Oh man… well the knee-jerk reaction is “heck no!”
Writing the book has forced us to think a lot about the philosophy of the security/privacy tradeoff. It is very much a tradeoff, and I don’t think it’s possible to achieve both simultaneously.
One of the interesting things we came across was while researching the use of TPMs (a hardware chip which provides strong platform identity and security). We found that a lot of work had been done in recent versions of the remote attestation protocol in order to provide privacy. This was due to the fact that folks had begun to use TPMs to enforce DRM, and that the integrity of the TPM would be checked prior to allowing the music (or whatever) to play. This was a major privacy concern, because it meant that folks controlling the DRM would get to know the “real” identity of the hardware wanting to play it. To solve for this, the protocol was changed such that the posture could be checked without revealing this identity. Lo and behold, this is exactly the opposite of what we wanted!
So, I strongly believe that encryption is necessary, and should be applied in a ubiquitous way, with endpoints controlling the keys. I acknowledge the fact that it is very difficult to give traditional security guarantees in this brave new world, however perhaps the answer is that we need evolve our security posture to take this into account. For instance, it was erroneously publicized that Whatsapp encryption was “hacked” because a law enforcement agency was able to uncover messages sent by it. Turns out that they didn’t actually break the encryption - they just hacked the phone and took a screenshot of the messages. Law enforcement tactics like this are still effective in the face of end-to-end encryption. And good news for us - these tactics must happen in a targeted way, as opposed to the dragnet approach that is commonly employed today.
Also, IMO one motivator to break or ban encryption is that wide adoption of secure end-to-end encryption is sinking very large investments made by certain governments