Cross-network security e-mail system

Abstract

The invention relates to a cross-network security e-mail system. The system comprises an entrance host B connected with a low-security-level network, and an exit host D connected with a high-security-level network. A one-way data transmission channel between the outlet host D and the internal host C is composed of a general optical transmission module and a single optical fiber and provides a response data return channel. The internal host C and the internal host A are connected through an optical transmission module and a single optical fiber, and the internal host A and the entrance host B are connected through an optical transmission module and a single optical fiber. A transmission channel of the data request is from the entrance host B to the exit host D. A data response transmissionchannel is from the outlet host D to the internal host C to the internal host A to the inlet host B. The entrance host B is responsible for receiving a request or data from a low-security-level network, and the exit host D sends the request or data to a high-security-level network, receives a response message from the high-security-level network, and does not receive a request actively initiated by the high-security-level network.

Description

technical field [0001] The invention relates to network security technology, in particular to a cross-network secure email system. Background technique [0002] With the development of informatization, horizontal information sharing across organizations and vertical information sharing within organizations has become an irreversible trend in the informatization construction of various enterprises and institutions. As one of the main tools for office contact and business communication of the staff of party and government agencies, public institutions and state-owned enterprises, the email system stores a large amount of business information. Security isolation, on the other hand, in order to improve the timeliness of email processing and work convenience, users need to view and download email information generated in the low-density network in the high-density network, that is, the low-density information can be unidirectionally imported from the low-density network To the h...

AI Technical Summary

Problems solved by technology

Most users in corporate mailboxes use the receiving function much more frequently than the sending function. For example, when they receive new notifications, project plans, official documents and other mass-sent emails, they only need to know the content and do not need to reply. However, even dealing with such simple matters must be based on the premise of network switching. In reality, due to the cumbersome cross-network mail processing process or the lack of corresponding physical environment around the user, the phenomenon of untimely check of mail and poor information flow often occurs. The smooth development of this work and the normal progress of the project have brought certain risks

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