Scientific data security is not only an inherent requirement for the development of scientific data management theory, but also a practical need for the development of scientific data. In the field of metrology, with the development of metrology digital transformation, reliable requirements have been put forward for data security in metrology science based on the universal significance of data security. The development strategy CIPM2030+formulated by the International Bureau of Weights and Measures (BIPM) proposes to achieve "remote+X" in the digital transformation of metrology, and its services still focus on metrology scientific data. Therefore, in "remote+X" measurement, the authority of measurement in the physical world is transformed into the credibility of scientific measurement data in the digital world. This article proposes three methods to establish the credibility of metrological data, namely, the anti-repudiation and identity trustworthiness of the data generation subject, the anti-tampering and traceability of the data transmission process, and provides corresponding implementation technical suggestions. It also specifically introduces the data security system design of the National Institute of Metrology in achieving the credibility of metrological data. Through these studies, we will gradually establish a trustworthy system for metrological scientific data, and build a trustworthy foundation for the secure application of metrological scientific data and the digital transformation of metrology.