Re: Managing Long-Lived CA certs
"Dr. Pala" <[email protected]>
| Newsgroups | gmane.ietf.x509 |
|---|---|
| Organization | OpenCA Labs |
| Message-ID | <[email protected]> |
Hi Rob, I was thinking about that but wouldn't it prevent using the key for other reasons like signing CRLs ? I know you can have a separate CRL signer, but I would like to limit _only_ the issuing of certificates, not other usages. Cheers, Max On 7/17/17 4:49 PM, Rob Stradling wrote: > Hi Max. > > The "Private Key Usage Period" extension was present in RFC2459 and > RFC3280 (see section 4.2.1.4), but was removed in RFC5280. (Well, > mostly removed; the ASN.1 definitions are still in Appendix A.2 ;-) ). > > On 17/07/17 15:19, Dr. Pala wrote: >> Hi PKIX, >> >> I have a small question for the list regarding long-lived CA >> certificates. Especially in the context of device certificates, we >> often see the use of extra long-lived certificates for Root and Sub >> CAs (e.g., 35+ years) combined with limited key sizes (e.g., p256). >> >> Until we have a supported mechanism for reprovisioning devices (...), >> one possible solution for limiting the exposure of the private key >> would be to have a scoped certificate issuance period. >> >> What I am thinking about would be adding an extension that says: >> "This CA can issue certificates from up to 5 years from the >> validFrom, after this, just use it to provide revocation >> information". This might provide some protection in case the CA key >> is compromised after the initial 5 years of validity (e.g., >> certificates issued after that date shall be rejected). >> >> Does such extension exists today ? If not, could this be some work >> for LAMPS/SPASM WG ? >> >> Cheers, >> Max >> >> -- >> Best Regards, >> Massimiliano Pala, Ph.D. >> OpenCA Labs Director >> OpenCA Logo >> >> >> _______________________________________________ >> pkix mailing list >> [email protected] >> https://www.ietf.org/mailman/listinfo/pkix >> > -- Best Regards, Massimiliano Pala, Ph.D. OpenCA Labs Director OpenCA Logo _______________________________________________ pkix mailing list [email protected] https://www.ietf.org/mailman/listinfo/pkix