Popa3d v0.4 Contributions: Kerberos v4 and APOP Authentication Enhancements

Dug Song has contributed Kerberos v4 (KPOP) and APOP authentication patches for popa3d v0.4. I've mirrored them into popa3d/contrib on the FTP and added links to the popa3d page at the usual location: . . . Dug Song has contributed Kerberos v4 (KPOP) and APOP authentication
patches for popa3d v0.4. I've mirrored them into popa3d/contrib on
the FTP and added links to the popa3d page at the usual location:

https://www.openwall.com/popa3d/

Please note that both of these patches are "unofficial"; while I have
plans to support APOP some time in the future (possibly in v0.5), the
database format will likely differ. Also be aware that APOP does not
necessarily improve security: it requires that plaintext passwords be
stored at the server, and its challenge/response pairs are vulnerable
to offline "dictionary attacks".

Signed,
Solar Designer