Federation Trust Registry

Full Title or Meme

Wherever a Web Sites wishes to take advantage of the benefits of belonging to a Federation it needs to be exposed in a Data Service that allows any user to ensure that the Web Site has been Validated by the Federation, or, at the very least, subscribed to the federation's principles.

Context

• While an early Federation Trust Registry would likely just list federation members and provide a logo to display on the member's site, now a Trust Registry is expected to provide a service API that can respond to requests about members with an Entity Statement.
• As more and more governments and organization start to talk about building a Trust Registry<rev>Digital Identity Laboratory, Trust Registry Canadian Internet Registration Authority (CIRA) https://www.idlab.org/wp-content/uploads/2022/06/Executive-Summary-CIRA-Trust-Registry.pdf</ref> the more it becomes clear that Federation now means no more, and no less, than an application level Identifier trust ecosystem.

Several variations on the theme of a Federation Trust Registry exist already. But it must be noted that the only function that a federation needs to perform is the creation and administration of the rules for registering an entity with the Trust Registry.

• Trust Services of TSCP the Transglobal Secure Collaboration Program (mostly focused on NATO A&D industry).
• UK Open Banking (focused on UK banks and payment processors) Trust Registry is run by the FCA.
• Recognized Coordinating Entity (RCE) (focused on the US Health Care community.) See the page on TEFCA.

When a US federal agency's mission requires that it disseminate controlled unclassified information (CUI) to non-executive branch entities, but prohibits it from entering into a contractual arrangement, the agency is nevertheless directed to seek the entity's protection of CUI in accordance with Executive Order 13556, Controlled Unclassified Information, or any successor order, and the CUI Program regulations, which include requirements to comply with NIST SP 800-171.

Standards must be implemented, potentially with a profile, to ensure that the result is "as consistently as possible, follows implementation guides and authoritative best practices published by the applicable standards development organization (SDO). Minimizing variation in how standards are implemented will make it easier for others to connect to Electronic Health Information. Further, to the extent possible, Electronic Health Information stored in health IT products should be structured and coded using standardized vocabularies."

Problem

• Users and participants in an Identity Federation need to understand in real-time whether any particular web site is conformant with federation rules. Or, in other words, the user must be aware of the rules that apply to their current activity.
• So far, every solution has been one-off and not applicable to the next federation with the same general problem.
• Most user's experience with Internet Security is sub-optimal or worse. Trust Registries might be able to address at least some of the security challenges.
• More and more protocols developers have realized that they need Trust Registries without understanding that trust cannot be measured without the policies that have here-to-fore been generated by the federation. In other words, the rule set must exist before trust can be quantified in a registry. Unfortunately, those developers and architects have started to build the registries before the rules are in place. This is worse than a waste of time, it creates a format for registries before we understand what data needs to be in those registries.

Is it Trustworthy

• There are schemes afoot across the globe by governments and organizations like Trust over IP. Evidence in 2022 is that the registries are not, in fact, trustworthy.

Regulation and Liability

Just like Identifier or Attribute Providers, any site that provides trust metadata could be liable if the recommendations turn out to be misleading and the user suffers a loss as a result.

One way to avoid Liability is for a sovereign state to require that some trust Registry must be accepted. The major problem with that is that means that security of the web would move at the speed of regulation, which is insufficient to keep the web secure. While the particular problem described by Vint Cerf may not survive into EU law, the propensity of legislatures to mess with user's trust will surely continue to compromise the security of online commerce. See the wiki page "GDPR is a scam" for more examples.

Solution

There will be a Nationwide, or Global, registry of all compliant federations. That is able to answer queries about whether any Web Site is currently compliant. Queries can have specific site Identifiers or any character sting that will return a list of participants that meet the query. This services is specifically designed to be user friendly. This implies some sort of standard way to create a Trust Registry Identifier that can be photographically bound each Trust Registry.

In order that a Federation can be expose both is principles and its membership to the public some data server needs to provide information about the existing membership and their status. There are two ways to do this:

1. A list of the members and their status that can be viewed in a browser.
2. A data service that exposes the contents of the site in machine readable format.

This page is about the later case.

Of primary importance for a Federation that wants to allow user's to trust the members, is some easily accessible data service on a site that meets the following criteria

1. Reliable, always-on accessibility.
2. Meta-data descriptions of the contents of any federated Web Site.
3. Machine readable data as well as meta-data (called Service-Enabled Data Store).
4. Data Security
5. Contains no User Information and does not track the user, but is expected to respond Anonymously to User queries.

