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2. Internet Security Research Group - Wikipedia

   en.wikipedia.org/wiki/Internet_Security_Research...

   The Internet Security Research Group (ISRG) is a public-benefit non-profit corporation based in California which focuses on Internet security. [2] The group is known for hosting and running the Let's Encrypt service, which aims to make Transport Layer Security (TLS) certificates available for free in an automated fashion. [3]

3. StartCom - Wikipedia

   en.wikipedia.org/wiki/StartCom

   StartCom offered the free Class 1 X.509 SSL certificate "StartSSL Free", which works for webservers as well as for E-mail encryption ().It also offered Class 2 and 3 certificates as well as Extended Validation Certificates, where a comprehensive validation (with costs) was mandatory.

4. Let's Encrypt - Wikipedia

   en.wikipedia.org/wiki/Let's_Encrypt

   Through working with software vendors and contacting site operators, Let's Encrypt was able to get 1.7 million of the affected certificates renewed before the deadline. They ultimately decided not to revoke the remaining affected certificates, as the security risk was low and the certificates were to expire within the next 90 days. [39]

5. CAcert.org - Wikipedia

   en.wikipedia.org/wiki/CAcert.org

   CAcert.org is a community-driven certificate authority that issues free X.509 public key certificates. [1] CAcert.org relies heavily on automation and therefore issues only Domain-validated certificates (and not Extended validation or Organization Validation certificates).

6. OpenSSL - Wikipedia

   en.wikipedia.org/wiki/OpenSSL

   The OpenSSL project was founded in 1998 to provide a free set of encryption tools for the code used on the Internet. It is based on a fork of SSLeay by Eric Andrew Young and Tim Hudson, which unofficially ended development on December 17, 1998, when Young and Hudson both went to work for RSA Security.

7. HTTPS - Wikipedia

   https://en.wikipedia.org/wiki/HTTPS

   This is an accepted version of this page This is the latest accepted revision, reviewed on 24 January 2025. Extension of the HTTP communications protocol to support TLS encryption Internet protocol suite Application layer BGP DHCP (v6) DNS FTP HTTP (HTTP/3) HTTPS IMAP IRC LDAP MGCP MQTT NNTP NTP OSPF POP PTP ONC/RPC RTP RTSP RIP SIP SMTP SNMP SSH Telnet TLS/SSL XMPP more... Transport layer TCP ...