Abstract. While facing an increasingly globalized market place, the ever-increasing drive for efficiency and rapidly developing consumer demands make the successful digital transformation of Legal Metrology unavoidable. This will include the use of contemporary technologies, such as embedded systems, Internet of Things, Cloud Computing and Big-data. There is a need for legally compatible system architectures, digital services and an appropriate infrastructure to benefit the industry, the notified bodies and the market surveillance authorities, by removing barriers to innovation and reducing costs and time to market for new products which use these technologies. This paper focuses on the development of a digital quality infrastructure; the "European Metrology Cloud", designed to support the processes of conformity assessment and market surveillance and the development of reference architectures and new technologyand data-driven services for this infrastructure, fostering the digital single market that the European Commission envisions.

In Europe, measuring instruments under legal control are responsible for an annual turnover of 500 billion Euros and contribute a significant part to the economy including establishing trust between all stakeholders. In this article, a secure cloud reference architecture for measuring instruments is presented, addressing both requirements and roles in the Legal Metrology framework. With the introduction of Cloud Computing in Legal Metrology, a new role of a Cloud Service Provider has to be established. The general approach of the reference architecture shall be evaluated to determine if Cloud Computing can be integrated into the legal framework. In a bottom‐up approach, each layer of the cloud is addressed and carefully tested against the essential requirements for Legal Metrology. Splitting a well‐contained measuring instrument into a distributed measuring system creates new challenges guaranteeing security and integrity of the measurements. Addressing these problems, technologies such as fully homomorphic encryption are evaluated, improved, and implemented to enable calculations on encrypted measurements. In addition, a secure communication protocol for encrypted data is presented to address the demand of integrity of encrypted measurements throughout their lifecycle. Lastly, a continuous monitoring approach is presented to detect anomalies and to classify the system behavior depending on their severity and impact into three categories: green, yellow, and red.

The digital transformation of sovereign processes is a driving force to streamline and innovate processes for measuring instruments under legal control. Providing trust is the essential purpose of Legal Metrology and still a challenging task in the digital domain. Taking the strict legal framework into account, a distributed software architecture is presented that offers privacy, security and resilience. At the same time, the platform approach seamlessly integrates existing public and private infrastructures. Furthermore, a service hub is created with interdependent services that support the digital transformation of paper-based processes, such as verification and software update.Exemplary, these two central use cases are introduced, and its requirements and implementation approach are described. The main goal is to provide the same level of trust and security, by developing new digital concepts, infrastructure and remote processes for a unified digital single market.

No abstract

No abstract