---
url: 'https://www.corbado.com/blog/digital-identity-guide'
title: 'Digital Identity 101: A Beginner’s Guide for 2026'
description: 'Explore how digital online identities are created, managed, and secured – from traditional IDs to self-sovereign identity and verifiable credentials.'
lang: 'en'
author: 'Alex'
date: '2025-08-18T03:05:11.866Z'
lastModified: '2026-08-28T15:31:54.294Z'
keywords: 'digital identity, identity management, centralized identity, trusted identity, self sovereign identity, decentralized identity, identity verification, digital ID, identity proofing,  decentralized identifiers'
category: 'Authentication'
---

# Digital Identity 101: A Beginner’s Guide for 2026

## Key Facts

- Digital identity spans three models: **centralized** (authority-controlled), **trusted**
  (standards-based and verifiable) and **self-sovereign** (user-owned), each differing in
  credential issuance, storage and control.
- The **digital identity market** was valued at USD 47 billion in 2025 and is projected to
  more than quadruple by the mid-2030s, with Asia-Pacific seeing the fastest growth.
- **Centralized identity systems** create a single point of failure: the Equifax (2017)
  and Capital One (2019) breaches each compromised millions of identities from one
  repository.
- **Self-Sovereign Identity (SSI)** stores cryptographically signed Verifiable Credentials
  in user-controlled wallets, enabling selective disclosure of attributes without
  contacting the issuer or any central authority.

## 1. Introduction

The digital identity market is undergoing rapid transformation, driven by technological
innovation, rising cybersecurity demands, and evolving regulatory frameworks. Valued at
roughly USD 47 billion in 2025, the global market is projected to more than quadruple by
the mid-2030s, with North America leading adoption and Asia-Pacific seeing the fastest
growth. Organizations worldwide are embracing digital identity to enhance security,
streamline user experiences, and meet compliance requirements, as consumers increasingly
expect privacy-preserving, convenient, and trusted online interactions.

In the following blog we will answer the most important questions associated with the
digital identity space:

- What are the main models of digital identity (Centralized Digital Identity, Trusted
  Digital Identity, and Self-Sovereign Identity) and how do they differ?

- What challenges do traditional centralized identity systems face?

- How do emerging models like trusted digital identity and SSI address these challenges?

## 2. What is a digital Identity?

A digital identity is the collection of information and attributes that uniquely describe
a person, organization, or device in the online world. It serves as the online
“representation” of a real-world entity and is used to authenticate, authorize, and
interact in digital environments, similar to how an ID card or business registration works
in the physical world.

Digital identity is typically built from data points provided directly by the individual
or organization (self-asserted) and from verified sources (trusted third parties,
[government](https://www.corbado.com/passkeys-for-public-sector) agencies, service providers).

- **For individuals:** A digital identity enables you to log into accounts, prove who you
  are, and access personalized services.

- **For organizations:** It allows companies to interact in digital ecosystems—such as
  signing contracts electronically, operating secure portals, and managing brand presence.

| **Digital Identity Element**  | **Examples**                                                                                     |
| ----------------------------- | ------------------------------------------------------------------------------------------------ |
| Usernames & Login Credentials | `jane_doe92`, `@TechBankSupport`                                                                 |
| Online Profiles               | LinkedIn profile, company “About Us” page, GitHub account                                        |
| Digital IDs & Certificates    | Estonia e-Residency ID, Aadhaar number, X.509 digital certificate, mobile driver’s license (mDL) |
| Biometric Identifiers         | Fingerprints, facial recognition template, voice recognition pattern                             |
| Activity & Behavioral Data    | Purchase history, location metadata, device fingerprint                                          |

## 3. Centralized digital Identity

The dominant model for managing digital identities has historically been **centralized
identity management**, in which a single authority creates, stores, and governs
credentials. This structure delivered efficiency and control in earlier computing
environments, but its design assumptions are increasingly challenged by modern security,
privacy, and interoperability requirements.

