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Step by step SSL decrypt with wireshark

asked 2017-12-30 14:05:42 +0000

jdoe gravatar image


I want to decrypt my traffic from my browser (Firefox Quantum). It sends https traffic over my router, where I try to dump it with tcpdump. Then I want to decrypt that file with wireshark and I want to see if I can get the URLs that I visited. I read that I need a ssl key and a tls key in order to do that. However, it seems not to work. But I am sure that I am doing something wrong. Therefore I wanted to ask if my start is correct at all:

tcpdump -i wlan0 -s 0 port 443 -w dump.pcacp

Thanks jdoe

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answered 2017-12-30 15:01:28 +0000

Uli gravatar image

Have a look at Peter's slides of his talk at Sharkfest.


  • Set environment variable SSLKEYLOGFILE before starting Firefox
  • Configure file in Wireshark preferences: Edit → Preferences; Protocols → SSL; (Pre-)Master Secret log filename.
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Asked: 2017-12-30 14:05:42 +0000

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Last updated: Dec 30 '17