Rx Security Class Registry

The assignment of Rx Security Class identifiers to security classes is specific
to each Rx Service ID with the exception of Rx Security Class 0 (zero) aka rxnull
which is common to all Rx Services.

Transarc/IBM AFS 3.x assigned the following Security Class IDs for use on all
of its Rx services:

Name       ID     Description
-------  ------   -----------------------------------------------
VAB	      1   Vice tokens with bcrypt
KAD           2   Kerberos tokens with fcrypt optional
KAD_REQ       3   Kerberos tokens with fcrypt required


OpenAFS inherited the IBM AFS 3.6 assignments, dropped VAB and
added some new security classes:

Name       ID     Description
-------  ------   -----------------------------------------------
KAD           2   Kerberos tokens with fcrypt optional
KAD_REQ       3   Kerberos tokens with fcrypt required
RXGK          4   GSS-API Kerberos Crypto Framework
RXK5          5   Kerberos 5 authentication for rx
YFS-RXGK      6   AuriStorFS RXGK variant (afs3@auristor.com)


AuriStorFS services support the following assignments:

Name       ID     Description
-------  ------   -----------------------------------------------
KAD           2   Kerberos tokens with fcrypt optional
KAD_REQ       3   Kerberos tokens with fcrypt required
YFS-RXGK      6   AuriStorFS RXGK variant (afs3@auristor.com)