#1 May 10, 2008 12:48 AM

Spector

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From: ISS

Registered: May 09, 2008

Posts: 123

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HOw to crack a Master Lock

MasterLockSmith 1.0a3 algorithm translation
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FINDING THE LAST NUMBER
On older Master Locks, ones where the arrow at the top is raised, simply pull on the shackle and turn the dial until it catches, that's the third number in the combination.
On new locks with the recessed arrow, there are twelve places the dial will catch if you turn it while pulling on the shackle. Seven of these will catch between two numbers, ignore these, and find the the five that catch on a number. Four of these will end in the same digit, i.e, 1, 11, 21, and 31.  The fifth ends with a different digit, and is the third number in the combination.
FINDING THE FIRST & SECOND NUMBER
Using the last number, locate it in the "last number chart" below to see which table to use to find the possible first and second numbers.  Try each of the number combinations until the lock opens. Example: If the last number is 31 then you must use Table C according to the chart. That means you must try the following combinations:
•    3 - 1 - 31
•    3 - 5 - 31
•    3 - 9 - 31
•    etc.
•    3 - 37 - 31
•    7 - 1 - 31
•    7 - 5 - 31
•    7 - 9 - 31
•    etc.
•    7 - 37 - 31
•    11 - 1 - 31
•    11 - 5 - 31
•    11 - 9 - 31
•    etc.
•    39 - 37 - 31
LAST NUMBER CHART
TABLE    LAST NUMBER
A    1 5 9 13 17 21 25 29 33 37 41 45 49 53 57
B    2 6 10 14 18 22 26 30 34 38 42 46 50 54 58
C    3 7 11 15 19 23 27 31 35 39 43 47 51 55 59
D    4 8 12 16 20 24 28 32 36 0
TABLES
TABLE A     TABLE B    TABLE C    TABLE D
FIRST #    SECOND #    FIRST #    SECOND #    FIRST#    SECOND #    FIRST #    SECOND #
1       3       2       4       3       1       4       2
5       7       6       8       7       5       8       6
9       11       10       12       11       9       12       10
13       15       14       16       15       13       16       14
17       19       18       20       19       17       20       18
21       23       22       24       23       21       24       22
25       27       26       28       27       25       28       26
29       31       30       32       31       29       32       30
33       35       34       36       35       33       36       34   
37       39       38       0       39       37       0       38
For those who care...
Derived Formula:
•    input "Enter Last Number :", LastNumber
•    FirstNumber = LastNumber MOD 4 + abs(LastNumber MOD 4 = 0) * 4
•    SecondNumber = (LastNumber + 2) MOD 4 + abs((LastNumber + 2) MOD 4) * 4 for i = 0 to 36 step 4
•    print (FirstNumber+i)*abs(FirstNumber+i<40),(SecondNumber+i)*abs(SecondNumber+i<40)
•    next

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Be Revolutionary, Be Linux

Zekira Drake

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From: MASTER SPARK

Registered: Jun 08, 2006

Posts: 2,060

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Re: HOw to crack a Master Lock

Hacking for the win.

Of course you're not the only one who knows this ^^ It's just that no one here in our country uses Master Locks much so I don't get to apply it as quick as I can.

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Spector

Member

From: ISS

Registered: May 09, 2008

Posts: 123

Gems: 0

Website

Re: HOw to crack a Master Lock

thanks fellow hacker
I will try to post more related stuff later

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Be Revolutionary, Be Linux