To manage login with both mobile and web to an existing auth system using a self-hosted Ory Kratos, you would need to configure various aspects of Ory Kratos. Here are some steps you can follow: 1. Configure Multi-Factor Authentication (MFA): You can configure WebAuthn and Time-based One-Time Passwords (TOTP) in your self-hosted Kratos instance. For WebAuthn, add the

webauthn

method to

selfservice.methods

in the Ory Kratos configuration file. For TOTP, add the

totp

method to

selfservice.methods

in the configuration file. WebAuthn Configuration:

yaml selfservice:     methods:       webauthn:         config:           passwordless: false           rp:             display_name: SAMPLE_NAME             id: <http://loginpage.com|loginpage.com>             origin: <https://loginpage.auth.com:4455>         enabled: true

TOTP Configuration:

yaml selfservice:     methods:       totp:         config:           issuer: <http://ExampleIssuerForSelfHosted.com|ExampleIssuerForSelfHosted.com>         enabled: true

(Source: [WebAuthn](https://www.ory.sh/docs/kratos/self-hosted/mfa#webauthn), [TOTP](https://www.ory.sh/docs/kratos/self-hosted/mfa#time-based-one-time-passwords-totp)) 2. Integrate Authentication into Your Application: You can integrate Ory Kratos into your application (both mobile and web) by following the steps provided in the [Ory documentation](https://www.ory.sh/docs/getting-started/integrate-auth/flutter-web-redirect#test-you-application). This includes cloning and running Ory Kratos locally, setting the environment variable to the exposed port, running the Ory tunnel to expose Ory API under the same top-level domain as your application, and accessing the application. 3. Use Identity Management API: You can use the [IdentityAPI](https://www.ory.sh/docs/kratos/reference/api#tag/identity) to manage user identities in your application. The requests need to be authorized. 4. Configure Social Sign-in: If you want to add a social sign-in provider, you can follow the steps provided in the [Ory documentation](https://www.ory.sh/docs/self-hosted/kratos/configuration/oidc). This includes defining the redirect URL, creating a client at your provider to get the Client ID and Client Secret, setting the redirect URI, creating a Jsonnet code snippet to map the desired claims to the Ory Identity schema, encoding the Jsonnet snippet with Base64 or storing it in a location available to your Ory Kratos instance, and adding the configuration for your social sign-in provider to the Ory Kratos configuration. Please note that you need to adjust these configurations according to your existing auth system and application requirements.