Two different methods can be implemented to secure e-mail:
■ Securing the content of e-mail messages. The content of e-mail mes sages is secured by implementing Secure/Multipurpose Internet Mail Exten sions (S/MIME).
■ Securing data as it is transmitted between the mail client and the mail server. The data stream is protected by implementing Secure Sockets Layer (SSL) or Transport Layer Security (TLS) to provide validation of the mail server's identity and encryption of the data transmitted between the mail server and the mail client.
The sections that follow provide more specific information on how the two methods work to protect e-mail messaging.
Note The design details of S/MIME version 3 are defined in RFC 2633, "S/MIME Version 3 Message Specification," referenced in the "Additional Information" section of this chapter.
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