# Authentication

- [Authentication options](/5.1/configure/security/authentication/authentication_options.md): StackState Self-hosted v5.1.x
- [File based](/5.1/configure/security/authentication/file.md): StackState Self-hosted v5.1.x
- [LDAP](/5.1/configure/security/authentication/ldap.md): StackState Self-hosted v5.1.x
- [Open ID Connect (OIDC)](/5.1/configure/security/authentication/oidc.md): StackState Self-hosted v5.1.x
- [KeyCloak](/5.1/configure/security/authentication/keycloak.md): StackState Self-hosted v5.1.x
- [Service tokens](/5.1/configure/security/authentication/service_tokens.md): StackState Self-hosted v5.1.x