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I am capturing some traffic from a host using wireshark. How do I know if the traffic is encrypted by analyzing the packets?

asked 2019-07-31 09:06:45 +0000

JimmyMcnulty gravatar image

updated 2019-08-01 03:11:09 +0000

I am capturing some traffic from a host using wireshark. How do I know if the traffic is encrypted by analyzing the packets?

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Easiest one, if want to separate your trafic converstations, HTTP will be mainly on tcp port 80 (or 8080 as alternative, http-proxy) , and HTTPS on tcp port 443. Display filters: tcp.port==443 for HTTPS and tcp.port==80 for plain HTTP. For HTTPS traffic (after the handshake) you should see the bytes corresponding for the TLS encryption. Check this site for example for details on TLS, or elsewhere.

xinxolHH gravatar imagexinxolHH ( 2019-07-31 09:59:54 +0000 )edit

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answered 2019-07-31 21:14:21 +0000

mrEEde gravatar image

If it is HTTP then the TCP payload from the server will start with "HTTP"
The data to the server will mostly start with "GET" or "POST"

If it is HTTPS you will see a TLS header
HTTP display filter

tcp.payload[0:4]=="HTTP" or tcp.payload[0:3]=="GET" or tcp.payload[0:4]=="POST"

TLS (HTTPS) display filter

1703:00<tcp.payload[0:3]<1703:05

Hope this answer helps .. .
Regards Matthias

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Asked: 2019-07-31 09:06:45 +0000

Seen: 100 times

Last updated: Aug 01