Intrusion Detection on MIL-STD-1553B Bus via OMS Constructs
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Solution Overview
Problem
The MIL-STD-1553B standard, used in aircraft control/data busses, is vulnerable to cyberattacks and lacks specific designs for detecting and controlling network intrusion, particularly in the context of Computer Network Defense (CND) functions within the Open Mission System (OMS) standard.
Innovation Solution
An Intrusion Detection System (IDS) is developed using command and control (C2) constructs derived from the OMS standard, incorporating specific identification and authorization functions, anti-tamper provisions, and CND-specific C2 schemas to control IDS functionality, including XML-based controls for defining IDS/IPS behavior and configuring policies for anomaly detection on the 1553B bus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the MIL-STD-1553B standard is used for aircraft control/data busses, then critical subsystems can be controlled reliably, but the system becomes vulnerable to cyberattacks due to lack of intrusion detection capabilities
Solution Approach 1:
An Intrusion Detection System (IDS) is introduced as an intermediary component that monitors 1553B bus traffic without disrupting the existing control functionality. The IDS intercepts and analyzes packets on the bus, detecting anomalies and potential cyberattacks while allowing the original MIL-STD-1553B control operations to continue uninterrupted.
Solution Approach 2:
The security monitoring function is segmented from the original 1553B control system. The IDS operates as a separate monitoring layer that independently analyzes bus traffic, allowing the control system to maintain its original reliability while adding security capabilities through a distinct, dedicated component.
2Object-affected harmful factors
If traditional intrusion detection methods are applied to 1553B bus, then security monitoring can be implemented, but the system becomes overly complex and difficult to integrate with existing OMS constructs
Solution Approach 1:
The IDS is designed to work universally with existing OMS (Open Mission System) constructs and C2 (Command and Control) schemas. By leveraging existing OMS message formats and integration points, the IDS can monitor multiple subsystems and functions without requiring separate custom integration for each, thereby reducing overall system complexity.
Solution Approach 2:
The IDS implementation is made dynamic and adaptable to different mission phases and operational modes. The system can adjust its monitoring intensity and alert thresholds based on current system state, allowing it to scale its resource consumption and complexity according to actual security needs rather than operating at fixed maximum complexity.
3Measurement precision
If comprehensive anomaly detection is implemented on 1553B bus, then network intrusions can be detected effectively, but processing time and computational resources increase
Solution Approach 1:
The IDS implements partial monitoring by focusing on specific anomaly patterns and critical bus transactions rather than analyzing every single packet in exhaustive detail. It applies detection rules selectively based on mission phase and threat level, achieving effective intrusion detection while processing only the necessary subset of traffic that requires close scrutiny.
Solution Approach 2:
The anomaly detection operates periodically rather than continuously at maximum intensity. The system can adjust its scanning intervals and detection depth based on operational context, performing comprehensive analysis when threats are suspected while using lighter monitoring during normal operations, thereby balancing detection accuracy with processing time constraints.
Data Source
AI summary
A method can include command and control of a computer network defense (CND) system using open mission (OMS) constructs. A mission data file (MDF) is processed. A target interface, which is a 1553B bus, is determined from the MDF. A CND capability message that extends an OMS capability message and indicates the target interface is encoded. A CND command message that extends an OMS command message is decoded. The CND command message is validated. The target interface is bound based on validation of the CND command message. A CND command status message is encoded based on validation of the CND command message. The CND command status message extends an OMS command status message.