Delegated Path Discovery
Trusted-server-querying method for public key certificate information
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Delegated Path Discovery (DPD) is a method for querying a trusted server for information about a public key certificate.
DPD allows clients to obtain collated certificate information from a trusted DPD server. This information may then be used by the client to validate the subject certificate.
The requirements for DPD are described in RFC 3379. [1]
