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Congratulations to all the teams that participated in the Network Forensics Puzzle Contest at DEF CON 23! View contest results, hints, and passwords here.

We're pleased to announced that Network Forensics Puzzle DVDs from 2011, 2012, and 2014 are all available on BytePuzzles!

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Network Forensics: Tracking Hackers Through Cyberspace

Cover illustration by Jonah Elgart

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On the Internet, every action leaves a mark--in routers, firewalls, web proxies, and within network traffic itself. When a hacker breaks into a bank, or an insider smuggles secrets to a competitor, evidence of the crime is always left behind.

Learn to recognize hackers' tracks and uncover network-based evidence in Network Forensics: Tracking Hackers through Cyberspace. Carve suspicious email attachments from packet captures. Use flow records to track an intruder as he pivots through the network. Analyze a real-world wireless encryption-cracking attack (and then crack the key yourself). Reconstruct a suspect's web surfing history–-and cached web pages, too–-from a web proxy. Uncover DNS-tunneled traffic. Dissect the Operation Aurora exploit, caught on the wire.

Throughout the text, step-by-step case studies guide you through the analysis of network-based evidence. You can download the evidence files from the authors' web site (, and follow along to gain hands-on experience.

Hackers leave footprints all across the Internet. Can you find their tracks and solve the case? Pick up Network Forensics and find out!