To be resilient, a system must be adaptable. Trustworthy adaptation requires that a system can be dynamically reconfigured at runtime without compromising the robustness and integrity of the system. Traditional certification practices have conservatively required critical systems to be static, and required assessment of the entire integrated system for certification. Adaptability has been at odds with certification. Adaptive MILS will extend MILS, a successful paradigm for rigorously developed and assured composable static systems, with adaptation mechanisms and a framework within which those mechanisms may be safely and securely employed for reconfiguration within the constraints of a configuration policy.

The Need for Trustworthy Adaptive Systems

Critical infrastructures, systems of autonomous systems, cloud computing for safety- and security-critical applications, are all dynamic systems that demand reliability, robustness, resilience, security, and other attributes we refer to generically as dependability. These systems while proving highassurance must be developed, certified, deployed, and maintained at an affordable cost. Moreover, the modern environment has become hostile for the critical infrastructures requiring constantly adapting their safety and security behaviour.

Extending MILS to Adaptive Systems

MILS is a component-based approach to develop and certify critical systems. Current MILS implementations provide only for fixed runtime architectures as they are based on statically configured MILS platforms. That is, the configuration information used to configure the exported resources of the separation kernel, and other MILS resource-sharing foundational components making up the MILS platform, is finalized before initialization of the MILS platform. After initialization there is no creation or destruction of exported resources, and no changes in the information flow policy. This is a characteristic shared with safety-critical real-time operating systems (RTOSs). The rationale, inherited from the safety domain, is that only static systems can be adequately well understood and analyzed to achieve the required level of confidence that they will behave as expected. The approach has also been applied to security-critical systems needing the highest levels of assurance. A MILS platform that implements a full and flexible ability to change its configuration during runtime is said to be dynamic.

Project Objective

The CITADEL project will build on the MILS technology accomplishments of D-MILS and Euro-MILS, and perform the research and development necessary to create adaptive MILS systems. We propose to use adaptive MILS in new and evolving adaptive systems contexts having strategic focus within the EU, such as Critical Infrastructures and the Internet of Things, where adaptability is a crucial ingredient for the safety and security of future systems, and where the rigorous construction and verification made possible by MILS holds particular promise.

The project expects to achieve in its final phase the demonstration of the capabilities of the adaptive MILS technology in several industrial contexts and application scenarios, and lay the technical foundations for a certification framework for the use of adaptive MILS components and systems in critical infrastructure applications.

CITADEL is an Innovation Action partly funded by the Horizon 2020 Programme of the European Union under grant agreement no. 700665.

Project News

CITADEL project meeting 13-14 June 2017

The CITADEL partners will hold a project meeting for all partners on 13-14 June 2017 hosted by project partners OAS and ATB in Bremen, Germany. The meeting will focus on discussions regarding the technologies being developed within each of the planes that comprise the adaptive MILS system for protecting Europe's critical infrastructures.

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MILS Workshop at EmbeddedWorld 2017

The 3rd International MILS Workshop has been organized during EmbeddedWorld 2017 under the umbrella of the MILS Community and certMILS project. The event attracted about 60 people from various industries. The papers and presentation have been published and are available on the MILS Community website.

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Project Partners

The CITADEL project receives funding from the European Union's Horizon 2020 Research and Innovation Programme under grant agreement No. 700665.
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