Background
At present, ever more services and protocols are being defined to address different needs of users and administrators in PKIs. With the deployment of new applications and services, the need to access PKI resources provided by different organizations is critical. Each application needs to be told about how to find these services for each new certificate it encounters. Therefore, each application needs to be properly configured by filling in complex configuration options whose meaning is mostly unknown to the average user (and likely to the administrator as well).
The PRQP Protocol addresses these interoperability and trust building issues among separate PKI islands. In fact, it provides a dynamic method capable to provide more timely information about provided services and available PKI resources. It can also be used to help in painless rollover between services, e.g. switching from CRLs to OCSP for certificate validation. Moreover, PRQP allows PKI management to dynamically choose which services are to be provided based on the faced challenges during infrastructure deployment. In other words, PRQP can be thought to be similar (in concept) to a DNS for PKI resources.
Read more about this topic: PKI Resource Query Protocol
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