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You may also notice that some of the Certificates are bigger than the others. Note that, depending on the particular Server / CA / Protocol you’re dealing with, the packet capture may contain multiple Certificates. You are looking for a section similar to this: In the packet you’ve selected, identify the Transport Layer Security section and expand the contents. In the popup window, go to "Protocols" and then "TCP"ģ. Client Find all Client TLS Hello packetsĢ. Finding the Hello Packetĭepending on what you already know, there are all sorts of ways you could use Wireshark’s Filters to identify the inital packet… You can mix and match conditions as required to help you find what you’re looking for. Once we’ve identified this initial packet, we can then follow the conversation and get the Certificate(s) involved. A hello packet is sent by the Client to the Server to initiate the connection between the two. If you need to see exactly what Certificates are being exchanged between things over the network, Wireshark has the answers.Īssuming you’ve got a PCAP full of stuff, the first thing you need to do is to find the right ‘Hello’ packet.