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Management Protocols
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Management protocols assist in the online communication between end users and management within a PKI. For example, a management protocol might be used to communicate between an RA and an end user or between two CAs that cross-certify each other. Examples of PKI management protocols include Certificate Management Protocol (CMP) and mes-
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Public-Key Infrastructures and the X.509 Standard
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sage formats such as Certificate Management Message Format (CMMF) and PKCS 10. Management protocols should support the following functions:
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Registration This is the process whereby a user first makes herself or himself known to a CA (directly or through an RA). Initialization Before an end user system can operate securely, it is necessary to install key materials that have the appropriate relationship with keys stored elsewhere in the infrastructure. For example, the end-user system must be securely initialized with the public key and other assured information of the trusted CA(s), to be used in validating certificate paths. Furthermore, a client typically must be initialized with its own key pair(s). Certification This is the process in which a CA issues a certificate for a user s public key and then either returns the certificate to the end user s client system or posts the certificate in a repository (or both). Key recovery As an option, end user client key materials (for example, a user s private key used for encryption purposes) can be backed up by a CA or a key backup system. If a user needs to recover these backed-up key materials (for example, as a result of a forgotten password or a lost key chain file), an online protocol exchange may be needed to support such recovery. Key update All key pairs must be updated regularly. In this process, key pairs are replaced and new certificates are issued. Revocation This process is invoked when an authorized person advises a CA of an abnormal situation requiring certificate revocation. Cross-certification Two CAs exchange information used in establishing a cross-certificate. A cross-certificate is a certificate issued by one CA to another CA that contains a CA signature key used for issuing certificates.
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Online protocols are not the only way to implement these functions. Offline methods can also be used.
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Operational Protocols
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Operational protocols are those protocols that enable the transfer of certificates and revocation status information between directories, end users, and relying parties. The X.509 standard does not specify any single protocol for use within a PKI domain. Instead, the standard specifies how the data should be structured for transport. The following protocols are commonly used within an environment: HTTP, FTP, e-mail, and LDAP. Figure 6-2 illustrates the ways in which the various components of PKI interact.
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Figure 6-2 The interaction between the various PKI components
(3) Key recovery server Certification authority (CA) (2) (5) (4) X.500 directory
Registration authority (RA) (1) (6)
End users
Registering and Issuing Certificates
CAs can register end users in various ways, often depending greatly on the environment. Many end users simply register with the CA or RA via the Internet using a Web browser. A private corporate PKI may use an automated system to register newly hired employees. In either case, registration is one of the most important processes in a PKI. It is at this point that the end user and the CA establish trust.
Public-Key Infrastructures and the X.509 Standard
Depending on the type of certificate being issued, each party may go to great lengths to validate the other. For its part, the end user may review the CA s published certificate policies and certification practice statements. For the CA to establish trust with the end user, the CA may require financial documentation and proof of identity through in-person communications. After registration is complete and a relationship of trust has been established between the CA and the end user, a certificate request can be initiated. One of two approaches can be used. The end user generates a key pair and provides the public key in the form of a standard PKCS 10 certificate-signing request (CSR), or the CA can generate a key pair on behalf of the end user.
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