[Cryptography] Size of the PGP userbase?

[Ralph Holz]

Hi,

> Aha!  So you could measure the ratio of PGP to S/MIME usage by message
> from that.  You could also count the number of distinct users for each
> population.

Very hard to get unless you have a tap into a major MX. Much SMTP
traffic is SSL-secured today (which is a good thing), and thus the
standard monitoring setups, where the monitors sits near the border
router, cannot determine if there is a signature inside the traffic.

The significance of doing local measurements is very disputable.

Ralph