  Advancement in artificial intelligence (AI) and machine learning (ML),
dynamic data driven application systems (DDDAS), and hierarchical
cloud-fog-edge computing paradigm provide opportunities for enhancing
multi-domain systems performance. As one example that represents multi-domain
scenario, a "fly-by-feel" system utilizes DDDAS framework to support autonomous
operations and improve maneuverability, safety and fuel efficiency. The DDDAS
"fly-by-feel" avionics system can enhance multi-domain coordination to support
domain specific operations. However, conventional enabling technologies rely on
a centralized manner for data aggregation, sharing and security policy
enforcement, and it incurs critical issues related to bottleneck of
performance, data provenance and consistency. Inspired by the containerized
microservices and blockchain technology, this paper introduces BLEM, a hybrid
BLockchain-Enabled secure Microservices fabric to support decentralized, secure
and efficient data fusion and multi-domain operations for avionics systems.
Leveraging the fine-granularity and loose-coupling features of the
microservices architecture, multidomain operations and security functionalities
are decoupled into multiple containerized microservices. A hybrid blockchain
fabric based on two-level committee consensus protocols is proposed to enable
decentralized security architecture and support immutability, auditability and
traceability for data provenience in existing multi-domain avionics system. Our
evaluation results show the feasibility of the proposed BLEM mechanism to
support decentralized security service and guarantee immutability, auditability
and traceability for data provenience across domain boundaries.
