Data communication method and system

Abstract

The invention provides a data communication method and system. The method comprises the steps that in the process that a first terminal sends a level signal of first data, the first terminal starts first timing when the level change of the level signal at a first wired communication interface meets the timing triggering condition; a second terminal processes the first data to obtain second data; in the process that the first terminal sends a level signal of third data, the first terminal starts second timing when the level change of the level signal at the first wired communication interface meets the timing triggering condition; the second terminal receives the level signal of the third data and signs to-be-signed information to obtain signature data; the second terminal sends a level signal of fourth data; the first terminal receives the level signal of the fourth data and obtains a second time value that second timing reaches when the level signal of the fourth data starts to be received; and the first terminal conducts signature verification operation on the signature data and verifies whether or not a first time value and the second time value are matched.

Description

technical field [0001] The present invention relates to the field of electronic technology, in particular to a data communication method and system. Background technique [0002] When the electronic signature device communicates with the host device (such as PC equipment, mobile device, etc.), the host device sends the data to be processed to the electronic signature device, and the electronic signature device receives the data to be processed and performs corresponding processing on the data to be processed to obtain After processing the data, the electronic signature device sends the processed data to the host device. According to the existing communication protocol, if the host device receives the processed data within the specified waiting time, it will consider the received data as normal data and continue to follow up. operations (for example, transaction operations, authorization operations, etc.). [0003] However, if there is data communication between the electron...

AI Technical Summary

Problems solved by technology

[0003] However, if there is data communication between the electronic signature device and the host device, a third-party illegal device remotely hijacks the data transmitted by the two, and performs illegal operations such as forwarding or tampering to obtain illegal data, as long as it can be specified in the existing communication protocol Return the illegal data to the host device within the waiting time, the host device still considers the illegal data received as normal data, and will continue to use the illegal data for subsequent operations, which affects the security of subsequent operations

However, the use of existing technologies cannot guarantee the security of data transmission, and cannot effectively identify illegal data after data remote hijacking occurs.

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