Dekódování certifikátu

openssl x509 -text -noout -in certificate.crt
openssl crl -inform DEM -text -noout -in certificate.crt

formát certifikátu:

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----



https://www.sslmentor.cz/napoveda/formaty-certifikatu