New, TLSv1/SSLv3, Cipher is ECDHE-RSA-RC4-SHA SSL handshake has read 2110 bytes and written 348 bytes Verify error:num=20:unable to get local issuer certificate Use the s_client tool to generate a trace run by connecting and typing “GET openssl s_client -host -port 443ĭepth=1 C = US, O = Google Inc, CN = Google Internet Authority Sample run with ECDHE-RSA-RC4-128-SHA (what gmail prefers) You can arrange to split your PCAPs into flows -> key mapping instead. Unsniff also doesnt care about the session id as a way of mapping flows to keys – the mapping is much weaker. Wireshark allows you to enter something called a ‘unencrypted pre master secret’, we think if you can instrument the client anyway – why not just print out the master secret. Unsniff supports entering a master secret directly. The only question left is : Do you support decryption of the cipher! If you had the master secret, it does not matter what key exchange algorithm you use. With DHE, what’s done is done, baby.Ī post on the Wireshark Q&A site wondered if you controlled the client or the server and could output the so called master secret, can you then decrypt the SSL/TLS traffic? The answer is absolutely!

We’ve written how EDH (Ephemeral Diffie Hellman) offers perfect forward secrecy in the sense that if even if you got your hands on some keying material such as a private key file, you cant decrypt past captured traffic.

Wireshark decrypt ssl data tab