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Clear out junk files and repair common Windows errorsFree Scan →Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →The Identity Bridge Framework is a proposed way to let someone who has signed in to a native mobile app open a partner website without signing in again. It uses a separate Bridge service to carry a carefully controlled authentication handoff into the central identity provider (IDP), which then establishes the website session. It is an architecture pattern—not a built-in OIDC feature or a universal standard—and its prototype uses Okta as the central IDP.
Why native-to-web single sign-on needs a bridge
Web single sign-on (SSO) commonly relies on a browser session cookie set by an identity provider. A native mobile app and the system browser are separate security domains: the app cannot simply share its IDP cookie with the browser. As a result, a person already signed in on a phone may still be asked to authenticate when a link opens a partner website.
Identity Bridge addresses that boundary with a token-mediated handoff. The mobile app supplies an authentication token to the web sign-in flow, and a separate service validates it through a federation relationship with the central IDP. The IDP—not the mobile app—then completes the website’s OIDC sign-in and creates its session.
How the Identity Bridge flow works
- Authenticate in the native app. The user signs in through the central IDP, which issues an authentication token. The working prototype described by Indranil Jha uses an OIDC ID token.
- Start the web handoff. The user taps a link in the app. In the described design, the link carries the mobile token as a parameter to the web app.
- Begin OIDC at the website. The web app initiates its normal OIDC sign-in with the central IDP and supplies the received token as
login_hint. - Delegate to the Bridge. The central IDP uses its inbound-federation capability to delegate authentication to the Bridge service, which behaves as an OIDC identity provider to that central IDP.
- Validate and create an assertion. The Bridge validates the mobile token, creates a temporary authorization response, and returns a signed JWT through its
/tokenendpoint. The JWT includes the OIDC nonce. - Verify and establish the session. The central IDP verifies the JWT using the Bridge’s published public key, then completes the OIDC flow and creates the web session.
This is a federated assertion chain: the Bridge validates the mobile-side credential, while the central IDP consumes a signed assertion from a configured federation partner. The central IDP remains the party that issues or establishes the session for the web app.
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What the Bridge service has to provide
The prototype exposes three endpoints. Their names describe roles in the federation flow; they do not by themselves make the service a complete, secure identity provider.
| Endpoint | Role in the prototype |
|---|---|
/authorize |
Receives the central IDP’s authorization request as part of delegation to the Bridge. |
/token |
Validates the mobile token and returns a signed JWT used as the temporary authorization response. |
/keys |
Publishes the Bridge’s ephemeral public key so the central IDP can verify the signed assertion. |
The Bridge needs to preserve the OIDC request context, including the nonce, and use a signing key the central IDP can verify. The described prototype creates an ephemeral key pair and publishes the public key. The central IDP must be configured to trust the Bridge and validate its assertion; simply exposing these routes is not enough to establish that trust.
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Security controls that matter most
The handoff is security-sensitive because possession of the mobile authentication token may let someone start a web authentication. A token that is stolen or replayed can therefore turn a mobile credential leak into web-session access. The design should treat the link and token as credentials, not as harmless navigation data.
Use a handoff-specific, short-lived token
Do not reuse a long-lived mobile token for the browser handoff. The recommended pattern is to obtain a separately scoped, ultra-short-lived token just before opening the website. Limit what it can authorize and how long it remains useful. The source does not establish a specific lifetime or scope value, so these must be set according to the IDP’s capabilities and the application’s threat model.
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Use an ephemeral signing key pair for the handoff and discard it after the operation succeeds or fails, as described for the prototype. The central IDP should accept only the expected Bridge assertion, verify its signature and request binding, and reject expired, replayed, or mismatched assertions. The nonce must correspond to the OIDC request that initiated the flow; it is not decorative metadata.
Protect the link and validate the OIDC transaction
Putting a bearer-like credential in a URL parameter can expose it to places that handle URLs, such as application or proxy logs, browser history, analytics, and referrer data. Minimize exposure: avoid logging the token, keep it out of durable links, use HTTPS throughout, and ensure the web app consumes it only for the intended handoff. Preserve normal OIDC state, nonce, and redirect-URI validation rather than treating the mobile token as a substitute for transaction checks.
Restrict who can call the Bridge
The described controls include accepting requests only from IP addresses allow-listed for the central IDP. Treat this as an additional network restriction, not a replacement for cryptographic validation and request checks. The Bridge is a new production service to operate, monitor, patch, and secure; compromise of it or its configuration can undermine the federation path.
How this relates to native-app OAuth and OIDC guidance
RFC 8252, IETF BCP 212, says OAuth authorization requests from native apps should use external user-agents, primarily the user’s browser. It treats the browser as a separate security domain and explains that browser-held authentication state can enable SSO. It also requires public native clients to implement PKCE.
Identity Bridge does not replace those requirements. It addresses a different problem: carrying an authenticated state from the native app into a web application when the browser cannot share the app’s IDP cookie. Native clients should still use the browser-based authorization flow and PKCE where applicable; the Bridge is an additional federated handoff, not a reason to weaken the native app’s OAuth flow.
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The pattern may be relevant where a mobile app frequently sends authenticated users to a separately operated or partner web property: corporate portals, travel apps linking to airline or hotel sites, healthcare apps linking to patient portals, streaming or commerce apps opening web account management, and B2B vendor portals.
Evaluate the available approach against the actual integration rather than assuming the Bridge is automatically preferable:
| Approach | Security exposure | Token lifetime and scope | Interoperability | Operational complexity | User friction |
|---|---|---|---|---|---|
| Use existing browser SSO | Relies on the browser’s existing IDP session; it does not transfer a mobile token. | No mobile handoff token is needed for the described cookie-based session path. | Uses the IDP’s existing browser session behavior. | Lowest where the needed browser session is already available. | Can be low if the browser is already signed in; otherwise the user may need to authenticate. |
| Identity Bridge with a dedicated handoff token | Adds a token handoff and a Bridge service; theft or replay is a concern, mitigated by short lifetime, narrow scope, validation, and key controls. | Should use a separately scoped, ultra-short-lived token; no exact lifetime is established. | Depends on central-IDP inbound federation and the Bridge’s OIDC-compatible assertion behavior; the described working prototype uses Okta. | Requires deploying and maintaining a proxy-like federation service, keys, endpoint configuration, and allow-list controls. | Designed to avoid another sign-in when the handoff succeeds. |
| Reuse a long-lived mobile token in the handoff | Higher exposure: a leaked or replayed authentication token could permit web authentication. | Reuses a token whose lifetime and scope may exceed what a one-time handoff needs. | Depends on the same IDP and federation integration as the Bridge design. | Still requires the Bridge and federation setup, without the recommended token minimization. | May avoid a second sign-in, but does so with an avoidable credential risk. |
Identity Bridge is most defensible when the user experience requires cross-boundary continuity, the IDP supports the necessary inbound federation, and the organization can operate the added service and tightly control handoff credentials. If a normal browser IDP session already serves the use case, adding a Bridge may introduce complexity without solving a remaining problem.
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What is established about the framework
The described framework is set out in Indranil Jha’s DZone article, published April 9, 2025, with a working prototype using Okta. That establishes a proposed design and prototype context; it does not establish broad adoption or measured production outcomes. No independent adoption, conversion, latency, breach-rate, or success-rate figure is established here, so the architecture should be evaluated as a design pattern rather than as a proven performance improvement.
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