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Index Search | Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z Index: Z Zheng, Yliang : 6.5.4.3. HAVAL Zimmermann, Phil : 6.6.3. PGP: Pretty Good Privacy zone transfers 17.3.6. Domain Name System (DNS) (TCP and UDP Port 53) 17.3.6.1. DNS zone transfers Search | Symbols | A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z Copyright © 1999 O'Reilly & Associates, Inc. All Rights Reserved. [ Library Home | DNS & BIND | TCP/IP | sendmail | sendmail Reference | Firewalls | Practical Security ] file:///C|/Oreilly Unix etc/O'Reilly Reference Library/networking/puis/index/idx_z.htm [2002-04-12 10:44:05]
[Chapter 12] 12.3 Protecting Data 12.3 Protecting Data Chapter 12 Physical Security Obviously, as described above, there is a strong overlap between physical security and data privacy and integrity. Indeed, the goal of some attacks is not the physical destruction of your computer system but the penetration and removal (or copying) of the sensitive information it contains. This section explores several different types of attacks on data and discusses approaches for protecting against these attacks. 12.3.1 Eavesdropping Electronic eavesdropping is perhaps the most sinister type of data piracy. Even with modest equipment, an eavesdropper can make a complete transcript of a victim's actions - every keystroke, and every piece of information viewed on a screen or sent to a printer. The victim, meanwhile, usually knows nothing of the attacker's presence, and blithely goes about his or her work, revealing not only sensitive information, but the passwords and procedures necessary for obtaining even more. In many cases, you cannot possibly know if you're being monitored. Sometimes you will learn of an eavesdropper's presence when the attacker attempts to make use of the information obtained: often, by then, you cannot prevent significant damage. With care and vigilance, however, you can significantly decrease the risk of being monitored. 12.3.1.1 Wiretapping By their very nature, electrical wires are prime candidates for eavesdropping (hence the name wiretapping). An attacker can follow an entire conversation over a pair of wires with a simple splice - sometimes he doesn't even have to touch the wires physically: a simple induction loop coiled around a terminal wire is enough to pick up most voice and RS-232 communications. Here are some guidelines for preventing wiretapping: ● ● ● Routinely inspect all wires that carry data (especially terminal wires and telephone lines used for modems) for physical damage. Protect your wires from monitoring by using shielded cable. Armored cable provides additional protection. If you are very security conscious, place your cables in steel conduit. In high-security applications, the conduit can be pressurized with gas; gas pressure monitors can be used to trip an alarm system in the event of tampering. However, these approaches are notoriously expensive to install and file:///C|/Oreilly Unix etc/O'Reilly Reference Library/networking/puis/ch12_03.htm (1 of 9) [2002-04-12 10:44:06]
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Practical UNIX & Internet Security
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Index Search | Symbols | A | B | C
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Index 8.8.3.1. Joetest: a simple pa
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Index American Society for Industri
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Index scripts 18.2. Running a Secur
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Index denial-of-service attacks 1.5
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Index Digital Signature Algorithm :
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Index embedded commands : (see comm
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[Chapter 5] The UNIX Filesystem 5.1
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[Chapter 20] 20.4 Improving NFS Sec
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[Chapter 15] 15.8 UUCP Over Network
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[Chapter 23] 23.6 Tips on Generatin
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[Chapter 5] 5.3 The umask 0666 defa
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[Chapter 23] 23.9 A Good Random See
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[Chapter 23] 23.9 A Good Random See
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[Chapter 12] Physical Security as d
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[Chapter 17] 17.6 Network Scanning
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[Chapter 24] 24.3 The Log Files: Di
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[Chapter 18] 18.5 Risks of Web Brow
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[Chapter 18] 18.5 Risks of Web Brow
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[Chapter 22] 22.4 SOCKS Figure 22.1
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22.4.5 SOCKS Identification Policy
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[Chapter 22] 22.4 SOCKS Obviously,
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[Chapter 22] 22.4 SOCKS [ Library H
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[Chapter 20] 20.3 Client-Side NFS S
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[Appendix F] F.2 U. S. Government O
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[Chapter 17] 17.5 Monitoring Your N
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[Chapter 19] RPC, NIS, NIS+, and Ke
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[Chapter 19] RPC, NIS, NIS+, and Ke
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[Chapter 11] 11.4 Entry environment
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[Chapter 3] 3.5 Verifying Your New
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[Chapter 3] 3.5 Verifying Your New
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[Chapter 21] 21.2 Building Your Own
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[Chapter 21] 21.2 Building Your Own
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[Appendix D] D.2 Security Periodica
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[Appendix D] D.2 Security Periodica
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[Chapter 14] 14.2 Serial Interfaces
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[Appendix C] C.3 Signals C.3 Signal
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[Appendix C] C.3 Signals overflows)
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[Chapter 27] 27.4 What All This Mea
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[Appendix E] E.2 Usenet Groups E.2
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[Chapter 15] 15.9 Summary 15.9 Summ
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[Preface] Scope of This Book into y
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[Preface] Scope of This Book Append
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[Preface] Conventions Used in This
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[Preface] Acknowledgments Acknowled
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[Preface] Acknowledgments [ Library
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[Preface] A Note to Computer Cracke
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[Part II] User Responsibilities Par
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[Part III] System Security Part III
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[Chapter 20] 20.5 Some Last Comment
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[Chapter 20] 20.5 Some Last Comment
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[Chapter 22] Wrappers and Proxies C
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[Chapter 21] 21.3 Example: Cisco Sy
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destination Specifies the address o
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[Chapter 21] 21.3 Example: Cisco Sy
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[Chapter 21] 21.6 Final Comments
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[Chapter 22] 22.2 sendmail (smap/sm
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Page 1009 and 1010:
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[Chapter 22] 22.3 tcpwrapper ● Tr
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[Chapter 22] 22.3 tcpwrapper 6. 7.
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[Chapter 22] 22.3 tcpwrapper # # /e
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} [Chapter 22] 22.3 tcpwrapper sed
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[Chapter 22] 22.6 Writing Your Own
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[Chapter 22] 22.6 Writing Your Own
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[Part VI] Handling Security Inciden
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[Appendix B] Important Files B. Imp
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[Appendix B] Important Files /etc/d
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[Appendix B] Important Files chgrp
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[Appendix B] Important Files rc? Bo
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