The value 22 (0x16 in hexadecimal) has been defined as being “Handshake” content.Īs a consequence, tcp & 0xf0) > 2)] = 0x16 captures every packet having the first byte after the TCP header set to 0x16. Wireshark cannot sniff SSL-protected (HTTPS) passwords unless an encryption key is provided: There is a different way to sniff HTTPS data (without providing a key), see here (run Wine for windows apps): Just a friendly reminder, like any other prank war, think twice before you get in trouble with the law. The first byte of a TLS packet define the content type. The offset, once multiplied by 4 gives the byte count of the TCP header, meaning ((tcp & 0xf0) > 2) provides the size of the TCP header. Activity 1 - Capture HTTPS Traffic To capture HTTPS traffic: Open a new web browser window or tab. Log in to this service using your login credentials. This should not be too hard (unfortunately). Find a website that requires login credentials, but that uses HTTP and not HTTPS. Tcp means capturing the 13th byte of the tcp packet, corresponding to first half being the offset, second half being reserved. Sniffing login credentials and other interesting information that passes through unencrypted is also possible with Wireshark. Tcp & 0xf0) > 2)] = 0x16: a bit more tricky, let’s detail this below Tcp port 443: I suppose this is the port your server is listening on, change it if you need Tcpdump -ni eth0 “tcp port 443 and (tcp & 0xf0) > 2)] = 0x16)”Įth0: is my network interface, change it if you need
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