(532) Chinese Push Button Lock from Tjita1

[@stalthalion]

You sir have some of the very best quality in your videos. Not only your resolution. Your information is clear, and easy to understand. I have never picked a lock before, but I must say this looks like a up and coming new hobby for me. Thank you sir. subscribed!!

[@JasmineJu]

This is a true combination lock, unlike those other permutation locks.

[@geoffvincent2776]

I have had one of these locks for over 15 years and they have the advantage of not having to read the numbers once you know what buttons to press which is ideal in the dark or if your eye sight is suspect and mine has been outside for the last 5 years and works perfectly, Cheers

[@jasonfifi]

I had this lock as a kid! I used it with a cable as a bike lock all through college, and it didn't go missing until a particularly hurried move out of a house when I was 25. I really want to start looking for a few more.

[@lulamamsila2096]

I have been trying to crack this lock for the longest time having lost the combination. With your guidance I managed in no time . Thank you !! I'm so excited .

[@VMeGaMRedZV]

I had this lock when I was a little, one of the coolest lock I've ever seen but it's great to see this kind of lock in here.

[@rei-kunn5956]

Thank you so much! Recently, I tried using my lock and suddenly forgot the code 😅 so I tried not to panic so that my parents won't be bothered by my issue. I really can't thank you enough! Thank you so much!! ✨

[@uncle_thulhu]

I had several of those over the years on my high school locker. Super-easy to decode.

[@dsirgetas]

This was the actual code for my lock, that I was trying to remember... Thanks

[@dredd022578]

I have the same lock which has been sitting around and have forgotten the combination. I tried what you showed in the video for at least 10 times and it works. I just need to push the button sensitively. Thanks bosnianbill. :D

[@MrMartinSchou]

Brute forcing a lock like this is pretty easy as well. It has 8 pins, and needs 4 of them depressed, and the order of them doesn't matter. That gives us a combined total combinations of (8 x 7 x 6 x 5) / (4 x 3 x 2 x 1) = 1,680/24 = 70 combinations in total. Even if the lock didn't have the weakness exploited by Bill, 70 combinations can be done in a matter of minutes.

[@MrMartinSchou]

***** > The total number of states the lock can be in is actually 2^8 = 256. Which is complete irrelevant, because that includes states where fewer or more than 4 pins are activated at the same time, and those can't open the lock. The only relevant states are the ones that can open the lock, and there are only 70 of those.

[@MrMartinSchou]

***** If it can be opened with fewer or more than 4 pins it becomes more insecure. With 3 or 5 pins you only have 56 possible combinations. With 2 or 6 combinations you have 28 possible combinations. With 1 or 7 combinations you have 8 possible combinations, and with 0 or 8 there is only 1 combination. It is exceedingly unlikely that anyone who designs locks (even ones as crappy as this one) would ever pick a combination option with fewer than the optimal number of permutations. That'd be like assuming that when picking a tumbler lock, you should just ignore the number of pins you can feel, because they might not be used for anything.

[@MrCk0212]

Talking about brute force, using a small manual saw is much faster than trying all combinations.

[@kikilosabeyno]

Kong Tai Tsui But way more suspicious.

[@kye3794]

Kong Tai Tsui lol

[@slendy9600]

this design is pretty common over in australia... i remember my father showing me the same technique a couple years back. what baffles me is despite the clear flaw he's still using to secure something important (\_-

[@SightlessSenshi]

I had one of these in school. Since I'm blind, they figured it'd be the best bet to use on my locker, since I could feel it. But now I'm just glad I was never stolen from. That little thing is way too easy to pick!

[@razieljulz]

it's 28-Dec-2022 at the time of writing... cleaned up my old cabinet and i found my old padlock from years ago, a 10-button variant, i forgot the combination, was searching for possible solution to recover the combination and that's when i found this video, thank you so much for sharing this!

[@Sindini]

These style locks are super popular in Taiwan~ they cost less than $2 USD. I remember the first time I saw one on the shelf in a hardware store I had it open in about 2 min. You can decode these without even touching or putting pressure on the shackle. You can use a similar technique by just putting pressure on the actuator button.

[@Dislob]

I had a bike lock with numbers when i saw around 9-10 which i forgot the code one day. I figured out this technic of pulling the 2 parts apart and trying to align the holes with the pins. I managed to unlock it within 5 minutes. I was amazed at myself at first but then realised my bike lock was really shitty.

