this post was submitted on 02 Dec 2025
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Let’s Encrypt will be reducing the validity period of the certificates we issue. We currently issue certificates valid for 90 days, which will be cut in half to 45 days by 2028.
This change is being made along with the rest of the industry, as required by the CA/Browser Forum Baseline Requirements, which set the technical requirements that we must follow. All publicly-trusted Certificate Authorities like Let’s Encrypt will be making similar changes. Reducing how long certificates are valid for helps improve the security of the internet, by limiting the scope of compromise, and making certificate revocation technologies more efficient.

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[–] probable_possum@leminal.space 39 points 23 hours ago* (last edited 23 hours ago) (2 children)

It's the "change your password often odyssey" 2.0. If it is safe, it is safe, it doesn't become unsafe after an arbitrary period of time (if the admin takes care and revokes compromised certs). If it is unsafe by design, the design flaw should be fixed, no?

Or am I missing the point?

[–] LastYearsIrritant@sopuli.xyz 47 points 22 hours ago (2 children)

The point is, if the certificate gets stolen, there's no GOOD mechanism for marking it bad.

If your password gets stolen, only two entities need to be told it's invalid. You and the website the password is for.

If an SSL certificate is stolen, everyone who would potentially use the website need to know, and they need to know before they try to contact the website. SSL certificate revocation is a very difficult communication problem, and it's mostly ignored by browsers because of the major performance issues it brings having to double check SSL certs with a third party.

[–] wildbus8979@sh.itjust.works 1 points 21 hours ago (2 children)
[–] bss03@infosec.pub 1 points 5 hours ago (1 children)

Looks like autoincorrect did a s/CRLs/Carla/ for you.

[–] wildbus8979@sh.itjust.works 1 points 5 hours ago

And that somehow Lemmy didn't federate my deletion!

[–] AtariDump@lemmy.world 1 points 7 hours ago (1 children)
[–] wildbus8979@sh.itjust.works 0 points 7 hours ago (1 children)

How did you reply to a deleted comment?

[–] bss03@infosec.pub 1 points 5 hours ago

Probably the comment has federated to lemmy.world, but the deletion of the comment hasn't yet.

[–] Lyra_Lycan@lemmy.blahaj.zone -4 points 22 hours ago (1 children)

But browsers have a marker for dangerous sites - surely Cloudflare, Amazon or Google should have a report system and deliver warnings at the base

[–] False@lemmy.world 10 points 22 hours ago* (last edited 22 hours ago) (1 children)

Browsers are only a (large) fraction of SSL traffic.

[–] Auli@lemmy.ca 4 points 22 hours ago (1 children)

So is there an example of SSL certs being stolen and used nefariously. Only thing that sticks out to me is certificate authorities being bad.

[–] cron@feddit.org 28 points 22 hours ago (1 children)

Short lifespans are also great when domains change their owner. With a 3 year lifespan, the old owner could possibly still read traffic for a few more years.

When the lifespan ist just 30-90 days, that risk is significatly reduced.

[–] Appoxo@lemmy.dbzer0.com 4 points 16 hours ago (1 children)

Only matters for LE certs.
You can still buy 1 year certs

[–] cron@feddit.org 5 points 13 hours ago (1 children)

For 3 more months or so, you can't buy them in april 2026 anymore

[–] Appoxo@lemmy.dbzer0.com 2 points 12 hours ago (1 children)
[–] Zanathos@lemmy.world 4 points 9 hours ago

They are going down to 200 day expiration in March 2026. You can still buy 5 year certificates today but you still need to reissue them in 365 day cadence.