https://en.wikipedia.org/wiki/X.509
https://ru.wikipedia.org/wiki/X.509

https://datatracker.ietf.org/doc/html/rfc5280

https://pro-ldap.ru/tr/zytrax/tech/encryption.html#dhe
    diffy-helman

https://pro-ldap.ru/tr/zytrax/tech/ssl.html

formats
ascii pem
ASCII PEM key

libs
https://stackoverflow.com/questions/58724396/parse-x509-certificate-string-in-node
https://www.geeksforgeeks.org/node-js-new-x509certificate-function/
https://pkijs.org/docs/api/pkijs

2023
https://learn.microsoft.com/en-us/azure/iot-hub/reference-x509-certificates
https://learn.microsoft.com/ru-ru/azure/iot-hub/reference-x509-certificates
    !!!
2022
https://www.techtarget.com/searchsecurity/definition/X509-certificate
2018
https://habr.com/ru/articles/346798/
    !!! std, le