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Secure transmission device

A technology for safe transmission and equipment, applied in transmission systems, electrical components, etc., can solve the problem of high cost and achieve the effect of simple connection and small size

Inactive Publication Date: 2011-09-21
GUANGZHOU FEIYUAN INFORMATION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current implementation technology cannot guarantee the complete unidirectionality of transmission from the hardware, and has the characteristics of returning information. There is a problem of returning control signals on the private protocol, and it is impossible to physically prevent data from being sent from the internal network to the external network. Moreover, it is necessary to transform the internal and external network application system, which is costly

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0028] like figure 2 As shown, the PCs at both ends of the sending end and the receiving end are connected by USB, and the sending end and the receiving end are on the same circuit board. The PC interface protocol conversion unit and control unit of the sending end and the receiving end are realized by the USB controller CY7C68013 of CYPRESS Company. The USB controller CY7C68013 includes a USB protocol conversion unit and a GPIF general programmable interface, which can complete high-speed USB transmission without additional chips. The GPIF general programmable interface of the USB controller CY7C68013 completes the seamless connection with the FIFO FIFO unidirectional memory, and realizes the control unit function of writing data into the FIFO unidirectional memory or reading data from the FIFO unidirectional memory.

[0029] The PC interface protocol conversion unit and control unit of the sending end and the receiving end can also use the controller AT91SAM9261. The AT91SA...

Embodiment 2

[0033] In this implementation mode, on the basis of the first embodiment, the connection mode of the PC terminal is changed to a serial port mode, so as to support occasions where there is no USB interface and the speed requirement is not high, and the block diagram is as follows: image 3 shown.

[0034] The PC interface protocol conversion unit of the sending end and the receiving end uses the RS232 protocol conversion unit, and selects the Maxim MAX232 chip, which is a single power level conversion chip specially designed by Maxim for the RS232 standard serial port of the computer. It has the characteristics of high stability and convenient use. . Of course, you can also use other companies’ serial port level conversion chips instead, such as ST232 from stmicroelectronics, sp3223 from sipex, AMD232 from Analog Devices, etc.

[0035] The most commonly used AT89S51 is selected as the control unit of the sending end and the receiving end. Most of the processors currently on ...

Embodiment 3

[0038] In this implementation mode, on the basis of the first embodiment, the connection mode of the PC end is changed to the RJ45 interface mode, and the block diagram is realized as follows: Figure 4 shown.

[0039] The PC interface protocol conversion unit of the sending end and the receiving end uses a network protocol conversion unit and selects the chip DM9000. You can also choose other network protocol conversion chips, such as CS8900, RTL8019AS, DM9008, etc.

[0040] The control unit of the sending end and the receiving end uses the ARM9 controller AT91SAM9261 of ATMEL Company. Other controllers can also be used, such as ARM9 controller S3C2410, S3C2440; high-speed 51 series single-chip microcomputer C8051F350; FPGA controller EP2AGX45 and so on. Of course, the high-speed controller is emphasized here, and a general low-speed controller is also possible, but it has a relatively large impact on the data transmission speed.

[0041] This embodiment realizes the data ...

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Abstract

The invention provides a secure transmission device. The secure transmission device comprises a transmitting end PC interface protocol conversion unit, a transmitting end control unit, a FIFO unidirectional memorizer, a receiving end control unit and a receiving end PC interface protocol conversion unit, the transmitting end control unit reads data from the transmitting end PC interface protocol conversion unit according to certain time sequence and writes the data into the FIFO unidirectional memorizer, and the receiving end control unit reads the data from the FIFO unidirectional memorizer and transmits the data to the receiving end PC interface protocol conversion unit. The invention further discloses another secure transmission device comprising a transmitting end transmission device and a receiving end transmission device. In the secure transmission device provided by the invention, the FIFO (first in first out) unidirectional memorizer is used, and the unidirectional property of the data transmission is ensured on the aspect of hardware, so that data of an extranet can be transmitted to an intranet, but the data of the intranet cannot be transmitted to the extranet.

Description

technical field [0001] The invention relates to a safe transmission device for information exchange between internal and external networks. Background technique [0002] With the development of network technology, computer network is also facing increasing security threats. According to relevant parties, 63.6% of domestic enterprise users are at a "high risk" level, and the economic losses caused by network leaks in my country reach tens of billions every year. [0003] In the network applications of institutions such as governments and enterprises, it is often necessary to transmit data between the Internet and the intranets of these organizations. Due to the need for confidentiality, the external network system cannot access the internal network equipment. However, in some applications, the internal network system needs to transmit a large amount of data from the external network. According to strict confidentiality regulations, currently only CD-ROMs can be used to exch...

Claims

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Application Information

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IPC IPC(8): H04L29/06
Inventor 奚建清黄昱钊
Owner GUANGZHOU FEIYUAN INFORMATION TECH
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