### 3.1 Background on traditional centralized Identity Management Systems

Centralized identity management has long been the default way organizations and
[governments](https://www.corbado.com/passkeys-for-public-sector) control digital identities and access.
Originating in the 1960s with simple password files, it matured into directory-based
platforms where a single authority (typically IT or an identity provider) manages
identities, credentials, roles, and permissions in one place.

As networked computing grew, these centralized systems became the practical way to govern
who could access which systems and data. Their history, function, and emerging limits will
help explain why the identity landscape is shifting toward new models.

### 3.2 What Problems do traditional centralized digital Identity Systems have?

While the approach of a centralized digital identity system can simplify setup and
administration, it also creates structural weaknesses that impact **security, privacy,
compliance, user autonomy, and accessibility**. The following are key challenges and risks
associated with centralized identity management.

#### 3.2.1 Single Point of Failure

Centralizing user credentials and personal data in one repository concentrates risk. If
that central database is breached, millions of identities can be compromised in a single
incident. High-profile cases like the Equifax (2017) and Capital One (2019) breaches
demonstrate how attackers can [exploit](https://www.corbado.com/glossary/exploit) such a setup to access
sensitive information like names, Social Security numbers, addresses etc. on a massive
scale. Also even without a breach, outages at the identity provider can instantly cut off
access to all connected services.

#### 3.2.2 Privacy Risks

Centralized identity models typically give the operator full control over how personal
data is stored, processed, and shared. Users have limited visibility into where their data
goes, who accesses it, and for what purpose leading to:

- Overcollection of data far beyond what’s needed for a specific transaction.

- Data misuse or unauthorized sharing with advertisers, partners, or
  [government](https://www.corbado.com/passkeys-for-public-sector) agencies.

- Increased exposure to surveillance or profiling.

#### 3.2.3 Fragmentation and Lack of User Control

While each organization keeps its own user directory, individuals don’t actually “own”
their identifiers (e.g., email address, username, account number). These can be revoked,
changed, or suspended at the provider’s discretion. Users also often need to create
separate accounts for each service, leading to fragmented profiles that are hard to
manage. Worse, to access even basic services, people may be forced to overshare personal
details, such as providing a full date of birth for a simple subscription.

#### 3.2.4 Compliance and regulatory Challenges

With privacy regulations (like for example GDPR in the EU), organizations must manage
consent, data minimization, and right-to-erasure requests. Centralized identity systems
often lack fine-grained access controls or automated data lifecycle management, making it
difficult to comply. The centralization of data also creates bottlenecks for fulfilling
Data Subject Access Requests (DSARs), as every request may require manual review of all
stored records.

#### 3.2.5 Password Fatigue and Authentication Issues

Traditional centralized identity almost always relies on usernames and passwords. Across
dozens of accounts, users tend to:

- Reuse passwords

- Choose weak, easy-to-remember credentials

- Fall victim to [phishing](https://www.corbado.com/glossary/phishing) and
  [credential stuffing](https://www.corbado.com/glossary/credential-stuffing) attacks

This not only undermines security but also increases the operational cost of resetting and
recovering accounts.

## 4. Trusted digital Identity

As digital transactions have become more critical and high-risk, organizations
increasingly require identity systems that go beyond simple account management. This need
has led to the concept of **trusted digital identity**, a framework that provides
verifiable, standards-based assurance about who or what is on the other end of a
transaction.

### 4.1 What is trusted digital Identity?

Trusted digital identity is a **verifiable link between a real person (or org/device) and
digital credentials** that other parties can rely on with a known level of assurance.
“Trusted” means the identity was proven, is bound to strong cryptography, and is governed
by rules (policies, audits, certification) so relying parties know how much to trust it.

### 4.2 How does trusted digital Identity work?

#### 4.2.1 Identity proofing

**How it works:**

1. Collect minimum, strong evidence (e.g., passport/ID images or chip data).

2. Verify documents and MRZ/chip where available (ICAO 9303).

3. Cross-check with authoritative sources
   (bank/[KYC](https://www.corbado.com/blog/iso-18013-7-mdl-bank-kyc-onboarding),
   [government](https://www.corbado.com/passkeys-for-public-sector) registries).

