code: public static AuthToken kerberos( String base64EncodedTicket )
      {
          Objects.requireNonNull( base64EncodedTicket, "Ticket can't be null" );
  
          Map<String,Value> map = newHashMapWithSize( 3 );
          map.put( SCHEME_KEY, value( "kerberos" ) );
          map.put( PRINCIPAL_KEY, value( "" ) ); // This empty string is required for backwards compatibility.
          map.put( CREDENTIALS_KEY, value( base64EncodedTicket ) );
          return new InternalAuthToken( map );
      }
docs: The kerberos authentication scheme, using a base64 encoded ticket
  @param base64EncodedTicket a base64 encoded service ticket
  @return an authentication token that can be used to connect to Neo4j
  @see GraphDatabase#driver(String, AuthToken)
  @since 1.3
  @throws NullPointerException when ticket is {@code null}