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file as an e-mail attachment, you are using MIME S/MIME takes this content and specifies a framework for encrypting the message as a MIME attachment S/MIME was developed by RSA Data Security and uses the X509 format for certificates The specification supports both 40-bit RC2 and 3DES for symmetric encryption The protocol can affect the message in one of two ways: the host mail program can encode the message with S/MIME, or the server can act as the processing agent, encrypting all messages between servers The host-based operation starts when the user clicks Send; the mail agent will then encode the message using the generated symmetric key Then the symmetric key is encoded with the remote user s public key for confidentiality or signed with the local user s private key for authentication/nonrepudiation This enables the remote user to decode the symmetric key and then decrypt the actual content of the message Of course, all of this is handled by the user s mail program, requiring the user simply to tell the program to decode the message If the message is signed by the sender, it will be signed with the sender s public key, guaranteeing the source of the message The reason that both symmetric and asymmetric encryption are used in the mail is to increase the speed of encryption and decryption As encryption is based on difficult mathematical problems, it takes time to encrypt and decrypt To speed this up, the more difficult process, asymmetric encryption, is used only to encrypt a relatively small amount of data, the symmetric key The symmetric key is then used to encrypt the rest of the message The S/MIME process of encrypting e-mails provides integrity, privacy, and, if the message is signed, authentication Several popular e-mail programs support S/MIME, including the popular Microsoft products, Outlook and Outlook Express They both manage S/MIME keys and functions through the Security screen, shown in Figure 14-1 This figure shows the different settings that can be used to encrypt messages and use X509 digital certificates This allows interoperability with web certificates, and trusted authorities are available to issue the certificates Trusted authorities are needed to ensure the senders are who they claim to be, an important part of authentication In Outlook Express, the window is more simplistic (see Figure 14-2), but the same functions of key management and secure e-mail operation are available While S/MIME is a good and versatile protocol for securing e-mail, its implementation can be problematic S/MIME allows the user to select low strength (40-bit) encryption, which means a user can send a message that is thought to be secure but that can be more easily decoded than messages sent with 3DES encryption Also, as with any protocol, bugs can exist in the software itself Just because an application is designed for security does not mean that it, itself, is secure (In October 2002, for example, a buffer overrun was found in Outlook Express s S/MIME error handling) Despite its potential flaws, however, S/MIME is a tremendous leap in security over regular e-mail Pretty Good Privacy (PGP) implements e-mail security in a similar fashion to S/MIME, but PGP uses completely different protocols The basic framework is the same: The user sends the e-mail, and the mail agent applies encryption as specified in the mail program s programming The content is encrypted with the generated symmetric key, and that key is encrypted with the public key of the recipient of the e-mail for confidentiality The sender can also choose to sign the mail with a private key, allowing the recipient.

Model refers to the actual device described A later model of the ibm 2314 Similar disks are made by other manufacturers, often with smaller seek times c Year refers to the rst year of use for the general type of

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computers would ever be needed! Not so long ago it was thought that the world of personal computing revolved around one or two popular operating systems The reality is that as innovative new devices are built for everything from automobile navigation to home entertainment, personalized computing devices become more and more diverse Many don't even have operating systems in the traditional sense

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The best laid schemes o mice and men Gang aft a-gley Robert Burns To a Mouse, 1787

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The motivation behind CT is customization and control The real significance of integrating computer technology with telephony is the opportunity to tie any form of intelligent appliance, whether it be a mainframe computer, personal computer, or other personal information appliance, into the telephone system in order to create a customized, and preferably personalized, communications environment

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