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2. Automatic Certificate Management Environment - Wikipedia

   en.wikipedia.org/wiki/Automatic_Certificate...

   A major new requirement in v2 is that requests for wildcard certificates require the modification of a Domain Name Service TXT record, verifying control over the domain. Changes to ACME v2 protocol since v1 include: [13] The authorization/issuance flow has changed; JWS request authorization has changed

3. Let's Encrypt - Wikipedia

   en.wikipedia.org/wiki/Let's_Encrypt

   It is the world's largest certificate authority, [3] used by more than 400 million websites, [4] with the goal of all websites being secure and using HTTPS. The Internet Security Research Group (ISRG), the provider of the service, is a public benefit organization. [5]

4. Public key certificate - Wikipedia

   en.wikipedia.org/wiki/Public_key_certificate

   An example of a wildcard certificate on comifuro.net (note the asterisk: *) A public key certificate which uses an asterisk * (the wildcard) in its domain name fragment is called a Wildcard certificate. Through the use of *, a single certificate may be used for multiple sub-domains.

5. Domain-validated certificate - Wikipedia

   en.wikipedia.org/wiki/Domain-validated_certificate

   A domain validated certificate is distinct from an Extended Validation Certificate in that this is the only requirement for issuing the certificate. [3] In particular, domain validated certificates do not assure that any particular legal entity is connected to the certificate, even if the domain name may imply a particular legal entity controls ...

6. Self-signed certificate - Wikipedia

   en.wikipedia.org/wiki/Self-signed_certificate

   For example, the procedure of trusting a self-signed certificate includes a manual verification of validity dates, and a hash of the certificate is incorporated into the white list. [2] When the certificate is presented for an entity to validate, they first verify the hash of the certificate matches the reference hash in the white-list, and if ...

7. Extended Validation Certificate - Wikipedia

   en.wikipedia.org/.../Extended_Validation_Certificate

   An Extended Validation (EV) Certificate is a certificate conforming to X.509 that proves the legal entity of the owner and is signed by a certificate authority key that can issue EV certificates. EV certificates can be used in the same manner as any other X.509 certificates, including securing web communications with HTTPS and signing software ...