Security seal from two aspects: First, seal the unforgeability; Second, the printed text of the differential can be. Can not solve the problem of forged from the need to seal materials, production technology, production equipment, and other aspects (to strengthen the management of other topics for discussion); and the text can be printed from the stamp pad ink to identify the problem, image recognition, the establishment of the archives of the seal, and other areas.

     Laser technology and computer technology is cutting-edge contemporary science and technology. The birth of these two technologies, and immediately caused a revolution in the printing industry. Laser Phototypesetting replaced the centuries of moveable type. Type layout is almost extinct in China. Phototypesetting inspired by the laser, the two will soon introduce technology to create and seal the area of security.
       
     Typesetting computer has greatly enhanced the level of seal technology and production speed, and laser engraving has been successfully replaced by die-plate, hand tool and electro-optical tracking methods, arising from relevant departments and experts of the attention.
   
     The monochrome laser, high-brightness, the advantages of a good direction, materials widely used in processing, such as laser heat treatment, cutting, welding, marking and so on. In these occasions, an invisible laser used as a "tool" in the role of the material, so that the material melted, vaporized, forming a variety of processes. Advanced industrial countries are to be included in laser processing and advanced manufacturing technology to promote. Laser engraving is the principle: a laser beam through optical transmission organizations and focus on the surface of materials, high-energy density laser beam at the role of the rapid evaporation of the material to form a pit point. The use of computer-controlled laser-driven xy console in the first movement and in accordance with the requirements of the laser control switches, image processing software, information has been stored in a computer in one way or another, when the sequence from the computer to read information on the laser head along Scanning the track from left to right from top to bottom line by line scan back and forth. Every time scanning to a "1" point, to open the laser scanning to a "0" point, so that the laser off. We know that the computer information storage is carried out according to the binary, which coincided with the laser switches two states in line.

     At present, the seal will pop a little typesetting software can be used to transform the laser scanning table, computer components, such as special laser engraving equipment. As a result of such equipment and YAG lasers are generally two types of CO2. YAG to marking of metal, not easy to achieve the desired depth. In this can not be used to seal carving. CO2 laser and non-metallic materials suitable for carving. On the seal, rubber, horns, organic glass, marble, jade, ink pad storage timber, such as lithography can achieve better accuracy and depth. CO2 laser power to choose 1-20 watts. Lithography of a chapter 3-5 minutes, 15-30 minutes official seal. At present, the laser equipment condenser point less than 0.1mm. Mechanical resolution 0.025mm positioning accuracy repeat 0.1mm. Lithography in full compliance with the seal of the seal industry standards.

     Laser engraving for that security can do? One of the ways technology can not be forged, very difficult to copy by hand; Second, it is easy to the computer security typesetting in many of the measures adopted by the reflected laser engraving. This is the technology from other methods of the biggest advantages. For example, lithography bar codes, codes, secret mark, not to repeat the dot-matrix, graphics, patterns and so on; Third, the easy-to-computer archives, set up in the archives of the seal, easy-to-computer printed text and image recognition in the archives of the chapter-like compared to identify.
      
    China is a seal of the great powers. Security should seal the two-step: the current management should be strengthened, as far as possible, using some of the existing primary means of security. At the same time, it is necessary to strengthen the seal in the high-tech industry. Through in-depth investigation, has repeatedly argued that scientific and technological, research a set of practical criteria for the seal, seal process, seal materials and seal equipment, the establishment of the network to identify and manage the system. To form a national unity professional system.

     Security seal is a complicated systematic project, to rely on government departments, research institutions, business co-operation. Huazhong University of Science and State Key Laboratory of laser technology and laser processing of national engineering research center dedicated to laser technology to send out, and enthusiasm will be related to technology brother's unit, please come in, the establishment of friendly and cooperative relations. To seal our security technology, in order to seal the industry's contribution to the prosperity and strength.