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2. Public key infrastructure - Wikipedia

   en.wikipedia.org/wiki/Public_key_infrastructure

   A public key infrastructure (PKI) is a set of roles, policies, hardware, software and procedures needed to create, manage, distribute, use, store and revoke digital certificates and manage public-key encryption.

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

4. Type certificate - Wikipedia

   en.wikipedia.org/wiki/Type_certificate

   A type certificate (TC) is issued to signify the airworthiness of the approved design or "type" of an aircraft to be manufactured. The TC is issued by a regulatory authority, and once issued, the design cannot be changed unless at least part of the process for certification is repeated to cover the changes. The TC reflects a determination made ...

5. Certificate of occupancy - Wikipedia

   en.wikipedia.org/wiki/Certificate_of_occupancy

   Certificate of occupancy. A certificate of occupancy is a document issued by a local government agency or building department certifying a building's compliance with applicable building codes and other laws, and indicating it to be in a condition suitable for occupancy. [1]

6. Product certification - Wikipedia

   en.wikipedia.org/wiki/Product_certification

   product certifications (many nations) Product certification or product qualification is the process of certifying that a certain product has passed performance tests and quality assurance tests, and meets qualification criteria stipulated in contracts, regulations, or specifications (sometimes called "certification schemes" in the product ...

7. Certificate-based encryption - Wikipedia

   en.wikipedia.org/wiki/Certificate-based_encryption

   Certificate-based encryption is a system in which a certificate authority uses ID-based cryptography to produce a certificate. This system gives the users both implicit and explicit certification, the certificate can be used as a conventional certificate (for signatures, etc.), but also implicitly for the purpose of encryption.