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2. Let's Encrypt - Wikipedia

   en.wikipedia.org/wiki/Let's_Encrypt

   Download QR code; Print/export ... Inc., Facebook, Google Chrome, The Internet ... improvements to the certificate ecosystem that provide free certificates for all ...

3. HTTPS - Wikipedia

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

   This is an accepted version of this page This is the latest accepted revision, reviewed on 4 March 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 ...

4. Public key certificate - Wikipedia

   en.wikipedia.org/wiki/Public_key_certificate

   In cryptography, a public key certificate, also known as a digital certificate or identity certificate, is an electronic document used to prove the validity of a public key. [ 1 ] [ 2 ] The certificate includes the public key and information about it, information about the identity of its owner (called the subject), and the digital signature of ...

5. Public key infrastructure - Wikipedia

   en.wikipedia.org/wiki/Public_key_infrastructure

   Some argue that purchasing certificates for securing websites by SSL/TLS and securing software by code signing is a costly venture for small businesses. [41] However, the emergence of free alternatives, such as Let's Encrypt, has changed this.

6. Certificate authority - Wikipedia

   en.wikipedia.org/wiki/Certificate_authority

   In 2015, a Chinese certificate authority named MCS Holdings and affiliated with China's central domain registry issued unauthorized certificates for Google domains. [ 54 ] [ 55 ] Google thus removed both MCS and the root certificate authority from Chrome and have revoked the certificates.

7. Certificate Transparency - Wikipedia

   en.wikipedia.org/wiki/Certificate_Transparency

   Certificates that support certificate transparency must include one or more signed certificate timestamps (SCTs), which is a promise from a log operator to include the certificate in their log within a maximum merge delay (MMD). [4] [3] At some point within the maximum merge delay, the log operator adds the certificate to their log.

8. Automatic Certificate Management Environment - Wikipedia

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

   The ISRG provides free and open-source reference implementations for ACME: certbot is a Python-based implementation of server certificate management software using the ACME protocol, [6] [7] [8] and boulder is a certificate authority implementation, written in Go. [9] Since 2015 a large variety of client options have appeared for all operating ...

9. Root certificate - Wikipedia

   en.wikipedia.org/wiki/Root_certificate

   A root certificate is the top-most certificate of the tree, the private key which is used to "sign" other certificates. All certificates signed by the root certificate, with the "CA" field set to true, inherit the trustworthiness of the root certificate—a signature by a root certificate is somewhat analogous to "notarizing" identity in the ...