| Class | Description | 
|---|---|
| AuthenticationKey | Represents a secret key used for signing and verifying authentication tokens
 by  AuthenticationTokenSecretManager. | 
| AuthenticationTokenIdentifier | Represents the identity information stored in an HBase authentication token. | 
| AuthenticationTokenSecretManager | Manages an internal list of secret keys used to sign new authentication
 tokens as they are generated, and to valid existing tokens used for
 authentication. | 
| AuthenticationTokenSelector | |
| ClientTokenUtil | Utility methods for obtaining authentication tokens, that do not require hbase-server. | 
| FsDelegationToken | Helper class to obtain a filesystem delegation token. | 
| TokenProvider | Provides a service for obtaining authentication tokens via the
  AuthenticationProtosAuthenticationService coprocessor service. | 
| TokenUtil | Utility methods for obtaining authentication tokens. | 
| ZKSecretWatcher | Synchronizes token encryption keys across cluster nodes. | 
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