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gnupg: Glossary

 
 Glossary
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 'ARL'
      The _Authority Revocation List_ is technical identical to a CRL but
      used for CAs and not for end user certificates.
 
 'Chain model'
      Verification model for X.509 which uses the creation date of a
      signature as the date the validation starts and in turn checks that
      each certificate has been issued within the time frame, the issuing
      certificate was valid.  This allows the verification of signatures
      after the CA's certificate expired.  The validation test also
      required an online check of the certificate status.  The chain
      model is required by the German signature law.  See also _Shell
      model_.
 
 'CMS'
      The _Cryptographic Message Standard_ describes a message format for
      encryption and digital signing.  It is closely related to the X.509
      certificate format.  CMS was formerly known under the name 'PKCS#7'
      and is described by 'RFC3369'.
 
 'CRL'
      The _Certificate Revocation List_ is a list containing certificates
      revoked by the issuer.
 
 'CSR'
      The _Certificate Signing Request_ is a message send to a CA to ask
      them to issue a new certificate.  The data format of such a signing
      request is called PCKS#10.
 
 'OpenPGP'
      A data format used to build a PKI and to exchange encrypted or
      signed messages.  In contrast to X.509, OpenPGP also includes the
      message format but does not explicitly demand a specific PKI.
      However any kind of PKI may be build upon the OpenPGP protocol.
 
 'Keygrip'
      This term is used by GnuPG to describe a 20 byte hash value used to
      identify a certain key without referencing to a concrete protocol.
      It is used internally to access a private key.  Usually it is shown
      and entered as a 40 character hexadecimal formatted string.
 
 'OCSP'
      The _Online Certificate Status Protocol_ is used as an alternative
      to a CRL.  It is described in 'RFC 2560'.
 
 'PSE'
      The _Personal Security Environment_ describes a database to store
      private keys.  This is either a smartcard or a collection of files
      on a disk; the latter is often called a Soft-PSE.
 
 'Shell model'
      The standard model for validation of certificates under X.509.  At
      the time of the verification all certificates must be valid and not
      expired.  See also _Chain model_.
 
 'X.509'
      Description of a PKI used with CMS. It is for example defined by
      'RFC3280'.
 

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