# Keychain - [SSH keys and certificates](https://docs.termius.com/keychain/ssh-keys-and-certificates.md): This page describes how to manage SSH keys and certificates in Termius, including FIDO2 hardware keys and biometric keys. - [Identities](https://docs.termius.com/keychain/identities.md): This page explains what identities are in Termius and how to use them to reuse credentials across Hosts and Groups. - [Sync of keys and passwords](https://docs.termius.com/keychain/sync-of-keys-and-passwords.md): This page explains how keychain synchronization differs from other data sync and how to keep your credentials stored locally while syncing the rest of your Vault data. --- # 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://docs.termius.com/keychain.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.