Next, there will be a series of articles to sort out what I learned in the process of tossing, from outside to inside, from small to large. This is the first one-fingerprint lock.
It is said that this fingerprint lock is not a high-tech thing, and it has a history of more than ten years. The principle is also very simple: fingerprint identification-if it passes, it will give a signal to the motor-the motor rotates to directly rotate the lock body or make the handle match the square shaft-press the handle to open the door.
Then why didn't fingerprint lock come into public view until recent years? Because the fingerprint algorithm technology didn't mature until a few years ago, the false recognition rate, false rejection rate, service life and so on all reached the usable level. More importantly, with the improvement of people's consumption level, the demand for comfort is also increasing day by day. Fingerprint locks have a large enough market for many manufacturers to enter, and the sales volume is increased and the cost is reduced.
However, like all markets, this market also makes money by information asymmetry. The price of fingerprint locks on the market ranges from hundreds to thousands or even tens of thousands, and the shapes are also strange, and the functions of publicity are varied. So about the fingerprint lock, is it really what you remember?
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Let's get started.
The answer is: fingerprint unlocking is safe, but changing the fingerprint lock will not improve the security of your home, and may even reduce it.
One of the favorite words of fingerprint lock sales staff is that there are no two identical fingerprints in the world; The probability of hitting a fingerprint is one in five billion. This sentence is true, but strictly speaking, there are no two identical keys in the world, are there? Then why are there still many keys to open the same lock?
Imitate Zhihu's famous saying: Talking about the uniqueness of fingerprints without recognition accuracy is hooliganism. If an 800-degree myopia is allowed to identify, everyone's fingerprints are similar: aren't they all round?
Of course, as far as fingerprint identification technology is concerned, this is no longer a problem: no matter how bad the identification accuracy is, it is extremely difficult to meet a thief, but the similarity with your fingerprint is over 80%. Even if the recognition rate is as high as 1%, no thief will stand in front of your door and brush his fingers a hundred times. In fact, compared with the following question, the fingerprint part confirmation of fingerprint lock can be considered as impregnable.
Because the state stipulates that all electronic locks must be equipped with emergency unlocking devices, most fingerprint locks are equipped with physical keys and lock cores for emergency unlocking. This part has nothing to do with the electronic part. Even if there is no electricity or even the circuit is damaged, the emergency key can open the lock tongue. According to Kanekin's law, the highest safety limit of fingerprint lock is to what extent the lock core can prevent theft. But the problem is that when our users buy fingerprint locks, they often pay too much attention to the function of fingerprint identification, and don't pay too much attention to what lock core to use, which leads to manufacturers often not working hard on it. I've seen it. It even applies to Class A locks. That's something that even I can poke with two paper clips.
You have to understand that no matter how naked your lock body is, there are eighteen folds underground. When you twist the key, the whole security door can't wait for octopus to hook on the wall. For the gentleman on the beam, what they have to deal with is actually just your lock core. It's the following little thing:
The so-called A-class B-class C-class lock only refers to this thing and has nothing to do with your lock body. No one will bring a chainsaw to hum your lock. Disturbing the people, where did he get the power?
So as long as the fingerprint lock uses a good lock core, it can at least reach the safety level of ordinary security doors?
Not exactly. There is also the difference between true and false ferrules.
True mortise means that the lock core passes through the lock body like a traditional security door, as shown in the following figure:
Generally, the false ferrule puts the lock hole at the bottom of the front panel, and the lock core is placed vertically on the front panel without passing through the lock body.
The main differences between the two are:
For the real ferrule, even if the fingerprint part is completely destroyed or doesn't work, the thief still has to face the lock core. Class b and class c should still have anti-theft function. For the dummy ferrule, as long as the front panel is pried open, the lock core is completely useless, and the door can be opened with pliers.
So you see some fingerprint locks with exaggerated prices, not only using fake card sets, but also using A-class locks and plastic plates, so you can smile at the salesmen who are trying to sell you, and then turn around and leave. For a thief, using this lock is just like what the Japanese military said, "Russian warships are moored in the harbor, attracting our navy to attack."
Actually, there is not much difference. Fingerprint locks are like many other so-called smart things. Basically, they are the same people who used to make traditional locks. They have the skills of making hardware, the experience of making locks, and the sales channels. What they lack is only the scheme. Instead of letting solution companies learn how to make locks, it is better to sell them solutions. However, there are not many solution companies that independently research and develop this product, and all kinds of lock factories buy solutions from similar solution companies. The locks made naturally have similar functions, and the difference is nothing more than appearance and technology. I did do something fancy in fingerprint identification or function, at least I haven't seen it yet.
This seems nonsense, but in fact, many foreign electronic locks only have password function, but no fingerprint function.
Very safe and convenient. Besides cards, this is a safer and faster way to unlock than fingerprints.
Most of them are 8- 12-bit passwords, which can interfere before and after and prevent peeping. Just enter a string of numbers and the password you set.
