What is federated identity?

Federated identity is a framework for managing digital identities across multiple organizations, allowing users to securely access resources from different systems using a single set of credentials. In a federated identity system, users authenticate with their home organization, and that authentication is then shared with other trusted partners or service providers, granting the user access to the resources they need without having to create and manage separate logins for each service.

How does federated identity work?

The foundation of federated identity is a trust relationship established between organizations that are part of the federation. This trust is established through a set of technical, operational, and legal agreements that define how identities will be managed, authenticated, and shared. At the technical level, federated identity systems use standardized protocols such as SAML (Security Assertion Markup Language), OpenID Connect, or WS-Federation to securely exchange user authentication and authorization information between the identity provider (the user's home organization) and the service provider (the application or resource the user is accessing).

When a user attempts to access a service that is part of the federated identity system, they are redirected to their home organization's identity provider to authenticate. The identity provider verifies the user's credentials and generates a security token that is then sent to the service provider. The service provider can then use this token to verify the user's identity and grant them access to the requested resources, all without the user having to enter their credentials directly on the service provider's site.

Key components of federated identity

Identity provider (IdP): The organization that is responsible for managing user identities and authenticating users. The IdP generates security tokens that are used to assert the user's identity to service providers.
Service provider (SP): The organization or application that provides the resources or services the user is trying to access. The SP relies on the IdP to authenticate the user and grants access based on the security token provided.
Trust framework: The set of technical, operational, and legal agreements that define how identities are managed and shared between the organizations in the federation.
Federated protocols: The standardized protocols, such as SAML, OpenID Connect, or WS-Federation, used to securely exchange authentication and authorization information between the IdP and SP.

Benefits of federated identity

Federated identity offers several benefits for both users and organizations:

Improved user experience: Users only need to remember a single set of credentials to access multiple services, reducing the burden of managing multiple passwords.
Increased security: Federated identity systems leverage strong authentication methods and centralized identity management, reducing the risk of password-related security breaches.
Scalability and flexibility: Organizations can easily add new service providers or identity providers to the federation, expanding the range of resources available to users without the need to create and manage additional accounts.
Cost savings: Federated identity can help organizations reduce the IT overhead associated with managing user accounts and passwords for multiple applications and services.

Common use cases for federated identity

Federated identity is widely used in various industries and scenarios, including:

Enterprise collaboration: Allowing employees to access cloud-based applications and services (e.g., Microsoft 365, Google Workspace) using their corporate credentials.
Higher education: Enabling students, faculty, and staff to access campus resources and services (e.g., learning management systems, library databases) using their university credentials.
Healthcare: Allowing patients to access their medical records and other healthcare services using their personal or government-issued credentials.
Government services: Providing citizens with a single sign-on experience to access various government portals and online services.
B2B partnerships: Facilitating secure access to shared resources and applications between business partners.

Best practices and considerations

When implementing a federated identity system, it's important to consider the following best practices and important factors:

Establish trust and governance: Develop a clear governance framework and trust agreements between the participating organizations to ensure consistent policies, security standards, and operational practices.
Ensure data privacy and compliance: Comply with applicable data protection regulations and implement appropriate security controls to protect user data and privacy.
Implement strong authentication: Leverage multi-factor authentication or other advanced authentication methods to enhance the security of the federated identity system.
Monitor and maintain the system: Regularly review and update the federated identity system to address changes in technology, security threats, and user requirements.
Provide user education and support: Educate users on the benefits and use of the federated identity system, and offer support resources to ensure a smooth user experience.

Real-world example

One example of a successful federated identity implementation is the Education Superhighway, a non-profit organization that helps K-12 schools and districts in the United States connect to high-speed internet. The Education Superhighway has established a federated identity system that allows teachers, administrators, and students to access a wide range of educational resources and services using their school or district credentials. This federated approach has enabled the organization to streamline access to these resources, improve user experience, and enhance the overall security of the system.

What is federated identity?