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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. Public key certificate - Wikipedia

   en.wikipedia.org/wiki/Public_key_certificate

   In addition, the certificate authority that issues the client certificate is usually the service provider to which client connects because it is the provider that needs to perform authentication. Some service providers even offer free SSL certificates as part of their packages. [5]

4. GeoTrust - Wikipedia

   en.wikipedia.org/wiki/GeoTrust

   GeoTrust was the first certificate authority [2] to use the domain-validated certificate method which accounts for 70 percent of all SSL certificates on the Internet. [3] [4] By 2006, GeoTrust was the 2nd largest certificate authority in the world with 26.7 percent market share according to independent survey company Netcraft. [5]

5. 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]

6. 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 ...

7. Version history for TLS/SSL support in web browsers

   en.wikipedia.org/.../SSL_support_in_web_browsers

   EV certificate SHA-2 certificate ECDSA certificate BEAST CRIME POODLE (SSLv3) RC4 FREAK Logjam Protocol selection by user Microsoft Internet Explorer (1–10) [n 20] Windows Schannel: 1.x: Windows 3.1, 95, NT, [n 21] [n 22] Mac OS 7, 8: No SSL/TLS support 2: Yes No No No No No No No No No SSL 3.0 or TLS support Vulnerable Vulnerable Vulnerable ...