[@bussm09]

this lock was popular in high school. it is ashame that this was posted after i graduated. if i had seen this video in high school i could have do so many pranks

[@SteveFrenchWoodNStuff]

So the number sequence doesn't matter at all; as long as the correct 4 numbers are pressed it will work.

[@cofixit]

Wood 'n' Stuff w/ Steve French I think so. which is why there are only (8 choose 4) = 70 different combinations... :)

[@SteveFrenchWoodNStuff]

***** - Thank you.

[@antoy384]

Leon Kellerhals How do you calculate? 8x7x6x5 ?

[@Hazzza539]

Do a search for "mathematics combination". The number of ways of making groups of 4 from 8 items is expressed as 8C4 which is 70.

[@JasperJanssen]

The actual number of combinations that this lock can make physically is 256 (it’s just binary), but only 70 of those have 4 digits active and 4 not. If you allow 3 and 5 digit combinations as well it increases to 182.

[@miriamcq]

Can you change the combination of these locks??

[@jackrichards1863]

this is gold.there is invalids all across US with these locks securing the the lid of a keybox for EMS to access the home when the person has had a fall or the condition they have has knocked them out of action, the medical team are alerted by the patient alarm often a necklace pendant. and access is then given by the control team from the call centre via the keypad code. I'll be getting my aunt's locks changed & discuss the problem with her insurance

[@plug4uk696]

I actually had one of those locks, I think it was back in the 70's if memory serves me right ;-)

[@ivanmj1977]

How on gods name can I change the password

[@HingerlAlois]

Iván Montero Jiménez You can’t.

[@HardyElectro1M]

Can not be changed.

[@ivanmj1977]

@@HardyElectro1M dammm

[@Kiran______]

the code does not have to be in order. codes u can use are: 2457 2547 2754 2475 2745 7245 7254 2475 4572 5427 5472 7542 and a bunch of others.

[@ml-ws5bz]

no shit Sherlock

[@wszhou]

Kiran Ramlal Great.

[@PaulMurrayCanberra]

Kiran Ramlal 4! = 24 permutations. There's only 256 possible combinations anyway. With gray code you can zip right through them.

[@martinschuh3327]

+Paul Murray 256 if the code can have any length, otherwise without duplicates it's just 70 combinations.

[@CryptoBates]

+Martin Schuh where are these codes??

[@magnusmoty]

I know it's easily picked..... but..... it's beautiful!

[@azza1946]

Loving these videos dude they help me out A LOT. Keep them coming!

[@nathanvandevyver]

I have this lock too, I can't stop pushing the buttons. It's so addictive

[@renehenriksen1735]

Unbelievable that it can be done so easy..... :)

[@thenewmrs.7263]

that's a nice idea when I forgot the combination - which is now! thanks for this :)

[@kinnikuzero]

these remind me of my highschool days, they were everywhere

[@ItsSkyLOL]

But what do you do if you forget the code and need to use the lock again and it's unlocked. Can't lock it if combination is not pushed in. 😂

[@t_c5266]

stay safe stay legal. Great advice for sex

[@Halberdin]

Do not pick locks that belong to someone else. Do not pick a lock that you depend on, because your picking tool might get stuck or break. If the lock jams, use some lubricant, do not force entry. Vary tension force and attack angle while picking. 😀 (I have just started.)

[@dragonfireproductions790]

@@Halberdin that's what she said

[@JMLockpicking]

Nice one...kinda like those push buttons on doors, simplex locks.

[@LewisBrain]

jmmurdy we have them at work they do my head in.

[@Ken-S]

Oh god! I see so many people use this lock! Pick it don't even need a tool! LoL.

[@carzg6949]

But would it work the same if the code was not sequential? If for example the code was 7542 and you were trying to press each number in order, the first number you would press would be 2. Would it still plunge even though it is not the first number of the code?

[@FORRESTtheunoriginal]

+carz g doesnt really matter what sequence you push the pins in. think of it like those combination locks with the tumblers, you can start from the last one, and make your way to the first and it still opens.

