Abstract
This paper defines a new DNP3 link layer frame structure based on the link layer packet characteristics of transmission time requirements and security requirements in substation automation system (SAS). The new frame structure can provide three different work modes: authentication, authorization-encryption, non-authenticated encryption. Then we propose a link-layer security service mechanism in substation automation system based on the GCM-AES, including the session key agreement protocol based on EKE, GMAC-based message authentication protocol, GCM-AES Authentication Encryption-based DNP3 protocol and GCM-AES-based message transform algorithm. Through experimental calculation and analysis, the results show that the new security mechanisms achieve the efficient and safety in substation packets transmission.
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