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other is better. Each algorithm may be better suited for different applications. For performance reasons, you don t sign the data but rather sign a representative of the data called a message digest. Also known as a hash, a message digest is the foundation of most PRNGs and PBE implementations. A keyed digest, such as HMAC, is also used to check data integrity.
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As discussed in 4, S/MIME uses public-key cryptography to solve the key distribution problem. As you ve probably already surmised, S/MIME uses digital signatures as well. To implement a digital signature, follow these steps. First, launch Netscape Navigator, click the Security button, and then click Messenger (along the left-hand side of the security window). In 4, you saw the Encrypt choice checked. Notice the two Sign choices as well. If you select these menu items, when you send email or post to newsgroups your message will be signed using your private key. Before you can sign, you need a key pair. The browser has a module that generates a key pair for you, or, if you have a token (such as a smart card), you can specify that it be used to generate the key pair and store the private key. In the security window, click Yours under Certificates. The resulting window displays a button labeled Get A Certificate. This is the starting point for generating a key pair and getting a certificate. ( 6 discusses certificates.) With Microsoft Outlook, click Tools and then Options. In the resulting window, click the Security tab. You saw the Encrypt choice in 4. Here, notice the Sign option. Again, you need a key pair and a certificate. Start the process by clicking the Get A Digital ID button at the bottom of the window.
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Public-Key Infrastructures and the X.509 Standard
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As you learned in 4, public-key cryptography gives you not only a powerful mechanism for encryption but also a way to identify and authenticate other individuals and devices. Before you can use this technology effectively, however, you must deal with one drawback. Just as with symmetric-key cryptography, key management and distribution are an issue with public-key crypto. Instead of confidentiality, the paramount issue for public-key crypto is the integrity and ownership of a public key. For end users and relying parties (relying parties are those who verify the authenticity of an end user s certificate) to use this technology, they must provide their public keys to one another. The problem is that, like any other data, a public key is susceptible to manipulation while it is in transit. If an unknown third party can substitute a different public key for the valid one, the attacker could forge digital signatures and allow encrypted messages to be disclosed to unintended parties. That s why it s crucial to assure users that the key is authentic and that it came from (or was received by) the intended party. Within a small population of trusted users, this task is not very difficult. An end user could distribute the public key by simply hand-delivering it on disk to a recipient, an approach known as manual public-key
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distribution. For larger groups of individuals, however, this task is much more difficult, especially when the people are geographically dispersed. Manual distribution becomes impractical and leaves room for security holes. For that reason, a better solution has been developed: public-key certificates. Public-key certificates provide a systematic, scalable, uniform, and easily controllable approach to public-key distribution. A public-key certificate (PKC) is a tamperproof set of data that attests to the binding of a public key to an end user. To provide this binding, a set of trusted third parties vouches for the user s identity. The third parties, called certification authorities (CAs), issue certificates to the user that contain the user s name, public key, and other identifying information. Digitally signed by the CA, these certificates can now be transferred and stored. This chapter covers the necessary technology needed to understand and use a public-key infrastructure (PKI). First, we describe the X.509 standard and the structure of an X.509 public-key certificate. Then we explain how the PKI components work as a collaborative process to let you create, distribute, manage, and revoke certificates.
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