A number of people have been blogging about the state of the SSL Certificate Security Warning since the release of Firefox 3.0.
I must admit, personally I don't mind the dialog that pops up -- it scares the everyday user into thinking twice before sending their data to Nigeria by accident.
It is actually far more awkward to import the various extra root certificates into the various operating environments, than it is to do certificate exemptions on a site by site basis.
I found the report that Federico linked to slightly disturbing -- if 58% of certificates are indeed invalid, expired or otherwise bad, that's a hell of a lot of users that are experiencing an all-too-confusing dialog box far too often.
(On that note: If you have an expired certificate, you should really get it renewed -- especially with a commercial signer, after all -- you've built a reputation with that certificate, you shouldn't have customers turning away because that little yellow bar they've been used to becomes a scary looking error message.)
I like CACert myself, I use it for things regularly and i've configured several e-commerce installations to use certificates for it, after going through the somewhat painful verification process to get a two-year certificate instead of a three-month one.
For commercial stuff though, CACert isn't really practical -- especially considering very few operating environments include their root certificates by default.
For semi-commercial stuff, there's no middle-ground, there's either commerical CA's, Homebrew, or nothing.
For personal use, there's GNU Privacy Guard -- a much better, but less Microsoft-supported way of confirming you really are who you say you are.
I've often thought about the issue in my business, where I see all sorts of certificates on a week-to-week basis -- and often need to handle the case of 'a user complained my certificate was invalid, I bought it and gave it to you, so you must have broken it.'
The thing I haven't been able to come up with yet, is the solution:
- For big corporates, there's Verisign or Thwate, which is prohibitively expensive for a single-user in the home.
SME'sthere's second-tier signers, like Comodo, GoDaddy or Network Solutions. For ~$100USD p/year, you can get a certificate that works 'most of the time'.
- For Free Software Developers and other Personal Use there's basically CACert, or doing it yourself. Neither of which, are supported by anything remotely mainstream without doing a hell of a lot of legwork yourself.
Maybe Mozilla themselves, or Google could do something to help the situation by running a CA that works in parallel with the other services they provide -- but how would that be any less work that rubber-stamping CACert?
Well, even though the principle is the same, if Google did it -- it'd probably be supported everywhere -- but as of now, CACert are still running the gauntlet with Mozilla and will probably have a much more difficult task getting past Microsoft and Apple, accordingly.