Card secret
Less and less money on the body
More and more cards in the bag
In the era of card rampage
What do we really understand?
"Science and Education Watch" reveals the secrets of various cards
Cao Difei: Hello everyone, I am Cao Difei.
Yu Qiu: I am Yu Qiu.
Cao Difei: Yu Qiu, your wallet is quite small.
Yu Qiu: Small and not practical.
Cao Difei: How much money can't fit?
Yu Qiu: What, now, in people's wallets, there is not much money, and all kinds of cards are a lot.
Cao Difei: This is a sign of the rich.
Yu Qiu: Do rich people use so many cards? You see, what are the bus cards, transportation cards, discount cards, entrance cards, meal cards, electric cards, right, and ID cards, all of which are used for life.
Cao Difei: It’s really tiring to live now, and it’s hard to walk without a card.
Yu Qiu: In fact, there are a lot of attention in these cards.
Cao Difei: What is simple, what is safe, what should be paid attention to when using
Yu Qiu: Let's talk about it in detail in this issue.
Trailer:
Open our wallet and you will find that all kinds of cards really have to be wallet. Look over and see which ones can be eliminated, bank cards can not, the meal card of the canteen is also needed, the bus card, the company's door card, phone card can not be lost. It seems that our life is really inseparable from these colorful cards. These cards have similar surfaces, but they are actually far away. Some have magnetic strips on the back, some have chips on the surface, and there are nothing in the light, some are thin and thick, some are big and small, and the difference is still Very big. So how many types of cards do we have in our lives?
How many cards are there?
There are many different types of cards, but they are classified into three categories.
The first card is the simplest PVC card, including various discount cards and membership cards. It has the lowest technical content, and the information on the card is printed or suppressed, such as number, name, photo, barcode, etc. The amount of information is small, the production cost is low, and the anti-counterfeiting ability is poor. It is the same as the business card and coupon printed on paper, but it is durable. It is mainly used for people and people to exchange information. If you want to manage by computer, you must manually enter the card number or scan the barcode above.
The second type of card is a magnetic stripe card, the most typical of which is a bank's savings card and credit card. In addition to printing and pressing on the surface of the card, some of the information is stored in the magnetic strip on the back of the card, which needs to be read by a special card reader. It works in much the same way as a tape tape, which uses the magnetic properties of a magnetic strip to store information. The information printed on the surface of the card is for people to see, and the information on the magnetic strip is read to the machine. This is done to facilitate computer management. Moreover, there is encrypted information in the magnetic strip, which is more anti-counterfeiting and more stored information. At present, some banks have also introduced such mini-cards, which store the same information, but many automatic deposit machines cannot be used.
The third type is an IC card, also called a chip card, that is, there is a small integrated circuit inside the card. This kind of card is divided into two kinds according to the appearance. One type of chip contact is exposed. To read the information inside, it must be inserted into the card reader. For example, our Peony transportation card, electric card, SIM card of the mobile phone do not look a little, it is also a complete chip card;
The other surface may not be visible, but it has a small chip and an inductive antenna hidden in it. Just put it in the vicinity of the card reader and read the information in the card. For example, our entry card, bus card and second-generation ID card, etc. This so-called non-contact IC card has the highest technical content, the best confidentiality and the most durable. The thickness of such cards is thin because the size of the chips and antennas inside are not the same. The bigger and thicker, the simpler and lower the cost.
Regardless of the type, the chip card is mainly for the machine to read, so that people can use the computer for management.
(Interview with Minghua Aohan: IC cards are divided into two types according to their functions: one is a simple memory card, which is related to storage, and the other is a CPU card and a card with logical encryption. )
So which kind of card information is large? Which card is more convenient? Which card is safer?
Brush out your message
Let me talk about various magnetic stripe cards first.
In the past, when you saved money and took money, you had to take a passbook, go to the bank to line up, and deal with the bank staff face to face, which was a delay. After the bank card is popularized, we can handle all kinds of business and go directly to the ATM machine for self-service. Therefore, the appearance of the card is actually to facilitate the communication between people and machines.
This is a medical card for a hospital in Beijing. Everyone who goes to the hospital to see a doctor must first make a magnetic stripe card. When you register, you should brush it. When you pay, you should brush it again. a bit. The purpose of this is to record your medical information on the hospital's system, so that the hospital can be managed by computer.
Although magnetic stripe cards are widely distributed and widely used, magnetic strips are low in storage, easy to be scratched, worn, or even degaussed, resulting in data missing or unreadable, so in some areas, such as finance, future Was gradually eliminated.
(Interview with Minghua Aohan: Magnetic stripe is one of the most insecure cards, it is only a small amount of information to access and read and write, it must have a large database to support in the background, and this database must be very safe, and there are a series Engineers to maintain this database to achieve security.)
More compact than the magnetic stripe is the chip card, which is read and written by direct contact between the chip contacts and the contacts in the card reader. At present, its application is becoming more and more extensive. In addition to Peony transportation cards, electric cards, telephone cards, mobile phone cards, and even the Beijing Higher Education Self-study Examination, such cards are used for admission examination.
However, such cards are also defective. First, frequent plugging and unplugging can cause contact wear, resulting in poor contact and data transmission errors. In addition, the card read and write speed is relatively low, only one card can be inserted at a time, plus the insertion and removal action, there is a waiting time. If the plugging force is not properly applied, it is easy to cause damage to the chip.
