You could never really trust, e.g. 32-bit DH. Context matters. The security of 2048-bit DH versus 1024-bit DH isn't the difference between "one year" and "two

You could never really trust, e.g. 32-bit DH. Context matters. The security of 2048-bit DH versus 1024-bit DH isn't the difference between "one year" and "two years", it's the difference btween "one year" and centuries.