Abstract
To solve the security problem of industrial Ethernet DNP3 protocol broadcast authentication, the attack vector and security requirements of trusted DNP3 protocol are analysed. First, the paper adopts a trusted platform into the control network and authenticates the identity and security status of the DNP3 client and server to prevent node sensitive information from being compromised. Second, a trusted DNP3-BAE broadcast authentication encryption protocol is proposed based on the hash chain method to solve the problem of missing message security authentication mechanism in broadcast mode, which only needs a key to complete the broadcast message authentication for multiple slaves. The new scheme can use the DNP3-SA encryption primitive, without a major upgrade to the existing platform. The protocol is verified by the SPAN tool; the results show that there is no intrusion path, which ensures the integrity, authenticity, freshness, and confidentiality of the communication nodes. At present, there is no public document to introduce a trusted platform into the DNP3 protocol to solve security problems. Performance analysis shows that our solution reduces the overhead of large-scale broadcast authentication at the expense of increased less processing and storage overhead.
Highlights
With the advance of Industry 4.0, information security research for industrial control network has become a hot topic
The industrial Ethernet protocol based on TCP/IP technology is widely used in SCADA system
The message sequence of the protocol given by SPAN analyses the protocol security from the perspective of the intruder and fails to form an intrusion path. This result indicates that the sub-protocol can securely authenticate the identity and status information of M and O and can safely exchange the keys KH and KE used by subsequent communications because the attacker cannot obtain the authentication key pair (AIK) key and bind-private key, cannot tamper with platform configuration register (PCR) and random number signature, and cannot decrypt the key KH and KE
Summary
With the advance of Industry 4.0, information security research for industrial control network has become a hot topic. The industrial Ethernet protocol based on TCP/IP technology is widely used in SCADA system. The requirement of remote monitoring of ICS field devices is realized, the original industrial Ethernet protocol is facing more threat of network attacks. The widespread use of the DNP3 protocol in the field of SCADA systems has proven unsafe [4,5,6]. Once the attacker made through the Ethernet into the internal DNP3 network, they can obtain and control the ICS data and sensitive operations by impersonating the DNP3 client and server. The DNP3 protocol must be researched and improved from the perspective of the communication side to ensure the communication security
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