Data downloading transmission expending card apparatus embedded in computer

Abstract

The invention relates to a data download transmission expansion card device embedded in a computer. The device is embedded in a target computer and is composed of a unidirectional data transmission module and a computer expansion slot interface unit. The unidirectional data transmission module is composed of a data channel unit, a data output interface unit, a control unit, a data input unit, a memory unit and an ROM unit. The device transmits the data stored in the computer to an external memory device in a unidirectional transmission manner, the use of the data channel unit and the high-speed data expansion slot interface in the computer greatly improve the data transmission speed; in addition, the device adopts a nonvolatile memory unit to store history log of operations by the device,which has an only identification number and improves security management of the device.

Description

technical field [0001] The invention relates to a computer-embedded data download transmission expansion card device, which belongs to the technical field of data security protection. Background technique [0002] Due to the needs of national information security, troops, government agencies and secret-related enterprises are all faced with how to ensure that low-secret equipment (including low-secret computers or low-secret storage bodies, such as U disks, mobile hard disks, CF cards, digital cameras, mobile phones, etc.) High-density devices (including high-density computers or high-density storage storage bodies, etc.) securely transmit file data. The so-called security is to ensure that during the data copy operation, the data can only be transferred from the low-secret level device to the high-secret level device in one direction, and the confidential data in the high-secret level device will not be leaked to the low-secret level device. At present, the commonly used m...

AI Technical Summary

Problems solved by technology

This method is not only inefficient, but also if there is a Trojan horse virus in the portable device or human error, it will lead to the leakage of confidential data

In the published patent CN200710129797.5, a system to solve the above problems is proposed, but the one-way data transmission device involved in the system is external to the computer and cannot be built into the computer. Therefore, when the device is powered on and used every time, the user must manually Connecting two storage devices to the two interfaces of the data transmission device will be cumbersome for users who often use the device, and for users with limited space or who do not like external devices on the computer, all external devices will be hoped. built-in

In addition, the one-way data transmission device external to the computer must be connected to an interface of the computer, and these interfaces are two-way data interfaces, so users can illegally skip the one-way data transmission device and directly copy data through the interface of the confidential computer. Unable to prevent subjective stealing during the copying process, there is still a certain risk for confidential storage devices

like Figure 4 It is the structure of the one-way data transmission device proposed in the published patent CN200710129797.5, in which the processor needs to complete all the logic control, all data reading, all data processing and data output functions inside the system, resulting in the system can only be in A serial working state, so the performance requirements of the processor are very high, which increases the cost of the system and also limits the data transmission speed of the system, especially when transmitting large-capacity data files such as images and videos. The waiting time for data transmission can be very long

In addition, the system involved in this patent does not securely record the key historical information during the one-way data transmission operation, so it cannot provide strong evidence for the verification work after the leakage incident, and it is not convenient for confidentiality management.

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