Manage a decentralized identity across devices by giving each device its own key and defining how devices are enrolled, authorized, rotated, recovered, and removed. A DID document can describe public verification methods and their purposes, but DID Core does not define a universal device-enrollment protocol or guarantee that a revocation reaches every verifier immediately. In practice, “instant revocation” is a goal bounded by the DID method, update propagation, resolver availability, and each verifier’s freshness policy.
What multi-device identity means in a DID system
A decentralized identifier (DID) is controlled through cryptographic methods rather than necessarily through a centralized identity provider. A DID document can list verification methods, such as public keys, and associate them with relationships such as authentication or authorization. DID Core 1.0, a W3C Recommendation published on 19 July 2022, defines these concepts, DID document operations, and resolution; it does not prescribe one protocol for enrolling phones, laptops, or other devices.
A practical design choice is to create a device-specific key pair for each enrolled device. Each device proves control of its own private key, while the identity’s governing rules authorize which keys belong in the DID document and what each key may do. This is not a requirement of DID Core. The 2024 ELEKTRA paper uses a one-to-one relationship between devices and key pairs in its model, with each device holding its secret key and a server holding and distributing associated public-key information. Its device-addition design requires authorization from both an existing device and the joining device; those are properties of that design, not universal rules.
Separate three roles when modeling authority:
- Authentication: proving control of an enrolled key for an authentication action.
- Authorization: permitting a controller or designated authority to change identity state, such as adding or removing a verification method.
- Recovery: restoring the ability to make valid identity changes after ordinary control is lost.
DID Core distinguishes authentication from controller authorization. Keeping these roles explicit matters: a compromised authentication key should not automatically gain every power needed to enroll replacements or defeat recovery controls.
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Choose the key-custody model before designing enrollment
Device-specific keys and synchronized keys solve different operational problems. The right choice depends on the threat model, recovery needs, device security, and whether users must continue working when a device is lost or offline.
| Model | Key custody | Operational benefit | Trade-off to account for |
|---|---|---|---|
| Per-device, non-exportable key | Each device keeps its own private key; the secret is not copied to other devices. | A lost device can be removed without replacing the identity’s keys on every other device. | Users need an enrollment and recovery path when no already-authorized device is available. |
| Syncable authentication key | Key material is synchronized or recovered through a sync fabric, according to that system’s design. | Access can continue across devices without separately enrolling a distinct key on each one. | The sync fabric and its access controls become part of the key-custody and recovery analysis. |
| One private key copied across devices | Multiple devices possess the same secret. | It avoids maintaining a separate key per device. | Compromise or removal is harder to isolate to one device because the shared secret represents all devices holding it. |
NIST SP 800-63B provides requirements for the covered context of syncable authentication keys; these should not be treated as universal DID protocol rules. For those authenticators, private-key operations must occur on the local device using keys generated there or recovered from the sync fabric. Synced keys must be encrypted, access controlled so only the authenticated user can access them, and protected by AAL2-equivalent MFA. The guidance also calls for a user interface showing which services have syncable keys and whether and where they have synced, without exposing the keys themselves.
These requirements offer a useful baseline for evaluating a syncable authenticator, not a blanket certification of a DID key design. NIST SP 800-63-4 also discusses a user-controlled wallet federation model and a broader digital identity risk-management process.
Define enrollment as an authorized state change
Adding a device should not mean merely accepting a public key sent by a client. The system needs to establish that the joining device controls the proposed private key and that an authorized party approved the change. DID Core leaves the exact enrollment protocol to the DID method and application.
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- Generate the joining device’s key. Create the secret on that device when the chosen custody model permits. Keep key generation and storage separate from DID document editing.
- Prove possession. Require the joining device to sign a fresh challenge or otherwise prove control of the proposed key using a method appropriate to the protocol. The challenge format and protection against replay are application design requirements, not supplied by DID Core.
- Authorize enrollment. Check the proposed policy: for example, an existing authorized device, a recovery authority, or a quorum may approve the new method. The ELEKTRA paper’s dual-authorization model is one research design, not a universal requirement.
- Assign a purpose. Add the verification method under the relationship needed for its intended operation. Do not assume that every key should have authority to update identity state.
- Publish and verify the update. Apply the change through the DID method and confirm that the resulting state resolves as expected. The method determines how updates are authenticated and made visible.
- Make device state inspectable. Give users a way to identify enrolled devices and remove ones they no longer trust. A DID document expresses verification methods and relationships; a device label or friendly inventory is an application-level usability feature.
Keep rotation, revocation, and recovery distinct
Rotation replaces a key proactively
Rotation introduces a replacement verification method and deactivates or destroys the old secret material. DID Core describes rotation as proactive and says regular rotation is generally considered best practice, while warning that frequent rotation can require relying parties to renew or refresh related credentials. Not all DID methods support rotation, so the capability must be checked for the method in use.
In a multi-device system, rotating one device’s key should be modeled as a change to that device’s authorization state, not as an undocumented overwrite of a shared secret. The application should establish which authority approves the replacement and how any credentials or relying parties connected to the old method are handled.
Revocation responds to suspected compromise
Revocation removes or deactivates a compromised verification method so that future proofs using it should no longer be accepted under the current identity state. DID Core says a controller is expected to revoke a known compromised method immediately, but revocation is represented by changes to the latest DID document, and not all DID methods support it.
