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Figure 6-2 The PKIX model
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designated by the CA The RA can, in fact, be a component of the CA rather than a separate component The final component of the PKIX model is the repository, a system or group of distributed systems that provide certificates and certificate revocation lists to the end-entities
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Now that we have looked at how PKIX views the world, let s take a look at what PKIX does Using X509 v3, the PKIX working group addresses five major areas: PKIX outlines certificate extensions and content not covered by X509 v3 and the format of version 2 CRLs, thus providing compatibility standards for sharing certificates and CRLs between CAs and end-entities in different PKIs The PKIX profile of the X509 v3 PKC describes the contents, required extensions, optional extensions, and extensions that need not be implemented The PKIX profile suggests a range of values for many extensions In addition, PKIX provides a profile for version 2 CRLs, allowing different PKIs to share revocation information (For more information on PKIX, see Internet X509 Public Key Infrastructure Certificate and CRL Profile [RFC 5280]) PKIX provides certificate management message formats and protocols, defining the data structures, management messages, and management functions for PKIs The working group also addresses the assumptions and restrictions of their protocols This standard identifies the protocols necessary to support online interactions between entities in the PKIX model The management protocols support functions for entity registration, initialization of the certificate (possibly key-pair generation), issuance of the certificate, key-pair update, certificate revocation, cross-certification (between CAs), and key-pair recovery if available PKIX outlines certificate policies and certification practices statements (CPSs), establishing the relationship between policies and CPSs A policy is a set of rules that helps determine the applicability of a certificate to an end-entity For example, a certificate for handling routine information would probably have a policy on creation, storage, and management of key pairs quite different from a policy for certificates used in financial transactions, due to the sensitivity of the financial information A CPS explains the practices used by a CA to issue certificates In other words, the CPS is the method used to get the certificate, while the policy defines some characteristics of the certificate and how it will be handled and used PKIX specifies operational protocols, defining the protocols for certificate handling In particular, protocol definitions are specified for using File Transfer Protocol (FTP) and Hypertext Transfer Protocol (HTTP) to retrieve certificates from repositories These are the most common protocols for applications to use when retrieving certificates
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6: Standards and Protocols
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PKIX includes time-stamping and data certification and validation services, which are areas of interest to the PKIX working group, and which will probably grow in use over time A time stamp authority (TSA) certifies that a particular entity existed at a particular time A Data Validation and Certification Server certifies the validity of signed documents, PKCs, and the possession or existence of data These capabilities support nonrepudiation requirements and are considered building blocks for a nonrepudiation service PART II PKCs are the most commonly used certificates, but the PKIX working group has been working on two other types of certificates: Attribute Certificates and Qualified Certificates An Attribute Certificate (AC) is used to grant permissions using rule-based, rolebased, and rank-based access controls ACs are used to implement a privilege management infrastructure (PMI) In a PMI, an entity (user, program, system, and so on) is typically identified as a client to a server using a PKC There are then two possibilities: either the identified client pushes an AC to the server, or the server can query a trusted repository to retrieve the attributes of the client This situation is modeled in Figure 6-3 The client push of the AC has the effect of improving performance, but no independent verification of the client s permissions is initiated by the server The alternative is to have the server pull the information from an AC issuer or a repository This method is preferable from a security standpoint, because the server or server s domain determines the client s access rights The pull method has the added benefit of requiring no changes to the client software The Qualified Certificate (QC) is based on the term used within the European Commission to identify certificates with specific legislative uses This concept is generalized in the PKIX QC profile to indicate a certificate used to identify a specific individual (a single human rather than the entity of the PKC) with a high level of assurance in a nonrepudiation service Table 6-1 summarizes the Internet Requests for Comment (RFCs) that have been produced by the PKIX working group for each of these five areas
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