2. Matrix code: It is a kind of two-dimensional bar code. After encoding the graphics and data, it is converted into a two-dimensional arrangement of multi-grid black and white small square graphics. The information of this code is expressed by the small squares of the data. This kind of matrix code is also called ID matrix code. It can generally input text or data of any country under 2000, and the password matrix can be as large as 14 square inches and as small as 0.001 square inches. There are two kinds of matrix codes, one is Vericode; the other is Data matrix (Datacode) code. The matrix code printed on the trademark or commodity needs to input the image of the code into the computer through a CCD camera. After image recognition processing, the information stored in the matrix graphic can be displayed on the computer. This code can be widely used on cards, bills, trademarks, logos or commodities.
3. Machine-readable code: print the readable optical characters on the card and other carriers, and use a special recognizer to read it. The machine-readable code has established international standards, which can quickly and accurately check passports and other cards, helping to quickly clear customs.
4. Magnetic code: write the password on the magnetic stripe or print the password with magnetic ink, and read it with the magnetic decoder. Generally, the method of printing, coating or pasting can be used to fix the magnetic medium at a specific position on the surface of paper, card or certificate. Magnetic codes have been used in finance, communication control and other fields. It is easy to be altered and imitated for general commercial magnetic codes. In recent years, watermark magnetic stripe has been introduced. This magnetic stripe has 12 bits of unchangeable data, so it can prevent forgery and alteration. The magnetic stripe can also be combined with a hologram to make a holographic magnetic stripe, that is, the optical and magnetic information is locked together for comprehensive anti-counterfeiting. The resulting raster numbers and barcode numbers are independent, but the two complement each other. The huge identification formed by the holographic magnetic card Numbers are more difficult to decipher. During detection, a holographic magnetic card identifier is used.
5. Smart card: also called IC card, also known as integrated circuit card. The integrated circuit chip module with storage, encryption and data processing capabilities is encapsulated in a plastic substrate of the same size as a credit card, and becomes an IC card. The IC card has a large capacity, the reading and writing area can be arbitrarily selected, and has strong anti-magnetic, anti-static, and anti-ray capabilities. The information is stored for 10 to 100 years or more, and the number of reads and writes is 10,000 or even 100,000. Therefore, it has become a popular anti-counterfeiting technology and is widely used in various cards. Due to the small size and low cost of the chip module, some people have used it for the anti-counterfeiting identification of valuable goods in recent years.
6. Laser card: Due to its larger storage capacity, the maximum capacity of a card is 6.6M bytes; it can not be rewritten, durable, high temperature resistant, not afraid of magnetic fields, static electricity, and radiation interference, so it is very popular. The laser card has three application forms: hardware encryption, software encryption and human body characteristic encryption. This card does not have a strong self-management function, and the information is exposed on the card, which is easy to decipher. If you can use the IC card and laser card comprehensively to develop a composite card, its anti-counterfeiting performance will be better.
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