Requiring everyone to register a public key
This is already the case in Estonia, where every citizen over the age of 14 has a government-issued ID card containing two X.509 RSA key pairs. TLS client authentication is widely deployed for Estonian web services such as internet banking.
(Due to ideological differences regarding the centralization of trust, I think it's unlikely that governments will adopt OpenPGP over X.509.)
Giving people an official RSA keypair in their smartcard government IDs is fine. That solves all sorts of problems, and enables a bunch of really cool tech.
Requiring that every public key used in any context be registered with the government, or worse, some sort of key escrow, is a totally different matter.
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
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