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With this key log file, we can decrypt HTTPS activity in a pcap and review its contents.

Decryption is possible with a text-based log containing encryption key data captured when the pcap was originally recorded. This Wireshark tutorial describes how to decrypt HTTPS traffic from a pcap in Wireshark. When reviewing pcaps from malware activity, it’s very helpful to know what’s contained within post-infection traffic. But like most websites, various types of malware also use HTTPS. Why? Because most websites use the Hypertext Transfer Protocol Secure (HTTPS) protocol. When reviewing suspicious network activity, we often run across encrypted traffic. The instructions assume you are familiar with Wireshark, and it focuses on Wireshark version 3.x. This tutorial is designed for security professionals who investigate suspicious network activity and review packet captures (pcaps) of the traffic.