Collaborate Disseminate
Say that I have generated an RSA keypair, which I intend to publish only for use with RSA-KEM; I can see that this is provisioned for:
The intended application for the key MAY be indicated in the key usage certificate extension (see RFC 5… Continue reading Does self-signed encryption certificate violate "no multi-use keys" principle?
I understand how Key Usage Extension of x.509 certificate works. I have gone through the Key Usage section of RFC5280 and I know of all the valid values and what they mean.
But what I don’t understand is the usage; Why it was deem necessar… Continue reading application of key usage extension
I have gone through multiple questions but still I am confused. RFC X.509 also does not clarify it.
Conforming CAs MUST include this extension in certificates that
contain public keys that are used to validate digital signatures on
… Continue reading Is it must to have "Key Usage" extension in the selfsigned root certificate?
I want to understand if Openssl supports the key usage extension validation. If yes, how does it understand that each certificate in the chain received in server certificate correctly specifies the key usage ?
Continue reading Does Openssl support server certificate key usage validation during Tls handshake?
I configured a Windows CA and created a certificate template to issue certificates with ECDH_P384 keys:
Then I noticed that it’s not possible to set the “Key Encipherment” key usage in the “Extensions” tab:
What is the reason behind … Continue reading Does the "Key Encipherment" key usage make sense when using ECDH P384?
we have a CA certificate template to verify, which contains an extendedkeyusage extension with the following values
“clientAuthentication”
“emailProtection” and
“id-kp-OCSPSigning”
Is this a mistake or is there really a usecase for e… Continue reading what is the usage of extendedkeyusage in a CA certificate?
We are considering creating timestamped PKCS#7 detached signatures for our backup files for audit purposes (timestamp would be created by an external trusted TSA). Which extended key usage (EKU) attributes, if any, should be … Continue reading Extended key usage attributes for PKCS#7 signatures of backup files
In the context of SSL/TLS certificates, what is the difference between key encipherment and data encipherment? What are some examples that highlights the difference?
Continue reading Difference between key encipherment and data encipherment?
Web browsers are off course checking that field, but some third party libraries for languages like perl don’t perform it (they check /keyUsage= but not /extendedKeyUsage=).
So for example, I would need a certificate authorit… Continue reading How test if a tool doesn’t check for /extendedKeyUsage=?
In Windows certificate store, an intermediate CA certificate without Key Usage extension is considered eligible (as long as it has isCA flag from Basic Constraints of course) for singing end entity certificates (such chain is… Continue reading Missing ‘Key Usage’ on a CA certificate: can sign certificates?