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METHODS FOR SECURING SUBSTATION LAN COMMUNICATIONS

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scenarios are commonly referred to as hacking. LAN Information Security. Information security refers to methods employed to ensure Confidentiality ...

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METHODS FOR SECURING SUBSTATION LAN COMMUNICATIONS Page 1METHODS FOR SECURINGSUBSTATION LAN COMMUNICATIONS David DolezilekSchweitzer Engineering Laboratories Inc. Pullman WA USA ABSTRACTAt the heart of both the value and the vulnerability of power substation communication is the ability to remotely access protection control automation and SCADA equipment. These communications are becoming increasingly important to the engineering and operations staff ofutilities yet they may leave systems vulnerable to electronic intrusion. Electronic intruders randomly or maliciously operating circuit breakers reclosers and switchgear or changing current transformer ratios would have disastrous consequences on the safety reliability and performanceof our electric power systems. In light of these vulnerabilities the need for effective procedures and techniques to reduce thechances of electronic intrusion is increasingly evident. Wide Area Network (WAN) communications has received a lot of general attention lately. This paper however goes beyond general and is a tutorial on how to deploy several very effective communication security methods within the substation Local Area Network (LAN). These methods include secure control ofsubstation devices and of information access to these devices using any remote connectionmethod such as traditional inservice telephone modems and radios digital modems and Virtual Private Networks (VPNs). Robust lockout of unwanted connections including third party backdoor access and passwords is also performed. These features are already available in substation devices to manage connections and response to messages. They detect and lock out illegitimate access by monitoring locally and remotely the status of connections and configuration. Finally they thwart malicious activity by using settings changes to reconfigure the substation in response to a communications breach. We discuss practical examples for several proven methods. Secure password met ...

Source: www.selinc.com

 

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