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2. Let's Encrypt - Wikipedia

   en.wikipedia.org/wiki/Let's_Encrypt

   Let's Encrypt is a non-profit certificate authority run by Internet Security Research Group (ISRG) that provides X.509 certificates for Transport Layer Security (TLS) encryption at no charge. 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.

3. HTTPS - Wikipedia

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

   A number of commercial certificate authorities exist, offering paid-for SSL/TLS certificates of a number of types, including Extended Validation Certificates. Let's Encrypt, launched in April 2016, [27] provides free and automated service that delivers basic SSL/TLS certificates to websites. [28]

4. DigiCert - Wikipedia

   en.wikipedia.org/wiki/DigiCert

   DigiCert provides public key infrastructure (PKI) and validation required for issuing digital certificates or TLS/SSL certificates, acting as a certificate authority (CA) and trusted third party. History

5. 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]

6. 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.

7. How AOL uses SSL to protect your account

   help.aol.com/articles/how-aol-uses-ssl-to...

   SSL (Secure Sockets Layer) is an industry standard for encrypting private data sent over the Internet. It helps protect your account from hackers and insures the security of private data sent over the Internet, like credit cards and passwords.

8. X.509 - Wikipedia

   en.wikipedia.org/wiki/X.509

   In cryptography, X.509 is an International Telecommunication Union (ITU) standard defining the format of public key certificates. [1] X.509 certificates are used in many Internet protocols, including TLS/SSL, which is the basis for HTTPS, [2] the secure protocol for browsing the web.

9. Transport Layer Security - Wikipedia

   en.wikipedia.org/wiki/Transport_Layer_Security

   Transport Layer Security (TLS) is a cryptographic protocol designed to provide communications security over a computer network, such as the Internet.The protocol is widely used in applications such as email, instant messaging, and voice over IP, but its use in securing HTTPS remains the most publicly visible.