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# Authentication
The NATS server provides various ways of authenticating clients:
* [Token Authentication](tokens.md)
* [Username/Password credentials](username_password.md)
* [TLS Certificate](tls_mutual_auth.md)
* [NKEY with Challenge](nkey_auth.md)
* [Accounts](accounts.md)
* [JWTs](jwt_auth.md)
Authentication deals with allowing a NATS client to connect to the server. Except for JWT authentication, authentication and authorization are configured in the `authorization` section of the configuration.
## Authorization Map
The `authorization` block provides _authentication_ configuration as well as _authorization_:
| Property | Description |
| :--- | :--- |
| [`token`](tokens.md) | Specifies a global token that can be used to authenticate to the server \(exclusive of user and password\) |
| [`user`](username_password.md) | Specifies a single _global_ user name for clients to the server \(exclusive of token\) |
| [`password`](username_password.md) | Specifies a single _global_ password for clients to the server \(exclusive of `token`\) |
| `users` | A list of user configuration maps |
| `timeout` | Maximum number of seconds to wait for client authentication |
For multiple username and password credentials, specify a `users` list.
## User Configuration Map
A `user` configuration map specifies credentials and permissions options for a single user:
| Property | Description |
| :--- | :--- |
| [`user`](username_password.md) | username for client authentication |
| [`password`](username_password.md) | password for the user entry |
| [`nkey`](nkey_auth.md) | public nkey identifying an user |
| [`permissions`](../authorization.md) | permissions map configuring subjects accessible to the user |