token

   A random alphanumeric string that functions as a password
   authorizing a server connection. The format of the token depends
   on the authorization scheme in use. MIT-MAGIC-COOKIE-1 uses a
   128-bit string known as a magic cookie. MIT-KERBEROS-5 uses an
   encrypted string to authorize server connections. This string
   is stored separately. The token entry in the X authority file
   represents the encoded location of the Kerberos keytab file and
   associated principal name, which is referenced by the server to
   locate the encrypted string.