Certificate Authority ↔ org to Sign Digital Certificate with Public Key

aka CA

Let's Encrypt

non-profit CA provider of free TLS Digital Certificate - automate challenge to Auth Web Server Admin Software to issue cert

References

1. Digital Certificate ↔ Metadata file about org/entity/location to Sign by CA

2. Let's Encrypt ↔ non-profit CA provider of free TLS Digital Certificate - automate challenge to Auth Web Server Admin Software to issue cert