4. Perform remote or in-person verification (video/live agent) with liveness checks.

5. Apply risk-based additional checks for higher-assurance or high-risk cases.

**Standards & assurance:** [NIST](https://www.corbado.com/blog/nist-passkeys) [IAL](https://www.corbado.com/glossary/ial) 1–3;
[eIDAS](https://www.corbado.com/glossary/eidas) assurance levels (Low / Substantial / High); applicable national
eID/AML requirements.

**Lifecycle:** Create a versioned proofing record at onboarding. Record when, how and with
what evidence proofing occurred; trigger re-proofing when identity attributes materially
change or after defined expiry.

**Security & privacy:** Collect only required evidence, encrypt stored proofing records,
use access controls and tamper-evident audit logs. Prefer pairwise/pseudonymous
identifiers to avoid cross-service correlation and apply retention policies to delete
unnecessary artefacts.

**Outputs:** Durable proofing record, unique (pseudonymous) subject identifier, assigned
[IAL](https://www.corbado.com/glossary/ial)/LoA, and audit trail of proofing events.

#### 4.2.2 Credential issuance & binding

**How it works:**

1. Generate a key pair in a [secure enclave](https://www.corbado.com/glossary/secure-enclave) or TPM for passkeys
   (FIDO/WebAuthn); register the public key with an
   [relying party](https://www.corbado.com/glossary/relying-party).

2. Issue [verifiable credentials](https://www.corbado.com/blog/eudi-wallet-2026-deadline-rollout-eic-2026) (W3C
   VC / ISO [mDoc](https://www.corbado.com/glossary/mdoc)) signed by an [issuer](https://www.corbado.com/glossary/issuer) and stored in
   a user [wallet](https://www.corbado.com/blog/digital-wallet-assurance) for selective disclosure.

3. Provision enterprise credentials or PKI certificates to smartcards/TPMs with PIN or
   biometric binding; support multi-device enrollment and recovery where required.

**Standards & assurance:** [FIDO2](https://www.corbado.com/glossary/fido2) / WebAuthn, W3C Verifiable
Credentials, [ISO 18013-5](https://www.corbado.com/glossary/iso-18013-5) (mDL), PKI best practices and
[attestation](https://www.corbado.com/glossary/attestation) profiles.

**Lifecycle:** Support enrollment, backup/recovery, key rotation/renewal and revocation.
Track credential provenance and versioning; schedule expiry and refresh per policy.

**Security & privacy:** Keep private keys confined to secure hardware/OS keystores;
require local unlock controls (PIN/biometric). Minimize attributes in credentials, protect
[attestation](https://www.corbado.com/glossary/attestation) metadata that can fingerprint users, and implement
revocation without unnecessary data exposure.

**Outputs:** Issued, cryptographically bound credential(s) (passkey, VC, certificate)
ready for authentication and selective disclosure.

#### 4.2.3 Authentication

**How it works:**

1. Verify possession/control via challenge–response (passkeys/WebAuthn) or signed
   [wallet](https://www.corbado.com/blog/digital-wallet-assurance) [assertions](https://www.corbado.com/glossary/assertion).

2. Apply [step-up authentication](https://www.corbado.com/glossary/step-up-authentication) (additional factors)
   for elevated-risk operations.

3. Bind the authentication to session context (origin, device) and produce an
   [assertion](https://www.corbado.com/glossary/assertion) for the [relying party](https://www.corbado.com/glossary/relying-party).

**Standards & assurance:** Map authentication methods to
[AAL](https://www.corbado.com/faq/authenticator-assurance-levels-aal-digital-identity) levels (e.g.,
[AAL2](https://www.corbado.com/blog/nist-passkeys)/[AAL3](https://www.corbado.com/blog/nist-passkeys)); follow WebAuthn and token best
practices for session binding and replay protection.

**Lifecycle:** Treat authentication as a session lifecycle: initial
[assertion](https://www.corbado.com/glossary/assertion), session binding and refresh, step-up when needed, and
defined termination/renewal. Log assurance changes (e.g., step-up events) for audit and
risk scoring.

