X.509 certificate
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X.509 certificate is an abstract certificate format used with X.509 public key encryption systems.
Certificates supply the public key of somebody you wish to communicate with securely, such as a client or vendor. They are used in electronic transaction processing, for instance. You may need to install a vendor's certificate file on your system in order to send transactions such as credit card sales to be processed.
An X.509 certificate may be stored in a number of different file formats, such as:
See also RSA private key.
