How do you do revocation or software updates securely if your current signature algorithm is compromised?

As a practical matter, revocation on the Web is handled mostly by centrally distributed revocation lists (CRLsets, CRLite, etc. [0]), so all you really need is:

(1) A PQ-secure way of getting the CRLs to the browser vendors. (2) a PQ-secure update channel.

Neither of these require broad scale deployment.

However, the more serious problem is that if you have a setting where most servers do not have PQ certificates, then disabling the non-PQ certificates means that lots of servers can't do secure connections at all. This obviously causes a lot of breakage and, depending on the actual vulnerability of the non-PQ algorithms, might not be good for security either, especially if people fall back to insecure HTTP.

See: https://educatedguesswork.org/posts/pq-emergency/ and https://www.chromium.org/Home/chromium-security/post-quantum...

[0] The situation is worse for Apple.

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FiloSottile 3 hours ago | parent [-]

Indeed, in an open system like the WebPKI it's fine in theory to only make the central authority PQ, but then you have the ecosystem adoption issue. In a closed system, you don't have the adoption issue, but the benefit to making only the central authority PQ is likely to be a lot smaller, because it might actually be the only authority. In both cases, you need to start moving now and gain little from trying to time the switchover.

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ekr____ 3 hours ago | parent [-]

> In both cases, you need to start moving now and gain little from trying to time the switchover.

There are a number of "you"s here, including:

- The SDOs specifying the algorithms (IETF mostly)

- CABF adding the algorithms to the Baseline Requirements so they can be used in the WebPKI

- The HSM vendors adding support for the algorithms

- CAs adding PQ roots

- Browsers accepting them

- Sites deploying them

This is a very long supply line and the earlier players do indeed need to make progress. I'm less sure how helpful it is for individual sites to add PQ certificates right now. As long as clients will still accept non-PQ algorithms for those sites, there isn't much security benefit so most of what you are doing is getting some experience for when you really need it. There are obvious performance reasons not to actually have most of your handshakes use PQ certificates until you really have to.

	▲	FiloSottile 2 hours ago \| parent [-]
		Yeah, that's an audience mismatch, this article is for "us." End users of cryptography, including website operators and passkey users (https://news.ycombinator.com/item?id=47664744) can't do much right now, because "we" still need to finish our side.