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Public-Key Infrastructures and the X.509 Standard
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RAs are also commonly used for the convenience of end users. As the number of end users increases within a PKI domain, it s likely that they will become more geographically dispersed. CAs can delegate the authority to accept registration information to a local RA. In this way, the CA can be operated as an offline entity, making it less susceptible to attacks by outsiders.
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After a certificate is generated, it must be stored for later use. To relieve end users of the need to store the certificate on local machines, CAs often use a certificate directory, or central storage location. An important component of a PKI, a certificate directory provides a single point for certificate administration and distribution. There is no one required directory standard. Lotus Notes and Microsoft Exchange use proprietary directories, and directories based on the X.500 standard are also gaining popularity. X.500 directories are becoming more widely accepted because in addition to acting as a certificate repository, they give administrators a central location for entry of personal attribute information. Entries might include network resources such as file servers, printers, and URLs. User information, such as e-mail address, telephone privileges, and certificates, is accessible from numerous clients in a controlled fashion. Directory clients can locate entries and their attributes using a directory access protocol such as Lightweight Directory Access Protocol (LDAP). LDAP, defined by RFCs 1777 and 1778, was designed to give applications a means to access X.500 directories. It has been widely adopted because it is simpler and easier to use than the X.500 standard protocols. Because it is not directory-specific, LDAP has also found its way into various environments, enhancing its interoperability.
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Because of the self-verifying nature of certificates, certificate directories themselves do not necessarily have to be trusted. Should a directory be compromised, certificates can still be validated through the standard process of checking the certificate chain through the CA. If the directory server contains personal or corporate data, however, it may be necessary to provide security and access control to it.
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In a PKI population of any size, one thing is sure to happen: End users will lose their private keys. Whether the loss results from hardware failure or a forgotten password, it can create a significant burden on all parties in the PKI. With the loss of a private key, for example, the CA must revoke the corresponding PKC; in addition, a new key pair must be generated, and a new corresponding PKC must be created. As a result, all data encrypted before the incident becomes unrecoverable. One solution is to provide a key recovery server (or, more accurately, a key backup and recovery server). As the name implies, the key recovery server gives the CA a simple way of backing up private keys at the time of creation and recovering them later. Although key recovery servers can save considerable time and money, problems can arise. For example, the key used to decrypt data could be the same key used to sign messages (that is, the user s private key). In this case, an attacker could access the user s private key and forge messages in the user s name. For that reason, some CAs support two key pairs: one for encryption and decryption and another one for signature and verification. We discuss the storage of multiple key pairs later in this chapter in the section titled Managing Multiple Key Pairs.
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The term escrow is sometimes used interchangeably with recovery. There is, however, a clear distinction between the two. A key recovery server is implemented in a given PKI by its administrators to provide recovery functions for end users. In key escrow, on the other hand, a third party (such as a federal or local law enforcement agency) is given keys needed as evidence in an investigation.
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