in this bo oklet is

providedfor educational purposes only

August 1991 revision

1 It's Easy 4

8.1 Exercise 1: Bouncing the pick : : : : : : : : : : : : : : : : : : : : : : : : : : 23

8.2 Exercise 2: Picking pressure : : : : : : : : : : : : : : : : : : : : : : : : : : : 24

8.3 Exercise 3: Picking Torque : : : : : : : : : : : : : : : : : : : : : : : : : : : : 24

8.4 Exercise 4: Identifying Set Pins : : : : : : : : : : : : : : : : : : : : : : : : : 25

8.5 Exercise 5: Projection : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 25

9.7 PinDiameter : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 32

9.8 BeveledHolesand Rounded pins : : : : : : : : : : : : : : : : : : : : : : : : 32

9.9 Mushro om DriverPins : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 34

A.1 Pick Shap es : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 43

A.2 Streetcleaner bristles : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 44

A.3 Bicyclesp okes : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 46

A.4 Brick Strap : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : : 47

It's Easy

The big secretof lo ck pickingis that it'seasy Anyone can learn how topick lo cks

The theory of lo ck picking is the theory of exploiting mechanical defects There are a

fewbasic concepts and de nitions butthe bulk ofthe material consistsof tricksfor op ening

lo ckswith particulardefects orcharacteristics Theorganizationof this manual this

structure The rst few chapters present the vo cabulary and basic information ab out lo cks

and lo ck picking There is no wa to learn lo ck pickingwithout practicing, so one chapter

presentsaset ofcarefully chosenexercises thatwill helpyoulearn the skillsof lockpicking

The do cument ends with a catalog of the mechanical traits and defects found in locks and

thetechniquesusedtorecognizeandexploitthem The rstapp endixdescrib eshowtomake

lo ckpicking tools The other app endix presentssome of the legal issues of lo ckpicking

The exercises are imp ortant The only way to learn how to recognize and exploit the

defects in a lo ck isto practice This meanspracticing many times onthe same lo ck aswell

aspracticing onmanydierentlocks Anyone can learnhowtoopendeskand lingcabinet

lo cks, but the ability to op en most lo cks in under thirty seconds is a skill that requires

practice

Before getting into the details of locks and picking, it is worth pointing out that lock

picking isjust one way to bypass a lo ck,though it do escause less damagethan brute force

techniques In fact,it maybeeasier to bypassthe b oltmechanismthan to bypassthe lo ck

It mayalso b e easier to bypasssome other part of the do oror evenavoid the do orentirely

Remember: There isalways anotherway, usually a b etter one

How a Key Opens a Lock

Thischapterpresentsthebasicworkingsofpintumblerlo cks,andthevocabularyusedinthe

rest ofthis bo oklet Theterms used todescrib elocksand lockparts varyfrommanufacture

to manufacture and from city to city, soeven if youalready understand the basic workings

of locks, youshould lo ok at gure 2.1 for the vo cabulary

Knowing how a lock works when it is op ened by a keyis only part of what youneed to

know You also need to know how a lo ck resp onds to picking Chapters 3 and 5 present

mo dels which will help youunderstanda lock's resp onseto picking

Figure 2.1 intro duces the vocabulary of real locks The key is inserted into the keyway

of the plug The protrusions on the side of the keywa are called wards Wards restrictthe

setof keysthat can be insertedintothe plug The plugis acylinder whichcan rotatewhen

the proper key is fully inserted The non-rotating part of the lo ck is called the hull The

rstpin touchedbythekeyis calledpinone Theremaining pinsare numberedincreasingly

toward the rear of the lo ck

The prop er key lifts each pin pair until the gap b etween the key pin and the driver pin

reaches the sheer line When all the pins are in this p osition, the plug can rotate and the

lo ck can be opened An incorrect key will leave some of the pins protruding between the

hull and the plug, and these pins will preventthe plug fromrotating

The Flatland Model

In order to b ecome go o d at picking lo cks, you will need a detailed understanding of how

lo cks works and what happ ens as it is picked This document uses two mo dels to help you

understandthe b ehavioroflocks This chapterpresentsamo del thathighlightsinteractions

b etween pin positions Chapter 4 uses this mo del to explain how picking works Chapter 9

will use this mo del to explaincomplicated mechanicaldefects

The mo del of a lock is shown in Figure 3.1 This is not a cross section of a

real lo ck It is a cross section of a very simple kind of lo ck The purposeof this lock is to

keeptwo platesof metal fromsliding overeach other unless the properkey is present The

lo ck is constructed by placing the two plates over each other and drilling holes which pass

through both plates The gure shows a two hole lock Two pins are placed in each hole

such that the gap b etween the pins does not line up with the gap b etween the plates The

b ottom pin iscalled the key pin b ecause ittouchesthe key The top pin is calledthe driver

pin Often the driver and key pins are just called the driver and the pin A protrusion on

the underside of the b ottom plate keeps the pins from falling out, and a spring abo e the

top plate pushes down on the driver pin

If the key is absent,the plates cannot slide o er eachother becausethe driverpins pass

through b oth plates The correct key lifts the pin pairs to align the gap b etween the pins

with the gap b etween the plates See Figure3.3 That is, the key lifts the key pin untilits

top reachesthe lock's sheer line In this con guration, the platescan slide past eachother

Figure 3.3 also illustrates one of the important features of real lo cks There is always a

sliding allowance That is, any parts which slide past each other must b e separated by a

gap The gap b etween the top and b ottom plates allows a range of keys to op en the lo ck

Notice that the rightkey pin in Figure3.3 is not raised ashigh asthe leftpin, yetthe lock

will still op en

Figure3.2: (a) Flatland key raises pins

Basic Picking & The Binding Defect

The modelhighlightsthe basicdefectthat enableslo ckpickingtowork Thisdefect

makesit p ossibletoop en alo ckbylifting the pins oneata time,and thusyoudon't needa

key tolift allthe pins atthe same time Figure 4.3 showshowthe pins of a lo ckcan b e set

oneatatime The ngersyouuse isamatterofpersonalchoice

Anotherwaytoholdthe pickislikeholdingap encil Withthis metho d,yourwristprovides

thepressure Ifyourwristisprovidingthepressure,yourshoulderand elb owshouldprovide

the force tomovethe pick inand out of the lo ck Do not use your wrist to b oth move the

pickand apply pressure

A go odwa toget used tothefeel ofthe pickb ouncingupand down inthekeywa isto

try scrubbing over the pins of an op en lo ck The pins cannot b e pushed down, so the pick

picking toolopens the lo ck Tothem the torque wrench is a passive to olthat justputs the

lo ck under the desired stress Let me prop ose another... be insertedintothe plug The plugis acylinder whichcan rotatewhen

the proper key is fully inserted The non-rotating part of the lo ck is called the hull The

rstpin touchedbythekeyis... eshowtomake

lo ckpicking tools The other app endix presentssome of the legal issues of lo ckpicking

The exercises are imp ortant The only way to learn how to recognize and exploit the