[salviati]

This would also add the requirement of an accurate internal clock.

[throwaway89201]

In theory, you can add some more complexity/fragility and have 'time notaries' sign the current time together with a challenge from the passport, verifiable against embedded public keys.

[Scoundreller]

Driveby bricking of passports, coming to an airport near you!

[namibj]

German id cards essentially record the newest issuance timestamp seen; then they block certificates that expired prior to this recorded value.

[cperciva]

So one erroneously issued certificate can brick every ID card in the country?

[ACCount37]

Pretty much. But you would need, first, to issue a valid certificate with a timestamp far ahead in the future. And then expose every ID card in the country to it.