![]() The value you give this variable should be the location of a text file that the browser will create and write to then wireshark will read (lots of secrets will be written!) In this example I used C:\master.txt. Under system variables click create a new variable and call it SSLKEYLOGFILE. Right click on ‘My Computer’ and then properties > Advanced System Settings > Environment Variables. This is quite easy to set for both windows or Linux as you can see below Windows They variable the browsers look for is “SSLKEYLOGFILE” and the location this is set to. Client Access (pre)Master Secretīenefit of this option is you don’t need the private key or access to the server ) Little more info from Mozilla about this file/formatīoth Firefox and Chrome support writing the (Pre)Master Secrets used to encrypt SSL/TLS to a file if a certain environmental variable exists for the operating system. Then just either generate some traffic or if this is a historical pcap all encrypted packets should now show their payload :) "Follow SSL" will display the full decrypted contents but "Follow TCP" will still display the encrypted payload. ![]() The protocol can be various things like smtp or http but use http even for https traffic (capitalisation matters!). Its worth noting that the IP address can be defined as 0.0.0.0 to ask Wireshark to try this key against all IPs, the port can also be 0 to attempt decryption against traffic on all ports. Then just complete the details similar to this. ![]() Open Wireshark, go to Edit > Preferences > Protocols > SSL > RSA Keys list > Edit > New. Location will vary depending on your OS or set-up Using it Quite simple here in that you just copy the private key (being aware you are copying a private key?! :) you can export it with a pass phrase) to a file on your Wireshark machine then tell Wireshark where it is. The biggest benefit here is that its easier to decrypt old captures you may not have necessarily prepared for and its easy to decrypt lots of traffic sourced from multiple clients. So let’s see how to use each option Private Key Access Its worth noting some SSL chipers/key exchanges are do not work with all these options e.g when using ECDH key exchanges, but apart from that they work very nicely. Thanks to chisight in the comments for noting this Unfortunately, dumping the premaster secret was removed in FireFox 48 and later, it is now only available if you compile with a non-default build option. Access to the client machines and its (pre)master secrets (also need Firefox or Chrome).Wireshark has some very nice SSL/TLS decryption features tucked away although you need either of the following two:
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