SCADA file encryption method based on AES algorithm

Abstract

The invention discloses an SCADA file encryption method based on an AES algorithm. The method includes the steps that S01, an improved AES encryption and decryption algorithm is achieved; S02, modules are selected according to file processing modes; S03, the length of a secret key K and the secret key are input; S04, an expansion secret key is generated; S05, an encryption / decryption file is established; S06, 16 bytes are taken out from the file waiting to be encrypted / decrypted, and the taken-out data are stored in an intermediate variable; S07, the data in the intermediate variable are encrypted / decrypted according to the length of the secrete key, and the encrypted / decrypted data are stored in the intermediate variable; S08, if the file waiting to be encrypted / decrypted is encrypted / decrypted, the file is closed, and the second step is executed, or else the sixth step is executed. According to the SCADA file encryption method, encryption and decryption linear attack resistance and differential attack resistance are improved, fewer hardware resources are occupied, and the method is particularly suitable for upgrading original equipment without modifying hardware design.

Description

technical field [0001] The invention relates to the professional technical field of electric power monitoring systems, in particular to an AES algorithm-based SCADA file encryption method. Background technique [0002] Data monitoring and acquisition system (SCADA) is the basis for constructing many power supply and distribution network automation application systems. With the computer and network application technology becoming more and more extensive and in-depth in the power monitoring system, the issue of safe storage and transmission of information in the power monitoring system has been paid more and more attention. In the power monitoring platform SCADA, many important data and configuration information are stored on the hard disk in the form of files, and protecting these important data and information from being easily leaked has become an important factor related to the safety performance of the system. Most of these data are stored in files in plain text, and the...

AI Technical Summary

Problems solved by technology

Although the S substitution box designed by the traditional mathematical method has a very high degree of nonlinearity, it is difficult to get rid of its inherent disadvantages, that is, its algebraic structure is relatively simple; the S substitution box designed by the evolutionary method The box has natural randomness, so if the S substitution box designed by this method has no trapdoor, it is not easy to find the weakness, but the non-linearity and differential uniformity of the S substitution box designed by this method are relatively poor , especially when designing the big S replacement box, the gap is more obvious

[0005] In the prior art, the S substitution box of the AES encryption algorithm is generally obtained by mathematical methods, and the substitution box has linear redundancy, because although the S substitution box constructed by mathematical methods has good performance, its ability to resist algebraic attacks is relatively weak some

[0006] In the prior art, SCADA file encryption based on the AES algorithm is relatively weak in resisting algebraic attacks, because the S replacement box officially given by the AES encryption algorithm is obtained through mathematical methods, so this replacement box has linear redundancy, because Although the performance of the S replacement box constructed by mathematical methods is very good, there are still some weaknesses, which make it relatively weak in resisting algebraic attacks

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