[@jeffibbotson137]

+carz g any press sequence would probably work (5742, 4752 etc). This wouldn't be the case if it was an inline dial style. With the dial style, wheel 1 must always be turned to 7, wheel 2 to 5, 3 to 4 and 4 to 2. The lock wont care which wheel is set first as long as its end result is 7542

[@carzg6949]

+Locks and Keys Aha, I see now. I think in my head I was comparing it to a safe lock in which you would have to dial the combination in the correct order.

[@ziting5756]

+carz g I actually have one of this locks and yes it unlocks no matter what the order is. Honestly you can easily try out all possible combinations and it only took me like 10 mns

[@kyokazamaz2007]

Hi Can you show me a video how to rest new combination padlock please. I mean create my own personal combination

[@hey5837]

I was trying to unlock a lock that looks exactly the same, I tried the password shown at the beginning of the video, and it unlocked. IT UNLOCKED. BEFORE I ACTUALLY TRY TO FIGURE OUT THE PASSWORD. I didn’t know that this is how this video works. Anyway thanks for sharing. ❤

[@kimmiconcarne]

HOLY MOLY IT WORKED!! Thanks a lot!

[@MichalHalczuk]

This lock only has 255 combinations - 2^8 - 1 = 255. 2^8 because you have 8 pins, each can be either clicked in or not. -1 because the starting position is always everything unclicked. Even with picking-proof construction, this would only take couple minutes to get in if tried one by one.

[@bjmulli]

Nice one you learn something every day.

[@ChibiKeruchan]

haha my nephew has one of this.... I'm gonna impress his ass lol

[@bigboienfer4331]

uhhh gay

[@orangegreenn]

uhhh stupid

[@goyabee3200]

+efrain aranda More like illegal.

[@Theblackhawk90]

More like fuck it have fun

[@VasanthKumar-nu2px]

how do I change the combination?? please help me out...

[@LauraGonzalez-qb8fh]

Thanks for your help!!! I did it!! 🤓🤓🤓

[@pedropriego433]

how can i change th password

[@HingerlAlois]

pedro priego It’s not possible to change the password.

[@shotout74]

I had one of these, although it wasn't Chinese made I'm sure since this was back in the 80's when I was a kid. I remember him picking much the same way when I forgot the combination.

[@TheShroomhead99]

Hi im from Germany AMD im a Great Fan of lock lab especially bosnianbill! I startet picking myself because of your Channel. Great Skills man!

[@goyabee3200]

It kind of blows my mind to think that there's 1680* different ways to push in four of the buttons on that lock. *edit: actually only 70, I didn't realize that I had to divide that by the number of sequences which are just permutations of the same number sequence which is 4! = 24 so 1680 / 24 = 70.

[@goyabee3200]

privatenorby 8*7*6*5 = 1680 I think that is the right math, I couldn't figure out any other way to do it, anyway... At first I thought it was 8^4 = 4096 which is the number of different up-to-4 digit long sequences of 8 different digits and then I thought it was 8^4-8^3 = 3584 which is the number of 4 digit long sequences of 8 different digits but then I realized, as you said, that order does not matter, so I thought it's like a factorial but you stop after 4 multiplications except the actual number of multiplications you do is 8 modulo n where n is the length of the code so if the code length were 5 then it would be 8*7*6 = 336 and if the length is 7 then the number of possible codes would be 8 which makes sense because you run out of buttons. 8 modulo 4 happens to be 4 so that's the reason I only went 4 into 8!. If you're going to tell someone that they're wrong at least have the right answer. Jeez. So disappointing.

[@goyabee3200]

privatenorby It gets easier if you think of the number of ways to press only two buttons: you have 8 choices to start out with, and then after you press the first button you only have 7 left, right? So 8 different ways to push the first button and then no matter which button you pick for the first push, you will have 7 choices for the second push, so 8*7 = 56. 56 possible different way to push in only 2 buttons. It works the same way up until the number of buttons you've pushed in is greater than the number of buttons you have left.

[@goyabee3200]

+privatenorby Yeah, okay, I figured it out. It's 8*7*6*5 / 4! = 1680/24 = 70. I was way off.

[@rjelstyx4909]

+goyabee does this lock only uses 4 digits combination?

[@goyabee3200]

+Rjel Styx Yes, and that's for a reason. If the combination were more than four digits, the number of possible combinations goes down. For example 5 digits would have only 56 possible combinations. 7 digits, which is a lot more obvious, would have only 8 possible combinations, because once you've pushed in 7 of the buttons, there's only one button left, if you pushed in all 8 buttons, the only possible combination would be all buttons pushed in.

