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Although most of this book focuses on using packet analysis for network troubleshooting, a considerable amount of real-world packet analysis is done for security purposes. This could be the job of an intrusion analyst reviewing network traffic from potential intruders, or of a forensic investigator attempting to ascertain the extent of a malware infection on a compromised host. Packet analysis for security is a big topic, suitable for an entire book. This chapter provides a taste of analyzing packets with a security focus.