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Public-Key Infrastructures and the X.509 Standard
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Most encrypted data ends up being transferred to other entities, so it is crucial that the data follow a standard format, syntax, and encoding so that it makes sense to other users or applications. We ve talked about how the X.509 standard provides such a format. In this section we explain the X.509 rules for data syntax and encoding. The syntax for all certificates that conform to the X.509 standard are expressed using a special notation known as Abstract Syntax Notation 1 (ASN.1), which was originally created by Open Systems Interconnection (OSI) for use with various X.500 protocols. ASN.1 describes the syntax for various data structures, providing well-defined primitive objects as well as a means to define complex combinations of those primitives. ASN.1 has two sets of rules that govern encoding. Basic Encoding Rules (BER, defined in X.690) are a way of representing ASN.1-specified objects as strings of 1 s and 0 s. Distinguished Encoding Rules (DER), a subset of BER, provide a means to uniquely encode each ASN.1 value.
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For more information about these rules, see Appendix B, which includes a copy of RSA Laboratories A Layman s Guide to a Subset of ASN.1, BER, and DER.
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The Components of a PKI
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As we ve mentioned, CAs serve as trusted third parties to bind an individual s identity to his or her public key. CAs issue certificates that contain the user s name, public key, and other identifying information. Signed by the CA, these certificates are stored in public directories and can be retrieved to verify signatures or encrypt documents. A public-key infrastructure involves a collaborative process between several entities: the CA, a registration authority (RA), a certificate repository, a key recovery server, and the end user. In this section we discuss each of these components in detail.
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If we think of a certificate as being similar to a driver s license, the CA operates as a kind of licensing bureau analogous to a state s Department of Motor Vehicles or similar agency. In a PKI, a CA issues, manages, and revokes certificates for a community of end users. The CA takes on the tasks of authenticating its end users and then digitally signing the certificate information before disseminating it. The CA is ultimately responsible for the authenticity of its end users. In providing these services, the CA must provide its own public key to all the certified end users as well as all relying parties who may use the certified information. Like end users, the CA provides its public key in the form of a digitally signed certificate. However, the CA s certificate is slightly different in that the Subject and Issuer fields contain the same information. Thus, CA certificates are considered self-signed. CAs fall into to two categories: public and private. Public CAs operate via the Internet, providing certification services to the general public. These CAs certify not only users but also organizations. Private CAs, on the other hand, are usually found within a corporation or other closed network. These CAs tend to license only to end users within their own population, providing their network with stronger authentication and access controls.
Registration Authority
Although an RA can be considered an extended component of a PKI, administrators are discovering that it is a necessity. As the number of end entities increases within a given PKI community, so does the workload placed on a CA. An RA can serve as an intermediate entity between the CA and its end users, assisting the CA in its day-to-day certificate-processing functions. An RA commonly provides these functions:
I I I I I
Accepting and verifying registration information about new registers Generating keys on behalf of end users Accepting and authorizing requests for key backup and recovery Accepting and authorizing requests for certificate revocation Distributing or recovering hardware devices, such as tokens, as needed
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