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2. 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.

3. 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 ...

4. Certificate authority - Wikipedia

   en.wikipedia.org/wiki/Certificate_authority

   Worldwide, the certificate authority business is fragmented, with national or regional providers dominating their home market. This is because many uses of digital certificates, such as for legally binding digital signatures, are linked to local law, regulations, and accreditation schemes for certificate authorities.

5. DigiCert - Wikipedia

   en.wikipedia.org/wiki/DigiCert

   In 2007, DigiCert partnered with Microsoft to develop the industry's first multi-domain (SAN) certificate. [10] In 2015, DigiCert acquired the CyberTrust Enterprise SSL business from Verizon Enterprise Solutions, becoming the world's second-largest certificate authority for high-assurance or extended validation (EV) TLS/SSL certificates. [11]

6. Verisign - Wikipedia

   en.wikipedia.org/wiki/VeriSign

   Verisign, Inc. is an American company based in Reston, Virginia, that operates a diverse array of network infrastructure, including two of the Internet's thirteen root nameservers, the authoritative registry for the .com, .net, and .name generic top-level domains and the .cc country-code top-level domains, and the back-end systems for the .jobs and .edu sponsored top-level domains.

7. Self-signed certificate - Wikipedia

   en.wikipedia.org/wiki/Self-signed_certificate

   RFC 5280 defines self-signed certificates as "self-issued certificates where the digital signature may be verified by the public key bound into the certificate" [7] whereas a self-issued certificate is a certificate "in which the issuer and subject are the same entity". While in the strict sense the RFC makes this definition only for CA ...