Making Electronic Data More available for Research and Public Health (MedMorph)
1.0.0 - STU 1

Making Electronic Data More available for Research and Public Health (MedMorph), published by HL7 International - Public Health Work Group. This is not an authorized publication; it is the continuous build for version 1.0.0). This version is based on the current content of https://github.com/HL7/fhir-medmorph/ and changes regularly. See the Directory of published versions

## Trust Services

This section defines the specific requirements for a Trust Service Provider as specified in this MedMorph Reference Architecture (RA) Implementation Guide (IG). In order to better understand the trust services, readers can refer to the following documentation.

- HHS Guidance on De-Identification

- IHE IT Infrastructure Handbook on De-Identification. This includes literature on de-identification, pseudonymization and re-linking.

- National Institute of Standards and Technology (NIST), Secure Hashing website

- NIST Documentation on de-identify and re-identify

- Additional information on trust services from CDC.

### Trust Service Provider Requirements

A Trust Service Provider enables trust services such as anonymization, de-identification, re-identification, hashing, and pseudonymization. These services are used when required (e.g., to de-identify data sent to research organizations).

The next section identifies specific requirements for a Trust Service Provider:

- Trust Service Provider SHALL support the APIs defined by the Trust Service Provider Capability Statement.

- Trust Service Providers SHALL allow re-identification of bundles that were previously de-identified.

- Trust Service Providers SHOULD implement algorithms specified by the content IGs for the different use cases. Trust Service Provider MAY choose their own anonymization, de-identification, re-identification, hashing and pseudonymization algorithms in case none are specified in the content IGs.

- Trust Service Providers MAY ignore extensions on data elements when they are not understood by the Trust Service Provider.

- Content IGs will identify specific data elements within resources that need to be processed by Trust Services based on the use case.