Information communication between networks is greatly growing, and its security becomes more important. In this article, a new way of network security communication, namely bar code communication was investigated. It used the general principle of the computer to quantify the information and generate the barcode instantly, and it was showed by using the micro-display. Then the micro-camera is used to identify the barcode on the display to restore the original information in the optical

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... Faster and more efficient communication technologies, such as the principle of macro wireless communication technology, can receive complete information to achieve the purpose of information transmission. The bar code information communication method was one-way and irreversible, and it was safe and can ensure communication security between networks. It is the fourth communication method different from wired, wireless and medium modes: one-way bar code communication mode (referred to as "one-way communication"). Communication refers to the exchange and transmission of information between persons, or between humans and the nature of that transmission through a certain action or medium. In a broad sense, it may be that two or more parties, in need of information, voluntarily adopt any method or medium to transfer messages from one party to any other party, accurately and safely [8] . In short, the process of message transmission is the transmission or exchange of information from one point to another through a certain medium. The purpose is to realize information transmission or exchange; in other words, communication is the transmission or exchange of information in some way between different subjects. In this sense, any transmission or exchange of information from one subject to another, regardless of the method or way of communication employed, is "communication". Now, signals passing through channels could be languages, sounds, words, images or data, constituting multimedia communication. With wired and wireless communication facilities, integrated with communications in the broad sense, e.g., television and computer networks, have now developed information ports and high-speed channels. Thanks to the use of single-photon and optical amplifiers, communication rates can be raised to 2Mbps or even higher. It's safe to say, the communication rate, in the future, may be something we cannot predict or describe now. Barcode Communication Barcode communication refers to a special way of communication to transmit messages between networks or subjects, by employing basic principles in computer application and optical principles of barcode technology. It is a communication method that uses an RFID reader to read and collect barcode information, and verify that information artificially [2] . Barcode, generally speaking, refers to a onedimensional code and a two-dimensional code. The most common application of this one-dimensional code communication in our daily life is the barcode scanner to check goods in the supermarket, and the two-dimensional code is used in train ticket management, vehicle management and hospital lab report management, etc [9] . The highest requirement for communication is accurate, fast and efficient. In comparison with one-dimensional code communication, two-dimensional code communication, obviously, enjoys more advantages. In general, barcode communication in this paper refers to two-dimensional code communication. Of course, with the development of science and technology, surely there will be a three-dimensional code, four-dimensional code and other multi-dimensional codes, even color codes, multi-color codes or multidimensional color codes, and their corresponding "barcode communication". Basic Contents Basic Principles For security reasons, the general principles of computer technology, optical principles of barcode technology (e.g., RFID technology), and micro-range wireless communication technology (e.g., NFC technology) are employed for one-way communication between different networks. It is a combination of two different simplex communications (one main communication and one auxiliary communication). The main message transmission is in the form of a barcode (the barcode information for each transmission includes the message to communicate and the description or definition of the quantity of message to be communicated. The described or defined "unit" is the basic unit of information quantity. As the information is transmitted, basically, in barcode, this communication is named "barcode communication"); the auxiliary feedback message is transmitted in a separate (different but not slower than the primary communication rate), faster, more efficient way, e.g., micro-range wireless communication technology NFC. Therefore, other means The invention of Inter-network One-way Barcode Communication (OBC) provides us with a safe, brand-new way of message publication. In reality, it enjoys vast prospects [15, 16] . One-Way Data Acquisition A new and safe information acquisition method is namely acquiring relevant information for publication. Information for publication in the past was usually collected directly or indirectly from media (paper and magnetic media), wired communication with firewalls, etc. In the case of media, information collection may not be timely, and the media can be infected with viruses, damaged or lost; with wired communication with firewalls, there exists potential safety hazards, and the information, too, can be damaged or lost. Obviously information security remained a problem in the past, regardless of the communication methods. With internetwork, OBC, however, communication safety can be guaranteed completely, as long as the development of barcode generation and decoding software is properly regulated and magnetic interference is avoided.