It is because of these shortcomings that people have invented non-contact IC cards.
Contactless card
The contactless IC card actually encapsulates the chip in the card. It uses wireless radio frequency technology, that is, RFID. Although the chip in the card has no power supply, it can move in the electromagnetic field emitted by the card reader to generate the sensor. Current, the information in the card is sent back. It reads cards fast, the card reader can process multiple card information at the same time, and it is not easy to damage.
Our municipal bus card is chosen for non-contact cards for this reason.
Bus and subway commuting are very crowded. Imagine if you put a card into the card reader during the peak hours, your card has not been pulled out, and the people behind you are starting to squeeze you. The card is likely to be Broken in the card reader. With a contactless IC card, this problem can be solved. Holding the card and touching the card reader, you can get on the bus without any operation.
Many parking lots have also begun to use non-contact cards as timing vouchers. When the vehicle enters the parking lot, the card is placed in the card reader sensing area of ​​the entrance and exit, the card reader will recognize the card, and then compare with the internal record of the computer to determine the parking time and other information.
There are also a large number of such cards used in schools and units. This is a campus card. Whether you go to the cafeteria to eat, borrow a library from the library, or take hot water or take a bath, just use this card to lightly brush it and you will not have to take your student ID and money all day. I ran around in school.
The unit's doorway uses a contactless card to collect information about each person's access, as a basis for attendance.
Our second generation smart ID card is also a contactless IC card. The previous ID cards are handwritten or printed, and it is easy to forge. The relevant department should check the identity of a person and enter the ID number into the computer, and then check the information in the database. The second generation ID card is equipped with a chip. As long as the card is close to the reader, the information in the ID card can be read. If a criminal is falsified, he can only make the appearance of the card, can't make the chip inside, and put it on the scanner, the ID card is true and false.
Although the contactless card is easy to use, there are also some shortcomings.
(Interview with Minghua Aohan: In terms of capacity, the contact card is the largest capacity card in the world last year. Now it has reached 1M byte, not the maximum capacity of the contact card, for example, like the card of Beijing Municipal Traffic Card. We issued this card is 4k bytes, the capacity is unmatched)
Cao Difei: In addition to capacity, security is also a concern for everyone.
Yu Qiu: When it comes to the security of the card, everyone has a lot of questions. For example, it is small and placed in a pocket. One day, one accidentally lost the card. What if someone else steals money or information?
Cao Difei: If you have a password, you are not afraid.
Less and less money on the body
More and more cards in the bag
In the era of card rampage
What do we really understand?
"Science and Education Watch" reveals the secrets of various cards
Safety performance competition
In fact, our cards can be password-based. Like a bank card, because there is a large amount of deposits in it, you must set a password when you are in the card. For cards like the municipal bus card and the meal card, although you can set a password, there is not much money, so it is generally unnecessary. Enable this feature.
(Interview with Minghua Aohan: IC card, he has a password protection, there is a chance of verification. If you have the card stolen, if you illegally lock the card, it will be automatically locked, it will be useless. Can only read the information and can not modify the information. Non-contact card also has password protection, can only read and can not write, so when others use it, can only read the information of this card, can not be changed. )
(Interview with Zebra: For example, I have set a password for this traffic card. Do you ask passengers to change the card and enter the password at the same time? If you do this application, it will definitely affect the speed of getting on and off. We have to lose the password itself. Not suitable for such an application)
Cao Difei: The more cards are issued, the more the functions are gradually upgraded. The mainstream of the future will be contactless cards.
Yu Qiu: But some people worry that the contactless card can be swiped at a certain distance. For example, if the person in front buys something, you will be bothered by the wrong brush behind.
Cao Difei: There are still people worried that if there is important information in the card, what should the criminals do with the card reader from the side?
Yu Qiu: In fact, this kind of worry is not necessary.
Although the theoretical non-contact card can read the information in the card within 15 cm, the card maker can adjust the distance according to the use environment during production. For example, the card of the parking lot can be set farther, the hand tide The driver does not have to be afraid of it, and the bus card and canteen card can be set closer. You can only remove the money if you stick it on the card reader.
In addition, when reading the card, the card reader and the chip in the card will perform two-way verification, mutual recognition can communicate information, and the confirmation number of each chip is fixed at the time of production, there is no re-sample, you read the card The information cannot be forged.
(Interview with Minghua Aohan: Non-contact cards are a trend because non-contact card operations are very convenient, but ICs can't be completely replaced, because the cost of contactless cards is very high, unless chip suppliers To reduce costs, and the price of contact cards is comparable, it is possible to fully popularize contactless cards.)
Cao Difei: Today, this tone has told you so much. I don’t know if you understand it?
Yu Qiu: It doesn't matter. If there is anything unclear, you can call us at the bottom of the screen to ask questions. I hope you understand the card and use the card with confidence to make life easier.
Cao Difei: Ok, let's take a look at the recent technological trends.
RCG knows you
Our face and finger prints become the password to open the door and start the computer. If you steal something, the company's security system can also capture the face of the thief. These are the biometric technologies that Hongba Digital has shown us. They announced that they joined hands with Digital China to enter the Chinese market, and also signed a contract with Guangliang as their image spokesperson.
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