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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 300 million websites, [4] with the goal of all websites being secure and using HTTPS.

3. Certificate signing request - Wikipedia

   en.wikipedia.org/wiki/Certificate_signing_request

   Certificate signing request. In public key infrastructure (PKI) systems, a certificate signing request ( CSR or certification request) is a message sent from an applicant to a certificate authority of the public key infrastructure (PKI) in order to apply for a digital identity certificate. The CSR usually contains the public key for which the ...

4. Wildcard certificate - Wikipedia

   en.wikipedia.org/wiki/Wildcard_certificate

   Wildcard certificate. A public key certificate which uses an asterisk * (the wildcard) in its domain name fragment is called a Wildcard certificate. Through the use of *, a single certificate may be used for multiple sub-domains . It is commonly used for transport layer security in computer networking .

5. Certificate authority - Wikipedia

   en.wikipedia.org/wiki/Certificate_authority

   Certificate authority. In cryptography, a certificate authority or certification authority ( CA) is an entity that stores, signs, and issues digital certificates. A digital certificate certifies the ownership of a public key by the named subject of the certificate. This allows others (relying parties) to rely upon signatures or on assertions ...

6. X.509 - Wikipedia

   en.wikipedia.org/wiki/X.509

   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. They are also used in offline applications, like ...

7. Cold War Recognition Certificate - Wikipedia

   en.wikipedia.org/wiki/Cold_War_Recognition...

   The Cold War Recognition Certificate was authorized by the United States Congress in 1997 to recognize "all members of the Armed Forces and qualified Federal government civilian personnel who faithfully and honorably served the United States during the Cold War Era from September 2, 1945, to December 26, 1991". [1]