Tracing TLS with Skype for business and SBC's with Ephemeral Diffie-Hellman

Copper Contributor

We are haveing issues with TLS connections between the Mediation Servers and SBC's. I have the Netmon PCAP's and want to open the Files with Wireshark.

The SBC is handling as TLS Server and Skype for Business as TLS Client.

In the TLS Handshake, the SBC's selected the Cipher Suite: TLS_DHE_RSA_WITH_AES_256_GCM_SHA384 (0x009f).

 

To decrypt the communication I need the Pre-Master secret from the Client (Mediation Server).

Is there a way to Export the Pre-Master secret (symmetric session key) in to a file, so that I can Import it into Wireshark?

 

 

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