The user can then use the software to destroy the

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are found. The user can then use the software to destroy the virus and repair any damage if possible. Detection or interception programs monitor the computer's processing and stop viruses from accessing and infecting the computer. Another way to pre- vent damage from viruses is through the use of digital signature encryption. This technology transmits a mathematically encoded signature that can be used to authenticate the identity of the indi- vidual sending a message. Another application of encryption technology is to code data transmissions so that they cannot be easily intercepted by hack- ers or other computer criminals. One way to encrypt data is through the use of a public key infrastructure. This technology uses an algorithm to create a public and a private key. The pri- vate key is given only to the requesting enterprise, whereas the public key is a searchable directory. To transmit a message, the sender searches a digital certificate directory to find the recipi - ent's public key and uses it to encrypt the message. The message is decoded by the recipient using the private key. Security creden- tials and public keys are issued and managed by an independent certificate authority. Messages can also be encrypted through the use of a "pretty good privacy" (PGP) program. This program is available as freeware or shareware and works with most popular email programs. The public key is part of the program and is registered with a pretty good privacy server. A third option for data encryption is through the use of a virtual private network. This technology uses a public telecommunications infrastructure to provide secure communications between individual users or between the enterprise and remote locations. Firewalls are another security measure employed by many enter- prises. A firewall is a special-purpose software program or piece of computer hardware that is designed to prevent authorized access to or from a private network. Firewalls are often used to prevent unauthorized access to a private network from the Internet. The firewall is located at the network gateway server and examines incoming messages to determine their origin, des- tination, purpose, contents, and attachments before making the decision whether to forward the message to the intended recipi- ent. Although firewalls are useful for protecting against intruders,
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Page 4 EBSCO Research Starters ® • Copyright © EBSCO Information Services, Inc. • All Rights Reserved Communications, Networking & Security they often filter out executable programs or attachments of exces - sive length on the assumption that they may contain harmful contents. Historically, firewalls have been separate application programs that were loaded onto a system. Increasingly, however, they are being built into operative systems and communication devices.
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  • Spring '12
  • Kushal Kanwar
  • Computer Security, Computer network, EBSCO Information Services, EBSCO Research Starters®

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