Hi, my name is Tyler and I am going to show you how to make and use a bump key. A bump key when properly used will open any lock that it fits into. Now, this technique is not new. The bad guys have been using it literally for years and the locks that you buy today, yes even lock that you have on your front door is vulnerable to this technique, largely because the general public doesn't know that they are unsafe.
The way a normal key works is; you stick it into a lock and if you look at a key, you'll see that it has little ridges and little valleys. When you stick it into a lock, the little valleys line up with the pins inside the lock. Those pins have splits in them at various heights and if the height of these little valleys matches the correct height on the pins, then the splits in the pins will line up where the two parts of the lock meet, allowing the cylinder to turn.
Now, the way a bump key works is, the valleys are cut all the way down to the lowest setting and it still has little ridges and you stick it partly into the lock and give it a whack. When you fit it, these little ridges here will transmit their energy up to the pins and just like a set of billiard balls, you hit the first one and the last one jumps in the same way you hit these pins, you hit the very bottom one and the top one is the one that pass up. Now if you turn your lock to lock right at the right time, that little area between where the two parts of lock meet, where the cylinder meets the outside of the lock will be free so the cylinder will freely turn allowing you to open the lock.
Now the way you make this, is you take just a normal key. This particular key went to an apartment that I no longer live in, so I am not going to use the key for anything else. However, this key does fit into the lock I have on my front door. So you take this key. What I did is I took a little pen and mark below where each one of these little valleys is, each one of these little flat areas, I mark on this little ledge right here on the bottom where that was so that when I was cutting, I would know where the pin was, so that I would know where to cut little valley to. Once you have removed quite a bit of metal there, it can get a bit confusing if you don't have any reference.
So mark on that mark on that little ledge, on the bottom of the key where each of these little valleys is and then take -- with a file, I've got this file for $2 at Home Depot. I actually got a set of three because I didn't know which one I would use. But this little triangular shaped file worked great. You take the file and file it down, the metal all the way down to that little ledge, that's the lowest setting where our keys will be normal be set. Go get the key out of the way when you are trying to turn it. So you file this all the way down. This part right here takes about a half hour.
Alright, so here's the finished key. It doesn't look wonderful, but it works. You will notice that it's cut all the way down here where each one of those five pins was, there's now, it's all cut, all the way down to this very bottom ledge. Between each one of those little valleys, you will notice just a little tiny peak, just little tiny triangles. Important things about these little triangles here is the slope of these little triangles has to be such that, when you stick it into the lock of the pins can easily slide over to front of the lock, the front of these little triangles and when you pull it out of the lock, the pins will easily slide back out. If it's too steep on this side, when you try to stick it in, it won't go in, if it's too steep on the other side, it will go in just fine, but when you try to pull it out, it won't come back out. That will be real tough to try to explain to the locksmith what you were doing. So be real careful and let's go try this out.
The first time you do this, I recommend that you let the door open, that way in case the key does get stuck in the lock, you are able to still get into your house and you are able to take the lock apart. Take the key, put it all the way into the lock, pull it out one notch, one little click. Door is locked, put a little bit of pressure on the key, you know, if you have ever picked locks before, you know how much I am talking about. Just enough so, that when the pins jump out of place the cylinder will turn and It will catch. Little bit of pressure and give it a tap. I am going to use the back of the file that I used to cut the key. It doesn't work for it, I'll try it again. There you go. One more time. Pull it out one notch, little bit of pressure. Alright, one more time just for fun. Key all the way in, pull it out, little bit, little bit of pressure, there you go and it locked, I will show you that again. Take the key all the way in, at one click, little bit of pressure. If it doesn't work within first few tries, you're probably doing something wrong. There you go.
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