# 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. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://support.emsigner.com/key-concepts/authentication-methods.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.