We studied RFC5280 and we look into it once again. As you notice GoDaddy 
issues 17 different CRLs signed all with one certificate and the same pair 
of keys. It’s a little bit different situation than we have.
It looks that Mozilla and Internet Explorer deal properly with our CRLs 
without IDP extension. While you want to connect with our test web page 
https://revoked.elektronicznypodpis.pl/ , which has a revoked certificate 
you get an error: sec_error_revoked_certificate. IE also finds our 
certificate as revoked. For Mozilla OCSP is priority as it is mentioned in 
BR, so I’m not sure that IDP is absolutely needed in our CRLs.

Regards



Od:     Erwann Abalea <[email protected]>
Do:     [email protected], 
Data:   2014-10-07 00:20
Temat:  Re: Re: Re: KIR S.A. Root Inclusion Request
Wysłane przez:  "dev-security-policy" 
<dev-security-policy-bounces+certificates=kir.com...@lists.mozilla.org>



Bonsoir,

Le lundi 6 octobre 2014 15:55:24 UTC+2, Certificates a écrit :
> Thank you for your clarifications. We analysed it, and we add Authority 
> Key Identifier extension to our CRLs. As it it mentioned in s. 5.2.1 RFC 

> 5280 "this extension is  especially useful where an issuer has more than 

> one signing key, either due to multiple concurrent key pairs or due to 
> changeover".  We based the value of this extension on issuer name and 
> serial number. We checked that GoDaddy distinguishes CRLs in the same 
way.
> The CRL for the newer CA certificate is available now here 
> http://www.elektronicznypodpis.pl/crl/trusted_ca_2013.crl. CRL for the 
> elder CA certificate will be available tomorrow.

Please read X.509 or RFC5280 again. AKI is not a way to limit the scope of 
the CRL. AKI is not to be set as a critical extension. AKI is only a 
helper so the RP can avoid guessing which key signed this object. The RP 
has absolutely no obligation to follow this helper.
The ONLY RFC5280-compatible extension to reduce the scope of a CRL is the 
IssuingDistributionPoint.

GoDaddy distinguishes the CRLs not by their AKI, but by the 
IssuingDistributionPoint extension, and this extension MUST be critical 
for its goal to be achieved. BTW, the AKI extension of such partitioned 
CRLs at GoDaddy is identical on all the CRLs (I checked 
http://crl.godaddy.com/gds2-{1,...,17}.crl).
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