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Gradually sunsetting SHA-1

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Re: Gradually sunsetting SHA-1

#21

This deprecation policy appears to affect some (possibly all) Startcom SSL certificates, which are chained through "StartCom Class 1 Primary Intermediate Server CA", which is signed with SHA1 and expires on 2017-10-24.

It specifically says the dates apply to the end entity . They're not trying to get people off SHA1 in a couple months, they're trying to get them off in a year or two.

> and which include a SHA-1-based signature as part of the certificate chain

Re: Gradually sunsetting SHA-1

#22

This deprecation policy appears to affect some (possibly all) Startcom SSL certificates, which are chained through "StartCom Class 1 Primary Intermediate Server CA", which is signed with SHA1 and expires on 2017-10-24.

It specifically says the dates apply to the end entity . They're not trying to get people off SHA1 in a couple months, they're trying to get them off in a year or two.

It also says "[...] which include a SHA-1-based signature as part of the certificate chain". In other words, SHA1 is deprecated in the entire chain (minus the root, where the signature is irrelevant).

Re: Gradually sunsetting SHA-1

#24
post #22

Earlier quoted context omitted.

It specifically says the dates apply to the end entity . They're not trying to get people off SHA1 in a couple months, they're trying to get them off in a year or two.

It also says "[...] which include a SHA-1-based signature as part of the certificate chain". In other words, SHA1 is deprecated in the entire chain (minus the root, where the signature is irrelevant).

The root could be SHA1 valid until 2050 and it wouldn't matter. Your bog-standard certificate is valid for one year, and you don't have to care until you're renewing.

Re: Gradually sunsetting SHA-1

#25
post #19

This deprecation policy appears to affect some (possibly all) Startcom SSL certificates, which are chained through "StartCom Class 1 Primary Intermediate Server CA", which is signed with SHA1 and expires on 2017-10-24.

Yes, this is going to further insecure the Internet by forcing people back to the for-pay CAs, unless Startcom manages to fix it basically instantly and forces everyone to get new certs, very very quickly.

Nope, free certificates don't have expiration dates in 2016 or 2017 or later.

Re: Gradually sunsetting SHA-1

#26
post #4

The problem i have with their "neutral, lacking security" icon is that it does not indicate that anything is wrong when in fact there is. https:// should never have a neutral icon. it should be VALID or INVALID.

At some point in the not-too-distant future, anything other than full 100% verified HTTPS should have a red "danger" icon.

Re: Gradually sunsetting SHA-1

#27
post #19

Earlier quoted context omitted.

Yes, this is going to further insecure the Internet by forcing people back to the for-pay CAs, unless Startcom manages to fix it basically instantly and forces everyone to get new certs, very very quickly.

Nope, free certificates don't have expiration dates in 2016 or 2017 or later.

As I understood it any certificate in the chain (except the root) is considered. Validity is usually longer for intermediate certificates [such as the Starcom intermediary, quoted above].

Re: Gradually sunsetting SHA-1

#28

This deprecation policy appears to affect some (possibly all) Startcom SSL certificates, which are chained through "StartCom Class 1 Primary Intermediate Server CA", which is signed with SHA1 and expires on 2017-10-24.

It specifically says the dates apply to the end entity . They're not trying to get people off SHA1 in a couple months, they're trying to get them off in a year or two.

Just to clarify: the other replies are correct. The logic is that if the leaf certificate has an expiry after Dec 31st, 2015 then the whole chain must be SHA-256. If the leaf expires before that, then other certificates in the chain don't matter.

If you have a one year certificate (and I always recommend getting one year certificates so that these issues don't affect you and so that renewal becomes an annual chore, not an irregular panic) then you don't have to worry.

StartSSL simply need to cut new intermediates, signed with SHA-256, and provide them to customers once the leaf certificates that they issue start to stretch into 2016.

Re: Gradually sunsetting SHA-1

#29
I'm concerned that the net effect of this will be to make the Internet less secure. In most cases, webmasters will be forced to make a Faustian choice: live with the scary warning in Chrome for modern users or give up support of browsers running on Windows XP (pre-SP3) and early versions of Android (pre-2.3), since they don't support certificates with a more secure hash than SHA1. We'll likely write a blog post soon on how much of the Internet still uses these old browsers. It's a startling amount. While it's unlikely to be the parts of the web where Google generates a large amount of ad revenue (e.g., China), so perhaps they don't care, I am concerned the net effect will be a web that is actually less secure.

At CloudFlare, we have a plan to handle this gracefully for our customers (with both modern Chrome and old OSs) ahead of the change, but it's a non-trivial engineering challenge that many organizations won't make. I worry that, faced with the choice above, many organizations will simply opt not to support HTTPS at all. And, from my vantage point, that's a bigger risk to web security today than certificates signed with a SHA1 hash.

Re: Gradually sunsetting SHA-1

#30

Mozilla and IE should adopt similar policies, and not just for SHA1 deprecation, but for other weak security protocols, too. If website A uses much weaker security than website B, they shouldn't be treated equally by the browser. Reward the ones who embrace stronger security, punish (within reason, and gradually) those who don't.

Firefox Bug 942515 - stop accepting SHA-1-based SSL certificates with notBefore >= 2014-03-01 and notAfter >= 2017-01-01, or any SHA-1-based SSL certificates after 2017-01-01

https://bugzil.la/942515

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