**Security & privacy:** Use origin binding, anti-replay measures, short-lived tokens and
risk signals. Limit [authentication telemetry](https://www.corbado.com/blog/digital-identity-gap) to minimal,
pseudonymised metadata and apply throttling/abuse detection.

**Outputs:** Authenticated session [assertion](https://www.corbado.com/glossary/assertion) tied to user/device,
recorded assurance level, and audit/log entries for the authentication event.

#### 4.2.4 Claims & attribute release

**How it works:**

1. Release only the attributes required by the [relying party](https://www.corbado.com/glossary/relying-party)
   (scopes → claims via OIDC/SAML).

2. Use selective disclosure techniques (SD-JWT, BBS+/AnonCreds, VC selective reveal) to
   prove facts without oversharing.

3. Enforce policy (ABAC/RBAC), record consent and support purpose limitation.

**Standards & assurance:** OIDC/SAML, W3C
[Verifiable Credentials](https://www.corbado.com/blog/eudi-wallet-2026-deadline-rollout-eic-2026) proofs,
relevant ISO mobile credential standards and data-minimisation guidance.

**Lifecycle:** Manage attribute issuance, expiry/refresh and revocation. Record and
version consent; require re-assertion when source data changes or when regulatory/business
needs demand current proofs.

**Security & privacy:** Require explicit, auditable consent per attribute release. Use
pairwise or pseudonymous identifiers to avoid cross-site linking, and store only minimal
audit metadata needed for compliance.

**Outputs:** Scoped attribute set released for the transaction, consent record, and
release policy metadata (expiry, provenance, revocation status).

#### 4.2.5 Governance

**How it works:**

1. Define and publish policies (proofing SOPs, credential lifecycle, recovery,
   crypto-agility, incident response).

2. Maintain compliance mappings, certification (where applicable), trust lists and
   third-party risk controls.

3. Monitor operations with fraud analytics, audits and continuous improvement; handle user
   lifecycle events (name change, lost device, re-proofing).

**Standards & assurance:** Align governance artifacts with applicable frameworks (e.g.,
[eIDAS](https://www.corbado.com/glossary/eidas), [NIST](https://www.corbado.com/blog/nist-passkeys)), certification schemes (FIDO, PKI
profiles) and industry trust lists.

**Lifecycle:** Version governance documents and trust metadata; schedule audits, risk
reviews and key/certificate renewals. Ensure rapid revocation and coordinated re-issuance
after incidents.

**Security & privacy:** Embed privacy-by-design: DPIAs, least-privilege RBAC, protected
telemetry and encrypted audit logs. Require security/privacy controls from vendors and
maintain retention/deletion rules and breach notification procedures.

**Outputs:** Maintained trust posture: published policies and SOPs, operational audit
logs, updated trust anchors/credentials, and evidence of compliance and incident handling.

### 4.3 Why did trusted digital Identity emerge?

The following are some of the most common drivers behind the emergence of trusted digital
identity, spanning security, compliance, technology, and user experience.

- **Password crisis:** Breaches, [phishing](https://www.corbado.com/glossary/phishing), and account recovery
  costs made passwords (and SMS OTPs) untenable at scale; we needed
  [phishing](https://www.corbado.com/glossary/phishing)-resistant, crypto-backed authentication.

- **Remote onboarding & compliance:** Banks, gov, and
  [healthcare](https://www.corbado.com/passkeys-for-healthcare) had to verify people remotely (KYC/AML,
  age/eligibility). That required auditable proofing levels, not just accounts.

- **Digital transformation of high-stakes services:** [Payments](https://www.corbado.com/passkeys-for-payment),
  e-gov, and telehealth moved online and cross-border; relying parties needed confidence
  in _who_ they were dealing with, not just a username.

- Federation limits: [SSO](https://www.corbado.com/blog/passkeys-single-sign-on-sso) (OIDC/SAML) solved
  convenience but not assurance, selective disclosure, or strong binding between a real
  person and credentials.

