Problemas do PGP

Um post muito interessante do Matthew Green sobre os problemas do PGP. Alguns excertos:

What's the matter with PGP?


As transparent and user-friendly as the new email extensions are, they're fundamentally just re-implementations of OpenPGP -- and non-legacy-compatible ones, too. The problem with this is that, for all the good PGP has done in the past, it's a model of email encryption that's fundamentally broken.

It's time for PGP to die.

In the remainder of this post I'm going to explain why this is so, what it means for the future of email encryption, and some of the things we should do about it. Nothing I'm going to say here will surprise anyone who's familiar with the technology -- in fact, this will barely be a technical post. That's because, fundamentally, most of the problems with email encryption aren't hyper-technical problems. They're still baked into the cake.



So what should we be doing?

Quite a lot actually. The path to a proper encrypted email system isn't that far off. At minimum, any real solution needs:

  • A proper approach to key management. This could be anything from centralized key management as in Apple's iMessage -- which would still be better than nothing -- to a decentralized (but still usable) approach like the one offered by Signal or OTR. Whatever the solution, in order to achieve mass deployment, keys need to be made much more manageable or else submerged from the user altogether.
  • Forward secrecy baked into the protocol. This should be a pre-condition to any secure messaging system. 
  • Cryptography that post-dates the Fresh Prince. Enough said.
  • Screw backwards compatibility. Securing both encrypted and unencrypted email is too hard. We need dedicated networks that handle this from the start.


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