SPKI questions (computing, overlapping values)

[Phil]

I believe this answers your remaining question.

@jsha

It’s worth noting that “Let’s Encrypt Authority X3” and “Let’s Encrypt Authority X4” will have the same public keys as “Let’s Encrypt Authority X1” and “Let’s Encrypt Authority X2,” respectively. We issued the new certificates using our existing keys so that we would not have to delay Windows XP support until our next key ceremony (currently unscheduled).