This is actually a trivial function, especially under the premise of unlocking the password. And personally, it is a practice that will lead to a decline in security. Haier demonstrated at a conference that fingerprint locks can be cracked remotely by technical means. So Haier's fingerprint lock can only be controlled in one direction.
Usually, it can save hundreds of entries and users, which is a good function when many people use the same lock.
If it is not locked, it is natural to lock it. At present, most locks are still in the realm of lifting doors. In fact, this difficulty is not great. Many companies have realized the automatic locking of the car door, but the main problem is that the automatic locking conflicts with the pole. With the increase of service time, the car door will sink, resulting in the failure of the automatic locking function. Especially wooden doors or iron gates, this problem will be more serious.
Simply put, after locking, the handle can move up and down freely instead of being locked. Actually, I haven't seen the fingerprint lock door handle locked after locking the door. It is not clear why the store will use this as a publicity point.
Basically, it has this function, and the difference is nothing more than micro usb charging or a 9V battery. Inconvenient. Few people bring this kind of thing. But relatively speaking, you are more likely to knock on your neighbor's door and borrow a charging treasure and a charging cable.
It is worth mentioning that one manufacturer has played a unique role in this respect. They directly put the small battery with long standby time on the front panel and push it directly when necessary to provide enough power for the system to complete an identification. This is the most elegant solution at present, which is worth popularizing. Although this feature may only be encountered once every few years, people often take this into account when purchasing.
This is the mechanical key that we discussed for a long time above. Generally speaking, fingerprint locks are not equipped with decorative keys, because you only need to change the password or delete the fingerprint. For this thing, what you need to do is not to leave all the emergency keys at home.
This is bullshit. A lock rarely has only one key, and fingerprint locks are not allowed to be opened with only one finger. At present, most fingerprint locks are enough to provide hundreds of fingerprints, so don't worry.
This function is inconspicuous, but it is necessary. Because the terrible thing is that the authority of the master, children, guests and nannies is the same.
It is to add a button to the handle inside and press this button at the same time to turn the handle to open the door. Put an end to the theft of putting the wire through the cat's eye and pressing the inner handle to unlock it.
Basically there is. It should be noted that a new lock must be reset before it can be used. Who knows if there are any other fingerprints or passwords in it to unlock the lock?
Small functions, low battery alarm, anti-pick alarm, false door closing alarm, lock body automatically locks after repeated testing, not to mention one by one.
This thing is not popular yet. It probably means not only to check whether the fingerprints match, but also to check the temperature, humidity, blood flow speed and so on of the fingers. It is of little significance to the civilian level.
As mentioned above, some fingerprint heads are easily broken. In order to prevent the fingerprint lock from becoming a traditional lock instantly after the fingerprint head is broken, most manufacturers also provide card-type and combination unlocking methods. You can choose this according to your hobbies, but you must have it.
Automatic locking is the most suitable way for lazy people, but not every fingerprint lock has this function for various reasons. If you care about this, you must see it clearly.
Whether it has the function of heaven and earth pole, whether it is suitable for your lock body, whether the thickness of the door is up to standard, whether the door is opened left or right, and so on. Responsible sales will ask these questions clearly. (in fact, irresponsible sales will also ask, after all, it is his business to pretend or not. )
Many manufacturers, especially online manufacturers, often find local locksmiths to help you lock. If something goes wrong at this time, maintenance and replacement will be very troublesome. The characteristic of the lock is that if there is a problem, you are absolutely afraid to go out. It is very important to respond in time and deal with it quickly.
A few years later, if you change to a big house or live in another city, can you take away the lock you bought for thousands of dollars? Some locks can't change the way to open the door left and right, which will greatly limit your choice when replacing them. In this respect, Samsung is very smart, and directly chose the push-pull handle, regardless of the left and right.
Most locks are made of zinc alloy. This material has certain strength, light weight and low price, so it is very popular among lock factories. Of course, stainless steel is better, but the resulting cost increase is not everyone's pleasure. There is nothing to say and nothing to choose from in this part.
It should be noted that we talked about the front panel before. Different from traditional locks, the front panel is an ornament, which is the lifeline of most fingerprint locks, especially those with fake mortises. As long as it is broken, the rest is Ma Pingchuan. Make sure that the front panel can resist basic violent disassembly.
As for the inner panel, there are different opinions about whether it can prevent cat's eye, so I took the initiative to cancel this function because I really don't want to press the button with my thumb every time I open the door.
This aspect is purely subjective and I won't go into details. I know some friends are very concerned about this, but this is a matter of opinion. It is recommended to go offline to experience before buying. After all, this is what your guests see at first sight and you will use it for a long time. If you buy a style you don't like, it's like cutting a bad hairstyle and not changing it for ten years.
Of course, most fingerprint locks don't need a special door, and you can buy them at any time. People who are not in a hurry can wait for products with better functions and stronger brands to appear.
For me, I can finally live this life. I don't have to repeatedly confirm that I have a key before going out every day.