| Package | Description | 
|---|---|
| org.apache.hadoop.security.authentication.server | Provides the server-side framework for authentication. | 
| Class and Description | 
|---|
| AltKerberosAuthenticationHandler The  AltKerberosAuthenticationHandlerbehaves exactly the same way as
 theKerberosAuthenticationHandler, except that it allows for an
 alternative form of authentication for browsers while still using Kerberos
 for Java access. | 
| AuthenticationHandler Interface for server authentication mechanisms. | 
| AuthenticationToken The  AuthenticationTokencontains information about an authenticated
 HTTP client and doubles as thePrincipalto be returned by
 authenticatedHttpServletRequests | 
| CompositeAuthenticationHandler Interface to support multiple authentication mechanisms simultaneously. | 
| KerberosAuthenticationHandler The  KerberosAuthenticationHandlerimplements the Kerberos SPNEGO
 authentication mechanism for HTTP. | 
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