- **Privacy & regulation:** GDPR/[eIDAS](https://www.corbado.com/glossary/eidas) (and similar) pushed data
  minimization, consent, and revocation, driving models with pairwise IDs and
  attribute-level control.

- **Zero-trust architectures:** Modern security assumes every request must be re-verified;
  that needs strong identity signals (user, device, key, posture), not weak factors.

- **Hardware & wallet readiness:** Secure enclaves, platform biometrics, and smartphones
  made it practical to bind identities to strong keys (passkeys, smartcards,
  [wallets](https://www.corbado.com/blog/digital-wallet-assurance)).

- **Interoperability standards:** [NIST](https://www.corbado.com/blog/nist-passkeys)
  [IAL](https://www.corbado.com/glossary/ial)/[AAL](https://www.corbado.com/faq/authenticator-assurance-levels-aal-digital-identity),
  eIDAS LoA, [FIDO2](https://www.corbado.com/glossary/fido2)/WebAuthn, W3C Verifiable Credentials, and ISO
  [mdoc](https://www.corbado.com/glossary/mdoc) created shared assurance languages and portable credentials.

- **Economics & UX:** Lower fraud and support costs (bye,
  [password resets](https://www.corbado.com/faq/passkeys-reduce-password-resets-otp-costs)/SMS) with better
  conversion and fewer MFA-fatigue failures.

- **Ecosystem momentum:** [Governments](https://www.corbado.com/passkeys-for-public-sector) (e.g., eIDAS2
  [wallets](https://www.corbado.com/blog/digital-wallet-assurance)), platforms (Apple/Google/Microsoft passkeys),
  and industry alliances aligned, making “trusted” identity deployable at scale.

### 4.4 Where is trusted digital Identity used?

#### 4.4.1 Banking & Financial Services

- **Use case:** Faster, more secure Know Your Customer (KYC) and onboarding. This
  streamlines [account opening](https://www.corbado.com/blog/digital-identity-verification) and high-value
  transactions by allowing banks to instantly confirm a customer’s identity without manual
  checks. It’s particularly valuable for remote [banking](https://www.corbado.com/passkeys-for-banking) and
  reducing drop-off rates during digital onboarding.

- **How it works:** Customers authenticate with a government-issued digital ID or
  bank-provided trusted identity to instantly verify their identity instead of submitting
  physical documents.

- **Benefits:**
    - Reduces onboarding from days to minutes

    - Minimizes fraud risk with strong cryptographic proof

    - Enables secure remote [account opening](https://www.corbado.com/blog/digital-identity-verification),
      [loan applications](https://www.freedomdebtrelief.com/loans/), and high-value
      transaction approvals

- **Example:** Nordic BankID, Singapore’s Singpass used for
  [bank onboarding](https://www.corbado.com/blog/iso-18013-7-mdl-bank-kyc-onboarding)

#### 4.4.2 Government & Public Services

- **Use case:** eID programs for accessing government portals and services. These allow
  citizens to authenticate once and gain secure, seamless access to a wide range of
  services, from filing taxes to updating personal records, without having to re-verify
  for each service. This increases efficiency for both citizens and government agencies.

- **How it works:** Citizens use a digital identity
  [wallet](https://www.corbado.com/blog/digital-wallet-assurance) or [smart card](https://www.corbado.com/glossary/smart-card) to log in
  to tax portals, health services, and voting systems with strong authentication.

- **Benefits:**
    - Centralized yet secure access to multiple services

    - Reduces paperwork and in-person visits

    - Improves privacy by using selective disclosure (only the needed data is shared)

- **Example:** Estonia e-Residency, Germany’s Online-Ausweisfunktion, Australia’s myGovID

#### 4.4.3 Healthcare

- **Use case:** Secure access to patient records and telemedicine platforms. Trusted
  digital identities ensure that only verified [healthcare](https://www.corbado.com/passkeys-for-healthcare)
  professionals and the correct patients can access sensitive records or participate in
  consultations. This improves trust in remote [healthcare](https://www.corbado.com/passkeys-for-healthcare) and
  reduces the risk of medical errors or data breaches. Some organizations rely on
  [custom healthcare software development services](https://www.kandasoft.com/verticals/healthcare-software-development)
  to build or integrate their identity solutions.

