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Mar 23, 2016 at 6:15 comment added Jenny D To get a certificate that can be used to sign anything and be trusted by everyone? No, not a matter of price,
Mar 22, 2016 at 15:41 comment added ssnape and to get the right certificate is just a matter of price, I think...or not?
Mar 22, 2016 at 15:35 comment added SEJPM @ssnape tools.ietf.org/html/rfc5280#section-4.2.1.9
Mar 22, 2016 at 15:32 comment added ssnape So there is a field in x.509 certificates indicating if the owner of the key can issue other certificates or not? Could you please tell me which one?
Mar 22, 2016 at 15:21 comment added SEJPM @ssnape, they can't. If the CA didn't allow you to issue certificates by not setting the required key usage, the signatures won't be recognized as valid.
Mar 22, 2016 at 15:15 comment added ssnape What does that mean? Once a CA certifies that I am the owner of a certain public key, how can the CA prevent me to use that key to sign whatever I want?
Mar 22, 2016 at 14:57 history answered Jenny D CC BY-SA 3.0