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The management of key pairs the policies whereby they are generated and protected is important in any PKI. As described in this section, such policy decisions depend greatly on the intended purpose of the keys. For example, keys that enable nonrepudiation for e-commerce transactions are more likely to be handled with greater care than those used to provide for secure e-mail.
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Keys can be generated in one of two ways. In the first option, key pairs are generated on the end user s system. The second option requires that a trusted third party (such as the CA or its delegated RA) generate the key pair. Which of these options is more appropriate is a matter of debate. Each approach has advantages and disadvantages. End-user generation of keys can be effective, especially for generating keys for the purpose of nonrepudiation. This option enables the user to build greater confidence in the trust shared with relying parties because the key value is never exposed to another entity. One problem is that the end user must provide software or hardware to generate strong keys. Even though most browsers incorporate this functionality, it tends to be CPU-intensive and slow. In addition, end users face the task of securely transporting the public key to the CA (or corresponding RA) for certification. The second method, in which a central system such as the CA or one of its RAs generates key pairs, also has its advantages. A central system commonly has greater resources to provide for faster key generation. Furthermore, an end user may require cryptographically strong keys that have been generated by a trusted and independently evaluated cryptographic module. In other cases, an end user may need private key backup, and this service can be easily accommodated without unnecessary transfer of the private key. Because each approach offers benefits, many CAs support both options. Yet another option is the use of multiple key pairs. Here, end users generate keys used to provide nonrepudiation, and the central system provides the keys for encryption.
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The strength of public-key cryptographic systems and their associated certificates relies greatly on the security of private keys. It is crucial that only the certified owner the person or organization identified in the certificate use the corresponding private key. The following mechanisms are used to safeguard and limit access to private keys:
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Password protection This is the most common form of protection employed by PKIs. A password or personal identification number (PIN) is used to encrypt the private key, which is stored on the local
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hard disk. However, if the key can be obtained from the hard disk, the problem of accessing the key is reduced to simple password guessing. As a result, this is considered the least secure method and is generally not thought to be a long-term solution.
PCMCIA cards (Personal Computer Memory Card International Association) To reduce the risk of a key being stolen from the user s hard disk, many vendors have begun to offer the option of storing keys on chip cards. Because the key must still leave the card and enter the system s memory, however, it remains vulnerable to theft. Chip cards are discussed in 9. Tokens With tokens, the private key is stored in an encrypted format in a hardware device and can be unlocked only through the use of a one-time passcode provided by the token. Although this technique is more secure than those mentioned so far, the token still must be available to the end user whenever the private key is needed, and it can be lost. Biometrics The key is associated with a unique identifying quality of an individual user (for example, a fingerprint, a retinal scan, or a voice match). The idea is that biometrics can provide the same level of security as tokens while alleviating the need for the user to carry a device that can be lost. Smart cards In a true smart card (see 3), the key is stored in a tamperproof card that contains a computer chip, enabling it to perform signature and decryption operations. Thus, the key never leaves the card, and the possibility of compromise is greatly reduced. However, the user must carry a device, and if the card was used for encryption and is lost, the encrypted data may be unrecoverable.
NOTE:
Most users take few or no precautions to protect their private keys from theft. As public-key technology becomes more widely used, organizations will probably devote more time to awareness programs and education.
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