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An encryption card and encryption method based on rs422

A RS422 and encryption card technology, applied in the protection of internal/peripheral computer components, digital data authentication, etc., can solve the problems of inconvenient operation and difficult management of USBKey, and achieve the effect of solving inconvenient operation and preventing use

Active Publication Date: 2019-07-16
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention aims at the problem of inconvenient operation and difficult management in the field of electronic measurement, and the automatic test system uses USB Key for illegal use protection, and proposes an encryption card and encryption method based on RS422

Method used

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  • An encryption card and encryption method based on rs422
  • An encryption card and encryption method based on rs422
  • An encryption card and encryption method based on rs422

Examples

Experimental program
Comparison scheme
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specific Embodiment approach 1

[0026] Specific implementation mode one: combine figure 1 Describe this embodiment mode, an encryption card based on RS422 described in this embodiment mode includes a first level conversion circuit 1, a second level conversion circuit 2, a photoelectric isolation circuit 3, a DSP main control circuit 4, a storage circuit 5, Reset circuit 6 and clock circuit 7;

[0027] The first level conversion circuit 1 is used to convert the standard RS422 input signal sent by the external computer into a TTL level signal, and send the TTL level signal to the DSP main control circuit 4 through the photoelectric isolation circuit 3;

[0028] The DSP master control circuit 4 is the master controller of the encryption card, used for encryption calculation and communication with the external master computer;

[0029] The storage circuit 5 is used to realize the storage of the key;

[0030] The reset circuit 6 is used to reset the encryption card;

[0031] The clock circuit 7 is used to prov...

specific Embodiment approach 2

[0042] Specific implementation mode two: combination figure 2 and image 3 Describe this embodiment, this embodiment is the further limitation to the encryption card based on RS422 described in embodiment one, in this embodiment, the main control module and interrupt module realized by software are embedded in the described DSP main control circuit 4; Among them, the interrupt module is mainly responsible for reading the RS422 plaintext data sent by the external main control computer, and the main control module is mainly responsible for converting the plaintext data into ciphertext.

[0043] The main control module includes the following units:

[0044] Initialization unit: realize the configuration of the registers of the DSP main control circuit 4, ensure that the DSP main control circuit 4 can work normally, and initialize the DSP program variables;

[0045] Command identification identification unit: determine whether the command identification is set, if so, start the...

specific Embodiment approach 3

[0053] Specific implementation mode three: combination figure 2 and image 3 Describe this embodiment, this embodiment is based on the encryption method of the encryption card based on RS422 described in embodiment one, described encryption method is realized by the software embedded in DSP main control circuit 4, and described method comprises main control process and interrupt process;

[0054] The main control process includes the following steps:

[0055] Initialization step: realize the configuration of the register of DSP main control circuit 4, then carry out order identification step;

[0056]Command identification step: judging whether the command identification is set, if yes, then execute the encryption calculation step, otherwise, re-execute the order identification step;

[0057] Encryption calculation step: perform encryption calculation on the parsed plaintext according to the set key to form ciphertext, and then execute the ciphertext return step;

[0058]...

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Abstract

The invention provides a RS422 based encryption card and an encryption method, and relates to the field of electronic measurement. The RS422 plain data are sent to a DSP main control circuit by an external main control computer in sequence through a first electrical level switch circuit and a photoelectric isolation circuit, the RS422 plain data are received by the DSP main control circuit through the interruptions and when the amount of data reach the specified length through detections, the DSP main control circuit indicates that completed plain data has been received, command identifiers are set in place, when the command identifier information is identified by a DSP main program, the plain data are computed through encryption by adopting a symmetric encryption algorithm, so that encrypted texts are obtained, and finally the encrypted texts are sent to the external main control computer in sequence through the photoelectric isolation circuit and a second electrical level switch circuit. The encryption card can be integrated into the inner side of an automatic test system, through use of the encryption card and the encryption method, the secret keys can be set by utilizing the external computer through the RS422 port and are encryption processed, and the legitimate use of the automatic test system is safeguarded.

Description

technical field [0001] The invention relates to the field of electronic measurement, in particular to an encryption card based on RS422. Background technique [0002] In the field of electronic measurement, the automatic test system is used to realize the test of the object under test. In order to limit the use of the automatic test system by illegal users, USB Key is often used as the hardware encryption method used by the system. It is often necessary to unplug the USB Key during use. Because in the automatic test system, the computer with the USB interface is often integrated inside the system, which makes it more troublesome to use the USB Key, and it is inconvenient and difficult to manage the USB Key. A hardware encryption card is needed to be integrated into the automatic test system to realize Hardware encryption protection for automated test systems. Contents of the invention [0003] The invention aims at the problem of inconvenient operation and difficult manag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F21/72G06F21/77G06F21/30
CPCG06F21/30G06F21/72G06F21/77
Inventor 孙超马文坛张宗正马欢
Owner HARBIN INST OF TECH
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