There is therefore an important difference between submitting a revocation update and every verifier rejecting the key. The latter depends on whether the DID method accepts and propagates the update, whether resolvers are available, how long verifiers cache state, and how fresh their verification policy requires that state to be. An offline verifier or a verifier using stale cached state cannot be assumed to see a new revocation.
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Recovery restores control when ordinary authority is unavailable
Recovery is the process for regaining the ability to make identity changes after losing a device or otherwise being unable to perform DID operations. DID Core says, “There are currently no common recovery mechanisms that apply to all DID methods.” A method may use a trusted-party quorum, a time lock, or another mechanism, but those are method-specific choices rather than interchangeable defaults.
DID Core recommends not reusing recovery cryptographic material for other purposes and discusses recovery alongside rotation and revocation. Isolate recovery authority from routine authentication where possible: otherwise, the credential intended to rescue an identity can become another everyday key whose compromise defeats the intended separation of roles.
Specify what “instant revocation” means for verifiers
No single update can make a universal immediate-rejection guarantee across every DID method, resolver, and verifier. Define the service-level meaning of “instant” in terms of the system’s publication and verification path rather than presenting it as a property of DID Core.
- Update acceptance: how the method reports that a controller-authorized change was accepted.
- Resolution: how a verifier obtains current DID state, and what it does if the method or resolver is unavailable.
- Freshness: the maximum age of cached state a verifier will accept, and whether the verifier can check for updates during a transaction.
- Offline behavior: whether verification fails closed, uses previously obtained state, or follows another explicit policy when current state cannot be fetched.
- Visibility: what the controller and user can observe about update status and what a relying party can infer from device changes.
These choices involve both security and availability. Checking current state can reduce the window in which a revoked key remains usable, but it makes verification more dependent on lookup infrastructure. Caching supports verification during outages but creates a period in which a verifier may not know about a new update. The DID method, resolver behavior, cache policy, and verifier’s risk tolerance must therefore be considered together.
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Separate current-state rejection from historical signature review
Revoking a key does not automatically undo a signature made earlier. To assess a past proof, a verifier needs trustworthy evidence about the DID state at the relevant time and a reliable way to associate the signed event with that time or state version.
DID Core explains that when a method can retrieve historical DID state and the signature can be tied reliably to a time or version, revocation need not invalidate a statement made before revocation. If historical state cannot be retrieved or the signing time cannot be trusted, a verifier may need to evaluate the proof using current state instead. A signature’s own timestamp is not automatically independent evidence of when it was created.
Before relying on historical validity, establish whether the DID method preserves prior versions, what version metadata can be verified, and what trusted time evidence accompanies the signed event. Without those properties, a system should not promise that it can reliably distinguish a pre-revocation signature from a post-compromise one.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Model identity lifecycle independently from cryptographic primitives in Rust
DID Core does not require Rust, Ed25519, or any particular cryptographic crate. Rust can be used to implement the application’s state transitions and cryptographic operations, but the protocol and method determine which representations, algorithms, and update rules are valid. The official Rust book covers language fundamentals; the ed25519-dalek documentation describes an Ed25519 API that may be relevant only if that scheme fits the chosen design. Neither source establishes that a particular implementation is suitable or has been evaluated for a given system.
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Keep lifecycle policy separate from primitive key operations. A maintainable design should make enrollment, authorization, rotation, recovery, and revocation explicit state transitions; keep serialization and signature verification reviewable; and define how resolver freshness and failures affect decisions. This is an engineering approach, not a tested Rust implementation or a claim about a particular crate’s security.
One useful design artifact is a transition table maintained alongside the implementation:
| Transition | Question the implementation must answer | Evidence to retain or verify |
|---|---|---|
| Enroll device | Who approved the method, and did the joining device prove possession? | Authorization outcome, proof-verification result, and the resulting DID state. |
| Rotate key | Which authority approved the replacement, and how is the former method deactivated? | Old and new method identifiers and the published state change. |
| Recover control | Which method-specific recovery rule was satisfied? | Recovery authorization and the resulting update, without reusing recovery material for other purposes. |
| Revoke key | Was the change accepted, and what freshness policy will verifiers apply? | Published revocation state and the verifier’s current-state or historical-state basis. |
Review each transition for failed updates, unavailable resolvers, stale state, unauthorized requests, and recovery paths that could be abused. Keep any user-facing device inventory consistent with the identity state users and verifiers actually rely on.
Compare DID methods against the system’s requirements
DID Core standardizes concepts, not uniform operational behavior. A method comparison should document its answers to the following questions rather than assuming that a DID document alone settles them:
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- Key custody: are secrets local-only, held in secure hardware, or synchronized or exported? Which methods are used for authentication versus identity-state authorization?
- Recovery authority: is recovery self-held, delegated to a quorum, delayed by a time lock, or handled another way? Is that authority isolated from routine use?
- Revocation visibility: how are updates propagated, how do resolvers behave, what may be cached, and what happens when a verifier is offline?
- Historical verification: can previous document versions be resolved, and can a signature be tied to an independently reliable time?
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The W3C DID Core v1.1 editor’s draft, accessed on 4 October 2026, repeats that no shared recovery mechanism applies to every DID method. It is a mutable draft, so it should not be treated as a final replacement for the published v1.0 Recommendation.
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