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  2. Certified emission reduction - Wikipedia

    en.wikipedia.org/wiki/Certified_Emission_Reduction

    Certified emission reduction units (CERs) by country of origin October 2012 Certified emission reduction units (CERs) monthly spot prices 2012. Certified emission reductions (CERs) originally designed a type of emissions unit (or carbon credits) issued by the Clean Development Mechanism (CDM) Executive Board for emission reductions achieved by CDM projects and verified by a DOE (Designated ...

  3. X.509 - Wikipedia

    en.wikipedia.org/wiki/X.509

    The last certificate in the list is a trust anchor: a certificate that you trust because it was delivered to you by some trustworthy procedure; Certificate chains are used in order to check that the public key (PK) contained in a target certificate (the first certificate in the chain) and other data contained in it effectively belongs to its ...

  4. Self-signed certificate - Wikipedia

    en.wikipedia.org/wiki/Self-signed_certificate

    When the certificate is presented for an entity to validate, they first verify the hash of the certificate matches the reference hash in the white-list, and if they match (indicating the self-signed certificate is the same as the one that was formerly trusted) then the certificate's validity dates can be trusted.

  5. 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 ...

  6. Let's Encrypt - Wikipedia

    en.wikipedia.org/wiki/Let's_Encrypt

    The root certificate was used to sign two intermediate certificates, [44] which are also cross-signed by the certificate authority IdenTrust. [7] [45] One of the intermediate certificates is used to sign issued certificates, while the other is kept offline as a backup in case of problems with the first intermediate certificate. [44]

  7. Certificate signing request - Wikipedia

    en.wikipedia.org/wiki/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 certificate should be issued ...

  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. Certificate authority - Wikipedia

    en.wikipedia.org/wiki/Certificate_authority

    In cryptography, a certificate authority or certification authority (CA) is an entity that stores, signs, and issues digital certificates. A digital certificate ...