- **How it works:** Patients and healthcare professionals authenticate with trusted IDs
  linked to verified licenses or health records.

- **Benefits:**
    - Confirms patient identity in remote consultations

    - Controls access to sensitive health data

    - Streamlines cross-institution data sharing while complying with HIPAA/GDPR

- Example: Estonia’s state e-ID for e-health records and e-prescriptions, the UK’s NHS
  Login / NHS App for records, repeat prescriptions and remote consultations

#### 4.4.4 Travel & Transportation

- **Use case:** Digital passports and boarding. Travelers can store their identity
  credentials on mobile devices for quick, secure verification at borders, security gates,
  and boarding points. This not only speeds up the process but also reduces the need for
  handling physical documents in high-traffic environments.

- **How it works:** Mobile IDs or digital [travel](https://www.corbado.com/passkeys-for-travel) credentials
  verify identity at border checkpoints and [airline](https://www.corbado.com/passkeys-for-airlines) gates.

- **Benefits:**
    - Speeds up security checks

    - Supports touchless, paperless [travel](https://www.corbado.com/passkeys-for-travel)

    - Increases fraud detection accuracy

- **Example:** ICAO Digital [Travel](https://www.corbado.com/passkeys-for-travel) Credential (DTC), Apple Wallet
  [mDL](https://www.corbado.com/blog/mobile-drivers-license) for TSA checkpoints

## 5. Self Sovereign Identity (SSI)

Among emerging identity models, **Self-Sovereign Identity (SSI)** represents the most
decentralized approach, shifting ownership and control of credentials entirely to the
individual. It builds on advances in cryptography, distributed systems, and open standards
to eliminate reliance on a single authority.

### 5.1 What is Self Sovereign Identity (SSI)?

Self-Sovereign Identity (SSI) is a **digital identity model** that places individuals at
the center of their own identity management. Unlike traditional identity systems where
credentials are stored and controlled by centralized authorities (e.g., government
databases, corporate login systems, or social media platforms), SSI allows people to
**own, control, and manage their identity data directly**.

With SSI, identity credentials,such as proof of age, education, professional
qualifications, or licenses, are issued to an individual and stored in their **secure
digital wallet**. The individual can then decide exactly what information to share with a
service provider, employer, or government agency.

**Key principles of SSI**:

- **Ownership**: The user holds their credentials, not a third party.

- **Control**: The user chooses when, where, and how their identity information is shared.

- **Consent**: Sharing is always intentional and permission-based.

- **Privacy**: Only the necessary data is disclosed (selective disclosure), and
  credentials can be revoked at any time.

- **Independence**: No dependency on a single issuing entity or centralized database.

**In essence:** SSI is both a **technological framework** and a **philosophy** that
identity should be portable, privacy-preserving, and entirely user-owned.

### 5.2 What are Decentralized Identifiers (DIDs)?

A **Decentralized Identifier (DID)** is the technical foundations underlaying SSI. It is a
type of globally unique identifier designed for decentralized identity systems. It is part
of the **W3C DID standard** and is the key mechanism that enables SSI to function without
centralized registries.

**DIDs have a few unique attributes that make them DIDs different from traditional
identifiers** (like email addresses or national ID numbers):

- **No central authority**: DIDs can be created and managed without registering with a
  government, company, or platform.

- **Self-generated**: Users create DIDs locally, on their own device, without requiring
  approval from an issuing body.

- **Decentralized resolution**: Each DID resolves to a **DID Document**, which contains:
    - Public keys (to prove ownership via cryptographic signatures)

    - Service endpoints (for secure communication)

    - Metadata about the DID

- **Security and resilience**: Since they can be anchored in blockchains or distributed
  ledgers, DIDs avoid single points of failure and provide a tamper-resistant verification
  method.

