[messaging] TOFU to ease PGP key discovery

[elijah]

On 02/11/2015 03:00 AM, Mike Hearn wrote:

> The reason it's limited to personal use is that issuing and managing
> certificates has a cost.

True that. In the non-CA case, those costs are wholly or largely born by
the email providers themselves in most of the automatic key validation
proposals (e.g. nyms, CONIKS). The providers presumably already have
some business model for why they are offering email accounts.

-elijah