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1/19Figure 3-1 Places Where a Buffer Can Overflow.

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Figure 3-2 Data Structure for File Access.

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Figure 3-3 Modified Data.

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Figure 3-4 Virus Appended to a Program.

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Figure 3-5 Virus Surrounding a Program.

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Figure 3-6 Virus Integrated into a Program.

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Figure 3-7 Virus Completely Replacing a Program.

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Figure 3-8 Boot Sector Virus Relocating Code.

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Figure 3-9 Recognizable Patterns in Viruses.

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Figure 3-10 Stubs and Drivers.

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Figure 3-11 Covert Channel Leaking Information.

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Figure 3-12 Covert Channels.

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Figure 3-13 File Lock Covert Channel.

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Figure 3-14 File Existence Channel Used to Signal 100.

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Figure 3-15 Covert Timing Channel.

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Figure 3-16 Modularity.

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Figure 3-17 Coupling.

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Figure 3-18 Information Hiding.

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Figure 3-19 Fault Discovery RateReported at Hewlett-Packard.