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Here's a preview from my zine, Bite Size Networking!! If you want to see more comics like this, sign up for my saturday comics newsletter or browse more comics!

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panel 1:

phone: ???
server: ???
small sad stick figure, thinking: what is my phone saying about me? looks like it’s encrypted

panel 2:

mitmproxy can proxy connections from your laptop or phone and let you see the contents. It even works with encrypted connections.

An illustration showing a phone, a server (represented by a box with a smiley face), and mitmproxy between them. There are arrows going to and from mitmproxy and the phone and server.

how you use it

  1. install mitmproxy root CA on your laptop/phone
  2. run mitmweb (web UI version) on computer
  3. tell the program/phone to proxy through mitmproxy

how it works

phone: wizardzines.com certificate plz
mitmproxy: yes I am wizardzines.com
phone: sounds legit, this CA I trust [the fake mitmproxy CA you installed] says that certificate is valid

some apps pin a cert

makes mitmproxy not work, look up “trust killer” to get around that

script it in Python

modify requests/responses arbitrarily

other similar tools

(not all are free, though)

  • charles proxy
  • burp suite
  • fiddler

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