Web of Trust vs other models

[Hal]

From: Bill Stewart <stewarts at ix.netcom.com>
> 
> Meanwhile, Don Kitchen at one point collected all the data off the
> MIT keyserver for analysis, which is a much different problem than
> random signatures.  I found that the chain from some middle point,
> such as Phil Zimmermann's or Derek Atkins's key was about 12-14 levels
> deep, averaging about 6, which compares interestingly with the
> default PGP depth limit of4.  From my key, it was pretty deep,
> especially since my certification from Phil Karn was from one of
> his older keys, which is why I asked Derek to sign my key...

Let's not forget that the web of trust only works if you personally
know and trust the next-to-last person in the chain (the one who signed
the key you are interested in).  Chain length doesn't matter if you've
never heard of the last signer.

Hal