A Warm Welcome to ASN.1 and DER
https://letsencrypt.org/docs/a-warm-welcome-to-asn1-and-der/ [letsencrypt.org]
2020-04-28 00:35
This document provides a gentle introduction to the data structures and formats that define the certificates used in HTTPS. It should be accessible to anyone with a little bit of computer science experience and a bit of familiarity with certificates.
“Gentle.”
source: L