All-Optical Unidirectional Transmission Information Security System

In recent years,various government departments,companies,institutions and organisations have developed and built many computer information systems with particularly high security and confidentiality requirements,many of which consist of two networks:an external non-confidential network and an internal confidential network.It is therefore very useful and important to develop a one-way secure transmission system between the confidential and non-confidential networks.For engineering applications,this paper focuses on the use of the one-way transmission characteristics of light in one-way communications to physically achieve a one-way transfer of data and explores the impact of one-way information transmission on network security.The main work and results of this paper are as follows.1、Analysis of the current situation of network security leads to the importance and necessity of unidirectional transmission,according to the actual different security levels of the customer under the unidirectional transmission of data and purely localized needs,respectively,from the processor and unidirectional transmission module to complete the demand analysis of all-optical unidirectional transmission information security system,for the subsequent design and development of a clear direction.2、CPU is the core of the computer,X86 architecture has outstanding compatibility and system adaptability,so this paper applies purely localized X86 processor implementation,and a detailed introduction to the microprocessor architecture and its peripheral circuits.3、One-way transmission module is the core of one-way information transmission,using localized custom fiber optic network card,fiber optic module and fiber optic patch cable composed of one-way transmission channel,test results show that has the ability of one-way transmission.4、Since one-way transmission without feedback,the Therefore,the BLP(Bell-La Padula)does not read up and write down the logic to establish the communication model,while using forward error correction technology and MD5 verification technology to ensure the accurate transmission of the system.5,built an all-optical unidirectional transmission information security system,to carry out experiments to send different file types of different sizes,in the confidentiality of poor,low security level of the external network to send data,in the confidentiality of strong,high security level of the internal network Receive data,at the receiving end to receive the data sent by the sender,the results show that the one-way transmission function has reached the expected demand.In this paper,the all-optical unidirectional transmission information security system designed by using the unidirectional nature of light is designed,implemented and validated and tested on a purely localized server.The test results show that synchronous signal reception without packet loss can be achieved at the receiving end,realizing unidirectional,efficient and secure data transmission from the unclassified network to the classified network,with the advantages of high reliability and ease of use.