[@azzym312]

Is it necessary to click in sequence 2-4-5-7 or can you press in any sequence like 2-5-7-4 or 4-7-2-5. if there is a sequence then there are ( factorial8) combination (8x7x6x5x4x3x2x1) =40320. If sequence does not matter the 8x7x6x5 = 1680 only. combinations. It would not take long to try all.

[@trustnt1337]

Oh boy, this lock is famous at our school

[@micglou]

There aren't even a lot of combinations for these kinda locks... the order of the numbers doesn't even matter, that makes this lock easy to figure out even without putting tension on the shackle. You just need the 4 pins to be pushed in in no particular order, so even if you'd just tried it systematically you'd only spent a couple of minutes cracking it.

[@prof1811]

+micglou choose 8,4 = 70 combinations still....

[@oliverprendergast2049]

+Alex exactly, not a lot, basically 10 minutes at worst

[@NinjasKill123]

Does it work backwards? If you pressed 7 first would it show you one out of the four numbers, or does it only click the 2 if you press it first. Either way, it would still narrow the combos from 8! to 4! which is a world of difference.

[@LordBhorak]

+NinjasKill123 You don't have to use exactly 4 buttons, so that makes the amount of viable combinations up to 254 (So each pin represents a bit where unpushed is 0 and pushed is 1, so it makes 8 bits and 0000 0000 is not an option, naturally, and 1111 1111 would be silly as well).

[@DerMarkus1982]

I found out by "accident" how to "sense" the locking elements in a lock similar to this one in the mid-90s with my fingers. paused and wrote this *before* watching the video past 0:20... EDIT: this is 8 elements, i had a 10 elements one

[@NotHerb]

+Markus Preckl same here i was 8 years old

[@codydrumm5702]

My lock as 10 buttons and when I try to put the shackle it doesn’t budge but it will spring in closed a bit more. Also, the open switch at the bottom only goes half way and I supposed to move the release switch and then pull the shackle or keep the release switch in the closed position and pull the shackle?

[@frenky-tan]

I have this but my padlock already opened and don't know what is the number, how to reverse engineering to decode it?

[@TheMicrowarrior]

From that video, it looks like another way is to just put tension on the mechanism like in the video, but the buttons that need to be pressed have no clearance between the top of the button and the body while the others have at least a little.

[@bomin3286]

thank you so much I forgot my lock number I was able to find , thanks .

[@miguelitokatigbak3144]

Is it possible to change the lock number

[@muhammadkhalid7595]

How do I change the combination ?? Please help me out

[@therock4208]

How to reset this lock !?

[@isidoreaerys8745]

Does this work the same for the number locks on bathroom doors in office buildings?

[@naturetruth5218]

For better quality Zarker button lock made in Korea, it will be very difficult to trial as the opening lever will only work if the 5 numbers are correctly depressed. First press the opening lever. Then press button one by one. If one stuck, that's the button not inside the combination. Push it to normal after release the lever tension. Then press the lever again and continue with other buttons. Repeat until 5 numbers are left that can be depressed easily, that will be the magic number to open when you push the lever. Alternatively, depressed all buttons and try to push up button one by one. The one stuck is to be push up after release the lever tension. Then press the lever hard again and push other buttons up. Continue until left 5 numbers yet to push up, that will be the combination. There is no need to pull the shackle tight hard as many videos told.

[@jonasbalderas7864]

hi i would like to ask help,same lock from china but 10 numbers...i used your technique but why all numbers can be press down..pls help me.thnks

[@paulinemanda1878]

Thank you so much for helping me open my lock! 😁

[@strejiok]

Thanks! I have same lock and thought it can be broken but not picked :) You are awesome :)) Maybe you have more locks with numbers combination? would be greate to see how to open it...

[@rogerwilco2]

It still only has 256 combinations. On average it will take 128 tries to open it. Even less if it always needs 4 to numbers.

[@justinwood2]

RogerWilco 255 combinations.

