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Intelligent substation communication message integrity protection method

A smart substation and integrity protection technology, which is applied to secure communication devices and key distribution, can solve problems such as insufficient security strength, achieve the effects of improving information security, improving security, and realizing integrity verification and identity verification

Inactive Publication Date: 2018-09-04
ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to improve the defect of insufficient security strength of traditional fixed key information security reinforcement measures in smart substations, the present invention provides a method for protecting the integrity of communication messages in smart substations using a key update mechanism, which can effectively reduce the risk of keys being cracked , to improve the security strength of smart substation communication

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] The invention is a method for protecting the integrity of a communication message of an intelligent substation, which includes the following content:

[0023] 1. HMAC process

[0024] In the network communication environment, in addition to preventing the message from being leaked, it is also necessary to prevent the message from being modified by a third party during the transmission process, including: message insertion, content modification, sequence modification and timing modification, that is, delay and replay of the message. HMAC message authentication can be used to resist these types of attacks.

[0025] HMAC is a key-related hash operation message authentication code. HMAC operation uses a hash algorithm, takes a key and a message as input, and generates a message digest as output.

[0026] The HMAC algorithm is described as ...

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Abstract

The invention discloses an intelligent substation communication message integrity protection method. An HMAC process that is currently adopted is a fixed key mode, and is secure in a short time, however, in the long term, the risk that a key is cracked is high, and if the key is cracked, the communication security is directly affected. According to the scheme of the invention, a negotiation-basedkey update mechanism is applied in the HMAC process, the integrity authentication and identity authentication of an intelligent substation message can be implemented, and the information security level of a power system can be improved; and according to the scheme of the invention, a number flag bit N is added at the end of the transmitted message, and when the value of N is progressively increased to k, the key is updated, an XOR operation is performed on a new sequence and an initial key, so that new keys can be continuously generated, and the synchronization of key updates is also verified.

Description

technical field [0001] The invention belongs to the field of information security of intelligent substations, and specifically relates to a method for strengthening information security by applying a negotiation-based key update mechanism to realize the HMAC process of intelligent substation messages. Background technique [0002] With the country's strong support for smart grids, the proportion of information network applications in power systems is also increasing. While computers and networks bring convenience to the power system, they also generate information security issues, which cause many hidden dangers to the operation of the power system. The smart substation is a crucial node in the smart grid, and its functions are voltage conversion, power distribution, control and management of power transmission and distribution, etc. The safe and reliable operation of smart substations is the guarantee for the stable operation of the entire power system, and is of great sig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L29/06H04L9/08
CPCH04L9/0891H04L63/08H04L63/123
Inventor 宣晓华方芳陆承宇王松孙文文汪冬辉谢吉华陈清杨涛阮黎翔吴栋萁丁峰
Owner ELECTRIC POWER RES INST OF STATE GRID ZHEJIANG ELECTRIC POWER COMAPNY
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