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Chapter 16: Advanced Security 9intercept and change messages. Figure 16-4 illustrates the hash-encoding process. Thenames of the most popular hashing algorithms are SHA and MD5.Figure 16-4Hash EncodingSymmetric EncryptionSymmetric encryption requires both sides of an encrypted conversation to use an encryptionkey to be able to encode and decode the data. The sender and receiver must use identicalkeys. Figure 16-5 illustrates the symmetric encryption process.Figure 16-5Symmetric Encryption
10 IT Essentials: PC Harware and Software Companion GuideAsymmetric EncryptionAsymmetric encryption requires two keys, a private key and a public key. A private key isrequired for writing a message, and a public key is needed to decode the message. Theadvantage of asymmetric encryption is that only the private key needs to be kept secret.Public keys can be distributed openly by e-mail or by posting them on the web. Figure 16-6illustrates the asymmetric encryption process.Figure 16-6Asymmetric EncryptionVirtual Private NetworkA Virtual Private Network (VPN) uses encryption to secure data as if it were traveling in aprivate, corporate LAN, even though the data actually travels over any network, for example,the Internet. The secured data pipelines between points in the VPN are called “securetunnels.” Figure 16-7 illustrates how a VPN is used to provide security.Figure 16-7Virtual Private Network
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iiiTrademark AcknowledgmentsAll ter
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vAbout the Technical ReviewersDavid
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ixIdentify the Names, Purposes, and
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CHAPTER 1Introduction to the Person
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CHAPTER 7Fundamental Printers and S
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CHAPTER 13Advanced Laptops and Port
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