What are the 3 heads of Kerberos?

[eichin-krb@thok.org]

The first one (A/A/A).  I've never even *heard* the second two
theories, and I've been involved with kerberos since the late
1980's...  you can confirm that they were the three goals by looking
at athena-dist.mit.edu:/pub/ATHENA/kerberos/doc/techplan.txt, under
"GOALS OF KERBEROS",  though it doesn't *explicitly* tie them to the
dog heads, further digging should find a stronger reference (for
example, one of Dan Geer's tutorials from that era.)