[@kitsee]

justin wood you are both mistaken, there's only 70 combinations. the order doesn't matter and number cannot repeat so Combinations = n! / (n-r)!(r!) n = possible numbers, r = numbers used, so 8! / (8 - 4)!(4!) = 40320 / 24(24) = 40320 / 576 = 70 combinations. Edit: used a quick online tool to generate a list of possibilities: {a,b,c,d} {a,b,c,e} {a,b,c,f} {a,b,c,g} {a,b,c,h} {a,b,d,e} {a,b,d,f} {a,b,d,g} {a,b,d,h} {a,b,e,f} {a,b,e,g} {a,b,e,h} {a,b,f,g} {a,b,f,h} {a,b,g,h} {a,c,d,e} {a,c,d,f} {a,c,d,g} {a,c,d,h} {a,c,e,f} {a,c,e,g} {a,c,e,h} {a,c,f,g} {a,c,f,h} {a,c,g,h} {a,d,e,f} {a,d,e,g} {a,d,e,h} {a,d,f,g} {a,d,f,h} {a,d,g,h} {a,e,f,g} {a,e,f,h} {a,e,g,h} {a,f,g,h} {b,c,d,e} {b,c,d,f} {b,c,d,g} {b,c,d,h} {b,c,e,f} {b,c,e,g} {b,c,e,h} {b,c,f,g} {b,c,f,h} {b,c,g,h} {b,d,e,f} {b,d,e,g} {b,d,e,h} {b,d,f,g} {b,d,f,h} {b,d,g,h} {b,e,f,g} {b,e,f,h} {b,e,g,h} {b,f,g,h} {c,d,e,f} {c,d,e,g} {c,d,e,h} {c,d,f,g} {c,d,f,h} {c,d,g,h} {c,e,f,g} {c,e,f,h} {c,e,g,h} {c,f,g,h} {d,e,f,g} {d,e,f,h} {d,e,g,h} {d,f,g,h} {e,f,g,h}

[@jonathanlai49]

Kitsee you can use more/less than 4 numbers in this lock, (I've used it before, it can be changed), so the C does not work out, it is better off using 2^8 = 256

[@antonselivanov7873]

My reaction in Russian: офигеть! офигеть! :D

[@rune.theocracy]

Wait what if its not allowed to be randomized. Wont that be a problem?

[@Symbolic33]

Now i can steal some stuff from my classmate’s locker :v

[@umountable]

anyway, there are only 70 possible passwords. thats ridiculous ( binom(8,4) )

[@Atomsk102]

+umountable It looks like there are only 16 possible combinations. The combination must have one, and only one, button in each row. The rows are 1-5, 2-6, 3-7, 4-8. That means the possible combinations total 2^4, or 16. 1234 5234 1634 5634 1274 5274 1674 5674 1238 5238 1638 5638 1278 5278 1678 5678

[@samj8932]

+Atomsk102 wrong

[@umountable]

As i read in comments below any 8 bit number can be expressed, because there must nut be 4 set pins. Which results in 256 but which is still rediculously small

[@greeney1808]

+umountable there is 40320 You can search for any mathematical expression, using functions such as: sin, cos, sqrt, etc. You can find a complete list of functions here. Rad Deg x! Inv sin ln π cos log e tan √ Ans EXP xy ( ) % AC 7 8 9 ÷ 4 5 6 × 1 2 3 − 0 . = + not 70

[@umountable]

wtf? i am studying computer science, dont tell me how many numbers you can express with 8 bits xD

[@adrianborinsky2989]

Had one of the when I was young, you can just guess the combination, it doesnt take that much time

[@dancingpianofairy]

I have a 10 button one, and this trick doesn't work on it. :( All the numbers go all the way through instead of stop half way if they're wrong.

[@Kungfupanda839]

I just bought a 10 button one. I tried using this technique & all buttons can be pressed down 🤣

[@cyrusanonuevo2874]

thanks to your video the theft is so easy to steal the item in to the locker hahaha

[@pablogaviria3694]

Does it matter in which prder u push the buttons?

[@queensamanthanicolevolante3199]

It works thank you so much

[@mastorlie]

Will the same techniques work on a key safes used for door knobs?

[@Jackjack530]

Yes

[@sadakalodigitalmedia6969]

I don't remember my lock password, how can I fix the lock?

[@serinamisterina]

is it possible to change the given code to my own personal combination? it will be helpful if you could answer this.

