To me, Key Recovery cryptography is like using a condom with a hole in it. No thanks.
I agree in principle, and I doubt I would ever use a key recovery system if I had a choice. But, speaking as a network manager, I know that private key recovery (not GAK) can be an enhancement to security. I'll give an example. About a year ago, my boss wanted to protect his file of annual financial projections for the company from prying eyes on our Macintosh network. I installed CurveEncrypt on his machine, showed him how to use it, and gave him the standard lecture on choosing a good passphrase. I stressed that he needed to chose a passphrase easy to remember, because if he forgot it, there was no way to get his file back. Well, he forgot his passphrase. He spent an hour trying every combination he could think of, interjecting a curse here and there for color. He is now totally off using encryption to protect sensitive information. He refuses to use it, and he discourages anyone in the office from using it. I know that his position is unfair, but he _is_ the boss, so he makes the rules. And he is a typical computer user. If your average joe forgets his passphrase and loses two days worth of work, he's not likely to encrypt his work again. (Or he's likely to write down his passphrase in the future). If we were using a Key Escrow system, this situation could have been avoided. Yes, using a key escrow system is less secure that using a non-key escrow system, but I'd argue that using a strong key escrow system is better than using no encryption at all in situations like this. Our network is less secure that it could be because of one user's bad experience. Ken