🔐
https://jamielinux.com/docs/openssl-certificate-authority/certificate-revocation-lists.html
https://raymii.org/s/articles/OpenSSL_manually_verify_a_certificate_against_a_CRL.html
https://www.digicert.com/kb/ssl-support/pem-ssl-creation.htm
https://serverfault.com/questions/9708/what-is-a-pem-file-and-how-does-it-differ-from-other-openssl-generated-key-file
https://www.namecheap.com/support/knowledgebase/article.aspx/9968/38/how-to-check-the-certificate-revocation-status
https://stackoverflow.com/questions/51970569/openssl-cli-verify-crl-of-an-entire-certification-chain
Alternatives
BearSSL very small
...comparisons
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