[@BurntFaceMan]

best thing about this lock.. I've seen many of them. they all have the SAME BUTTON CONFIG. no jokes. how that for security lol

[@slash6132]

Wow very impressive.

[@Riseagainsttides666]

Just work for me! Thanks!

[@261Pro]

have you seen the new master lock 175? and can you please do a review on the bypass if possible? thank you

[@lareinedubois]

Can you say how to change the combination to a new one ?

[@sunithab.c9274]

U had helped me thank u so much

[@Alpharedtoe]

thanks bro, it works!

[@emanuelgallegos3447]

my dad found one of these but it has 10 buttoms and the combination is made of 5 numbers, that's 252 possible combinations, with a little of patience and a calculator I wrote the combinations in a word doc, and crossed out the wrong ones, it just took me around 70 tries that one in the video has far less combinations, 70 so it's easier to unlock

[@domjermano674]

So how to open when the lock arm is not in the hole but is locked ?

[@hsurichard5542]

Hi Tjita1, happened to have this kind of lock, but lost the instruction of how to reset the password, any idea of how to please, thanks.

[@pressdesign]

+Hsu Richard Send forgotten password via email.

[@pglb100]

Thankyouu for this video sir!! Awesome!

[@hanibalgebre4891]

I threw my 4 code thing , What should i do now????? help

[@PocoM-io4ru]

How to change the default code of this Lock please help

[@neurotica5461]

i tried it on mine and it didnt work my opening button is not a lever but a thing you push in

[@MOVTIVATION657]

thnks sir i solve my problem u great salute u\

[@Pionike]

How to change the lock numbers?

[@Sportszone7043]

How can change the password

[@nereus2953]

Thanks Bill

[@ahmedjoy2357]

Is there any way to change pass?

[@christopherellis2663]

I have had one like this for over a decade.

[@GxAxV]

Just as one of these locks lands in my hands, the man himself has a video on it! yet my one is different and can't seem to open in this way. The switch on the bottom of mine is sprung loaded. I dont have the code and am locked out. I also tried with the peterson knife tool to feel "ledges" on the right buttons but it just goes right through all of them =[

[@GxAxV]

I got it in the end but half in this way and half process of elimination =[ It took me long enough as i discovered it was a 5 digit code and not 4.

[@Nanoyamicas]

Great Ved, loved this intro too

[@sahibkhan4384]

how to change the password of this lock

[@DatCupcake]

There are only 36 combinations to this lock...might as well just use a cable tie.

[@heavythinker16]

+frechieguy I have the same lock from so many years ago and I listed down all the possible combinations, was able to crack it!

[@Bunny99s]

+frechieguy 36? Where do you get that number from? If there's always exactly 4 numbers pressed you get 70 combinations. So it's (8! / 4!) / 4! == 70 see this page: mathcentral.uregina.ca/QQ/database/QQ.09.07/h/heidi1.html If any combination is allowed there are 2^8 == 256 combinations. Of course you want to take out all 0 or all 1 since that's too obvious ^^. 8Bit security ^^ If it was a password in a computer it would only take a tiny tiny fraction of a second to try all combinations :D

[@DatCupcake]

Bunny83 The order of the numbers is irrelevant. For instance, 8264 would be the exact same combination as 4682 or 6428. That's why there are so few combinations.

[@Bunny99s]

+frechieguy Yes, of course the order doesn't matter, that's why there are only 70 combinations with 4 out of 8. If the order would matter (which is impossible for that lock design) there would be 1680 (== 8! / 4! or == 8*7*6*5). However since the order is irrelevant the possible combinations (given any number count) is 256 since it's basically like a single 8 bit number. You simply have 8 switches which can be either "on" or "off". I never had a lock like that but as Jonathan LAI said in a comment below it is possible to set any combination as password, so there are in fact 256 combinations. It's only 70 if the password length is 4 numbers. With 4 numbers there are 24 (4!) permutations possible. Since the order doesn't matter we simply have to divide the possible combinations of 1680 by 24. That gives us 70. So for a 4 number password there are 70 possibilities

[@ayaali6757]

this one work :P facebook.com/1137611209591990/photos/a.1137622039590907.1073741828.1137611209591990/1137622009590910/?type=3&pidid=6bd7c006-33a4-4e57-ab0d-99423c16fc3f (532) Chinese Push Button Lock from Tjita1

[@wilber8965]

nice ending!