Cryptography - X.509

Certificate Validity Period Not Before Not After Portecle

About

x.509 is the specification / version of a certificate

It's defined in the rfc5280 - Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile

When you see x509, you should think that this is a certificate. For instance openssl has a x509 command to see and signed a certificate




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