The PKI Resource Query Protocol (PRQP) is an Internet protocol used for obtaining information about services associated with a X.509 Certification Authority. It is described in a draft document from the PKIX working group and is on the Experimental track. It was created by Massimiliano Pala to solve Interoperability and Usabilities issues among PKIs, specifically addressing certain problems associated with finding services and data repositories associated with a CA. Messages communicated via PRQP are encoded in ASN.1 and are usually communicated over HTTP.
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... an easily configurable PKI discovery service ... The basic idea is to have the client query the DNS for a specific SRV record ... The problem in the adoption of this mechanism is that in PKIs (unlike DNS) there is usually no fixed requirement for the name space used ...
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