**Role of DIDs in SSI**:

- **Issuer**: Uses a DID to sign credentials.

- **Holder**: Uses one or more DIDs to represent themselves when receiving or presenting
  credentials.

- **Verifier**: Uses a DID to identify itself and verify presented credentials.

### 5.3 What are the benefits of SSI compared to traditional or federated Identity?

Compared to **centralized identity systems** (where credentials live in one company’s
database) and **federated identity systems** (where you log in via a central provider like
Google or [Facebook](https://www.corbado.com/blog/facebook-passkeys)), SSI offers:

1. **User control & portability**: Credentials are not tied to a single service; you can
   take them anywhere and use them across multiple platforms.

2. **Privacy by design**: Selective disclosure and unlinkable proofs allow you to reveal
   only what’s necessary (e.g., prove you’re over 18 without revealing your birth date).

3. **Phishing resistance**: Authentication uses cryptographic proofs instead of passwords
   or redirect-based logins, removing common phishing attack vectors.

4. **Open, interoperable ecosystem**: Built on open standards, meaning credentials from
   one [issuer](https://www.corbado.com/glossary/issuer) can be verified by any compliant verifier, creating a
   global trust network.

### 5.4 What are the core building Blocks of SSI?

1. **Decentralized Identifiers (DIDs)**: Unique, self-controlled identifiers like
   did:method:abc123. Each DID resolves to a DID Document containing the public keys and
   service endpoints necessary for secure, verifiable communication.

2. **Verifiable Credentials (VCs)**: Cryptographically signed statements (e.g., “is over
   18”, “has a driver’s license”, “holds an MBA”) issued by a trusted entity. These are
   tamper-evident and can be cryptographically verified without contacting the
   [issuer](https://www.corbado.com/glossary/issuer).

3. **Wallet**: Secure software (mobile app, browser extension, or desktop app) that stores
   your DIDs and VCs, allows you to present credentials with selective disclosure, and
   helps manage keys, revocation, and consent.

### 5.5 How does SSI work step-by-step?

1. **Create an Identifier**: The holder generates a DID locally; this process also
   generates a private/public key pair. The private key stays on the holder’s device.

2. **Obtain Credentials**: An issuer (bank, university, government, employer) issues a
   **Verifiable Credential (VC)** to the holder’s wallet. The credential is digitally
   signed by the issuer’s private key.

3. **Present Proofs**: When a verifier requests proof, the holder creates a **Verifiable
   Presentation** containing only the required data, often using **zero-knowledge proofs**
   to avoid revealing extra details.

4. **Verification**: The verifier:
    - Checks the issuer’s signature using the public key in the issuer’s DID Document.

    - Confirms the holder controls the DID (proof of possession).

    - Consults a revocation registry or status list to ensure the credential hasn’t been
      revoked.

5. **Authorization**: If the credential is valid and meets the verifier’s requirements,
   access is granted, a transaction is approved, or the service is provided, **all without
   a central identity provider being involved**.

![SSI flow](https://s3.eu-central-1.amazonaws.com/corbado-cloud-staging-website-assets/SSI_flow_dc0dc5c040.svg)

**How this relates to passkeys/WebAuthn?**

Passkeys can secure the wallet itself or be used as the cryptographic keys behind a DID.
In practice, you can authenticate the user with passkeys and use DIDs/VCs for portable,
privacy-preserving attributes and claims.

## 6. How Corbado can help

This guide contrasts three identity models, and the point that survives all of them is
that a centralized store of shared secrets is a single point of failure. Equifax is the
example. Passkeys remove the secret, but most organisations reading this still run the
password login, so the honest first step is knowing what that login does today.
[Corbado Observe](https://www.corbado.com/observe), the
[authentication observability](https://www.corbado.com/blog/authentication-observability) layer, reports it
without any passkey work.

