> For the complete documentation index, see [llms.txt](https://docs.emsigner.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.emsigner.com/key-concepts/authentication-methods.md).

# Authentication Methods

The platform supports multiple signer authentication methods to validate identity before signature execution. 

For Internal Users, the platform supports OTP and Single Sign On through Azure AD and other SSO providers to enable a secure login to the system

For External Users, the platform supports validation of users using OTP, Advanced Authentication using Liveness or full ID verification through a Digital ID integration. The authentication methods can be configured per workflow based on risk, regulatory, and business requirements.