Federation Profile

Each federation will need to create their own set of specifications for determining those Web Sites and Subjects that may be registered. While that could be an independent effort, this page address those federations that define a Framework Profile of the IDEF registry. Only with a single rooted tree of registries can the user be sure of the source of trust. It is possible for the federation to break the Framework Profile into separate documents for security, privacy and interoperability as UK Open Banking did.

Each federation will support one or more Federation APIs that will enable any communicating Entities on the web to query the current status of each member. The Federation API page describes different sets of goals that depend on the purposes of the api, either technical or experiential.

Use Cases

• Federated Strong Employee ID

Working Sample Site

The work product can be viewed at this site. The Kantara demo registry can be viewed at this site. It is currently focused on Healthcare apps.

Accreditation Services

For high assurance Trust Registries, some sort of Accreditation Service is required to evaluate the members to assurance compliance.

Fraunhofer

• EESIF Fraunhofer TRAIN project

  Our component aims to extend the ESSIF-Framework through a global trust infrastructure that can be used to verify the trustworthiness of involved parties in an electronic transaction. The trust layer enables actors using the ESSIF-Framework to verify the root of trust of certificates used to sign credentials. In addition, the component allows for the definition, consideration, and verification of Trust Schemes compliance (e.g. eIDAS including LoAs or other Trust Schemes that can also be application/industry-specific) of involved parties. It is not dependent on a hierarchical CA infrastructure.

• EESIF open call
• eSSIF-Lab Framework

Check out this link to a sample TRAIN Trust List , Isaac has provided: The trust-list can be found at the following link https://tspa.trust-scheme.de/tspa_train_domain/api/v1/scheme/test1-ehic-scheme.vc.train.trust-scheme.de.

Canada

Here is the line that seems to mean that holders are included in the Canadian Trust Registry. It could be that the line is poorly worded, but it seems to include holders in the process. "Digital Identity Ecosystems and their associated Trust Registries use a Trust Framework (such as the PCTF) to define how Issuers, Verifiers, Holders, and Digital Wallets should or must operate to be considered trustworthy." https://diacc.ca/trust-framework-components/pctf-trust-registries/

Example Data Elements

The following is extracted from a representative collection of existing Trust Registries. Including those at the GCCN registry page.

Element Name	OIDC	mdl	description
issuer	iss	VI	entity identifier of the issuer of the statement. If the iss and the sub are identical, the issuer is making a statement about itself.
Roles			Need a formal taxonomy, e,g, Federation Trust Authority
jurisdiction			Laws that apply, e.g. us-WA
Basis of trust			Laws or other governance
subject	sub	DN	The entity identifier of the subject
subjurl	sub	DN	The URL of the subject, could be.a did or the common name from a cert
start date	iat	nbf	The time the statement was issued
end date	exp	naf	The date/time the statement expires.
public key	jwks	cert	the public part of the subject entity's signing keys.
recipient	aud	??	audience
metadata	metadata	??	metadata
policy	metadata_policy	??	policy
trust anchor	trust_anchor_id	??	entity id
logos	trust_mark	??	These logos can be displayed on the provider's web sites to allow informed user choice

Submittter Data Elements

The following is extracted from a representative collection of existing Trust Registries.

nam|| iss||VI|| || e.g. submitter.corp.com address|| |||| in the standard format name, strte, city, provide, country, potal code

Element Name	OIDC	mdl	description
mail			Need a formal taxonomy, e,g, user@example.com
jurisdiction			Laws that apply, e.g. us-WA
subjurl	sub	DN	The URL of the submitter, could be.a did or the common name from a cert (optional)
public key	jwks	cert	the public part of the subject entity's signing keys. (Optional)
metadata	metadata	??	for example, president of company, etc.
trust anchor	trust_anchor_id	??	entity id

References

External Sources

• Kantara Initiative Federation Operators Guidelines
• OAuth 2.0 Dynamic Client Registration Protocol RFC 7591
• Email thread that suggests use of software statements to provide federation.
• Application Bridging for Federated Access Beyond Web (ABFAB) Use Cases RFC 7832.
• Shibboleth Metadata refers to configuration data used to provision an SP or IdP to communicate with each other. Typically, it exists in XML form, at least for publishing and interchange.