[Video: Login methods kpis](https://www.corbado.com/videos/features/login-methods-kpis.mp4) ([See Login Methods in Corbado Observe](https://www.corbado.com/observe/login-methods))

- **What your current login actually runs on:**
  [method distribution](https://www.corbado.com/observe/login-methods) shows the share still depending on a
  reusable credential, split by segment rather than as one number.
- **Where the second factor loses people:** the MFA step appears with its own drop-off,
  which is usually the figure nobody can produce on request.
- **A baseline before you change anything:** with today recorded, a later move to passkeys
  has something to be measured against.

When the data says which cohorts are ready, [Corbado Connect](https://www.corbado.com/connect) removes the shared
secret itself, on top of the identity system you already run.

## 7. Conclusion

As economies, and critical services continue to move online, the foundation of secure and
trustworthy digital interactions will be strong, verifiable digital identities. Whether
managed through centralized, trusted, or fully self-sovereign approaches, the key will be
to combine high assurance with user empowerment. Decentralized and user-controlled models,
enabled by technologies like passkeys, decentralized identifiers, and verifiable
credentials, offer a path to reduce reliance on vulnerable central repositories while
giving individuals greater privacy, portability, and choice. By investing in robust,
interoperable, and user-centric identity systems today, we can build the trust and
resilience that the digital future demands.

In this blog we answered the most important questions associated with the digital identity
space:

- **What are the main models of digital identity (Centralized Digital Identity, Trusted
  Digital Identity, and Self-Sovereign Identity) and how do they differ?** Centralized
  Digital Identity, Trusted Digital Identity, and Self-Sovereign Identity differ in how
  credentials are issued, stored, and controlled, from a single authority in centralized
  systems, to standards-based,
  [verifiable credentials](https://www.corbado.com/blog/eudi-wallet-2026-deadline-rollout-eic-2026) in trusted
  identity, to fully user-owned and portable credentials in SSI.

- **What challenges do traditional centralized identity systems face?** Traditional
  centralized identity systems face risks such as single points of failure, privacy and
  compliance challenges, fragmented user control, and reliance on insecure password-based
  authentication.

- **How do emerging models like trusted digital identity and SSI address these
  challenges?** Trusted digital identity and SSI address these issues by using
  cryptographic credentials, privacy-preserving attribute sharing, and decentralized
  control to enhance security, interoperability, and user autonomy.

## Frequently Asked Questions

### What is the difference between centralized identity, trusted digital identity and self-sovereign identity?

Centralized identity stores credentials in a single authority's database, creating privacy
and security risks. Trusted digital identity adds standards-based assurance (NIST IAL/AAL,
eIDAS) with cryptographic binding to verify credential holders. SSI gives users full
ownership, storing credentials in personal wallets with selective disclosure and no
central registry required.

### How does a Decentralized Identifier (DID) work and why does it not require a central authority?

A DID is a globally unique identifier defined by the W3C DID standard that users generate
locally without registering with any government, company or platform. Each DID resolves to
a DID Document containing public keys and service endpoints. DIDs can be anchored in
blockchains or distributed ledgers to avoid single points of failure.

### What assurance levels and standards govern trusted digital identity systems?

Trusted digital identity systems map to NIST IAL 1-3 for identity proofing and AAL levels
for authentication, alongside eIDAS assurance levels of Low, Substantial and High.
Credential standards include FIDO2/WebAuthn for authentication and W3C Verifiable
Credentials and ISO 18013-5 for portable credentials. These shared frameworks allow
relying parties to know exactly how much to trust a given identity.

### How do passkeys integrate with self-sovereign identity wallets and verifiable credentials?

Passkeys can secure the digital identity wallet itself or serve as the cryptographic keys
underlying a DID. In practice, passkeys authenticate the user while DIDs and Verifiable
Credentials handle portable, privacy-preserving attribute claims. This combination
delivers strong authentication assurance alongside selective disclosure of identity
attributes.

### How does SSI's selective disclosure work in practice compared to traditional login systems?

SSI uses zero-knowledge proofs to prove facts, such as being over 18, without revealing
the underlying attribute like a birth date. Credentials are stored in user-controlled
wallets and shared as Verifiable Presentations containing only required data. Traditional
login systems instead expose full profile data and rely on passwords vulnerable to
phishing.