07 - How Masterkeying Works

[DouglasZwick]

I've watched a hundred LPL videos or so, and I keep hearing about master wafers this and masterkeying that, and their impact on pick resistance and stuff, and this video explained it all PERFECTLY. Thank you so much for such a good video!

[devinpallone]

This was an excellent video. Everything you said was relevant, you went over a few different scenarios, you didn't give a long winded intro, and most importantly: It was short

[invictusdomini]

Security can be attained again by drilling one or more construction key taps into the bolt and then substituting the corresponding driver pins with shortened T-pins and accompanying thin wafers. Won't change the master keying but it will very likely seize the bolt mid turn when a pick is attempted (the more T-pins, the higher the chance of seizure).

[TraceguyRune]

I knew it. I came to the conclusion the other day that in order to have master keys, the lock has to be easier to crack, thus becoming a security flaw.

[fangboy]

I love how these videos are short and to the point

[DuyNguyen-lomm]

I couldn't wrap my head around how master key work before. Thank you

[Pbirinus]

This is a really clear explanation. Thankyou

[OperationAcidGambit]

I like this. I don’t click videos that barely get just over the 10 min mark for ads and profit.

[waylonk]

A fantastic video that answers an age old mystery

[artdogor]

Thank you Schuyler! This is a very easy to follow explanation, I'm impressed you even compressed the springs. Your whole series is great. Really like how you cover one aspect at a time. It's easy to watch one whenever you have a few extra minutes. Hope we can expect more.

[miguelash]

I once visited a friend in Germany while he was studying. In his apartment he could get from the front door of the building all the way into his own room with the same key. So all the students could get into the building with their own keys, but only to their own apartment. Then again, they could get into their own room with the same key but not into their roommates’. One key, three locks. How does this mechanism work? My guess at the time was that some of the pins where used for the main entrance, some for the apartment’s door and some for the bedroom so all the keys should share the same profile in one section and for the same apartment, those keys share another section and the third section would be different to open only their own room (I never got to see another key). But maybe it used something like what’s depicted in the video.

[yeezuschrist]

I had no idea that masterkeying weakens locks. That’s pretty cool, thanks for the good vid

[christianwoodley]

You explained this so well and got straight to the point. Thank you!

[NetRolllerD]

Not only that, but it's very easy for the holder of a regular key to discover the master key. Whereas a lock with N pins and K depths can have K^N (K to the Nth power) different possible keys, only (K-1)*N keys need to be tried to discover the master bitting - a much lower number.

[binaryglitch]

Due to the fact that my landlord only used the two most obvious sheer lines and the fact that our building has locking shared bathrooms, I was able to reverse engineer a working masterkey on my first attempt. Good thing I don't have 31 bathroom keys and 1 masterkey. My landlord was too upset to be impressed but the maintenance man wanted info on how to make this harder. I told him he could very the use of the sheer line and at the expense of adding more sheer lines, he could use 3 pins occasionally or move to 6 pin locks or higher to complicate reverse engineering. Also have cameras on the unit and bathroom doors... I wouldn't be able to temporarily replace locks so that I can inspect the originals without being noticed as easily. Hopefully our building will be more secure now...

[joecaljapan]

thank you for such a clear and simple explanation of this!

[chozo]

It certainly does lessen the security. but it can also bump up safety. My father is a firefighter and they use master keys often in emergency situations to gain entry in to a building

[myrddinb]

And that explanation at the end is why you can also have such things as say master key for say a specific building, a grand master key for all the buildings in a complex, and a great grand master key for all your complexes. It goes up to even great great grand master key level.

[Antexjerr]

I own a rental property and I was trying to re-key it with a master key this video helped explain it to me thank you. I enjoyed every video of yours I have watched.

[themessiah..]

I remember when i was 7 one of the maintenance men left their key in the lock as when they did maintenance on our neighbors place so i yoibked it before they noticed and at the time i never thought about it but nothing happened it worked because i tested it at our door never used it other than that but they never changed locks or alerted anyone so they basically endangered the entire complex