You might also try reading some of his more recent discussion comments on IETF working groups:
- http://www.ietf.org/mail-archive/web/websec/current/maillist...
- http://www.ietf.org/mail-archive/web/tls/current/maillist.ht...
- (from 2002): http://mhonarc.domainunion.de/archive/html/ietf-openpgp/2002...
Just a few things that turned up when I Googled him.