Revers engineer master key

[milkman22]

Is it possible to reverse engineer a master key using the key cuts of 2 normal keys of the same key set

[Wizer]

No. I´m not a locksmith, but I think, that it´s not possible. But if you had two locks of the same master system....

[globallockytoo]

depends on the system. many master keys in use in USA seem to be built using the "deepest key method" (not the correct way to construct a system)

Yes it is possible, although unlikely with any great accuracy.

[raimundo]

you think that two individual keys from a master keyed system could be combined to produce a wild master, (one that shares common bitting from the system but is not the exact duplicate of the designed master key)

Thats about as likely as finding a renegade key from some other system and trying it to see if it fits some of the locks in your mastered system. You have a chance of success based on the number of extra shear lines introduced into the pin columns

That said, you should look a matt blazes site. google it.

[Tyler J. Thomas]

Is it possible to reverse engineer a master key using the key cuts of 2 normal keys of the same key set

Do you have the keyway or bittings? You can figure a lot out, even if you can't decipher the master key. You can tell if its a TPP or rotating constant system, which pins are progressed, and possibly even in what order.

[Jaakko]

http://www.crypto.com/masterkey.html

[mcm757207]

With depth and space information and a handful of key blanks you can reverse engineer all of the bittings that work in a given cylinder with just one working change key.

[magician59]

Is it possible to reverse engineer a master key using the key cuts of 2 normal keys of the same key set

I can,but I'm special that way.

[WOT]

Is it possible to reverse engineer a master key using the key cuts of 2 normal keys of the same key set

Two? No.

One + lots of patient + a lot of filing skills + a lot of these... then yes

[MacGnG1]

when i was a freshman in college, all the doors in the dorms were master keyed but only some of them opened all the doors to the different hallways while others only opened one door. thinking about it now, seems like they did a shitty job. but like was said earlier it's probably possible with lots of patience and a box of blanks.

[mcm757207]

Well you don't need a box of blanks, just six blanks (for a six pin lock).

[WOT]

Well you don't need a box of blanks, just six blanks (for a six pin lock).

If you ASSume that;

1.) No more than two cuts per chamber. Not always true. Common area, like laundry room, restroom, etc would likely have stacks with multiple master pins. (i.e. 1,3,5,7,9). In the presence of multiple stacks with multiple master pins, the number of blanks needed is increased.

2.) The yield is perfect with zero miscuts. Good luck on that on a combination of using files and little experience.

3.) That in a RC system with more possible combinations than the key system can provide, there is no false master pins in constant position to discourage the discovery of the constant bitting in that particular chamber. (even if the institutional lockie might not be smart enough, the software he used maybe able to do this)

[WOT]

Correction: should have read.

3.) That in a RC system with LESS possible combinations used and ever needed for further expansion the key system can provide, there is no false master pins in constant position to discourage the discovery of the constant bitting in that particular chamber. (even if the institutional lockie might not be smart enough, the software he used maybe able to do this)

when i was a freshman in college, all the doors in the dorms were master keyed but only some of them opened all the doors to the different hallways while others only opened one door. thinking about it now, seems like they did a "poopey in the worst way" job. but like was said earlier it's probably possible with lots of patience and a box of blanks.

Each system is different. Could be that there were independent key systems. Could be that they were separated using multiplex keyway system (i.e. same TMK, but different locations using different keyways)

Normal people call them G+nMK(grand master, great grand master, great great grand master, so on), MK, change key

Best Lock Corp call them GMK, MK, S+nMK (sub, sub-sub, sub-sub-sub, so on), operating key

A school district could put ALL its schools on the same top master key, have them be territorial, each bldg on separate key system. It all depends on whoever or whatever software designed the system.

[ElAbogado]

Is it possible to reverse engineer a master key using the key cuts of 2 normal keys of the same key set

It is possible to do that on a small masterkey system. If you have a code machine, a box of keyblanks, and access to a lock. Enough said.

[Tyler J. Thomas]

2.) The yield is perfect with zero miscuts. Good luck on that on a combination of using files and little experience.

Didn't you just give this guy crap about assuming and here you are assuming that he's doing this by hand and with a file when he hasn't indicated or hinted at anything of the sort? Code cutters, key punches, etc. all exist for a reason and writing those options off without any indication that would point to the contrary? That's a textbook "assumption" and quite frankly, it looks like you're just arguing to argue.

3.) That in a RC system with more possible combinations than the key system can provide, there is no false master pins in constant position to discourage the discovery of the constant bitting in that particular chamber. (even if the institutional lockie might not be smart enough, the software he used maybe able to do this)

False master pins? What locksmith on earth would use unneeded pins in an attempt to thwart deciphering? That would just result in more keys working the cylinder. You're out of your mind if you think adding additional master pins to thwart deciphering is anymore safe or helpful than adding extra keys that unintentionally will work it as well.