Erethon’s corner

Random thoughts of mine

Making a RS-232/UART adaptor

May 28, 2014

A couple of months ago I wanted to experiment with the serial console of an old router I had laying around. Not wanting to buy a UART to RS-232 adaptor, I decided to make one myself. After all, I had some spare MAX3232 left over from a previous project (for which I still haven’t blogged). I just followed the schematic provided by the datasheet and 15 minutes of soldering later, this was the end result.

Octopress here I come!

May 28, 2014

I decided to port my blog to Octopress and move away from Wordpress after all these years. The reason for this is twofold: I’ve really gotten used to working with vim, git, github and the surrounding workflow. Static site generators are all the rage currently, so who am I to miss out? Why Octopress and not something based on Python like Pelican or Nikola? I simply decided to do something that will get me out of my comfort zone and also teach me something new.

Raspi + SDR + ADS-B = awesome

Dec 15, 2013

A lot of people have combined a RasPi and a SDR dongle to get a low power consumption ADS-B tracker. Tomasz Miklas has created an image for the Raspberry Pi, that has everything that is needed to run your own aircraft tracking “service” already set up. I’ve finally had a chance to experiment with it and this will be my short review. First of all, I have to say I’m really sorry to Tomasz, because he send me the image at the 10th of October to test it out before releasing it publicly and I’m posting this two months later.

An intro to SDR

Feb 25, 2013

For the past two months I’ve been reading about SDR and everything related to radio telecommunications. For those that don’t know what SDR is (and are too bored to click the previous link), Software Defined Radio is a system that implements hardware subsystems of a typical radio in software. People have been designing their own SDRs with FPGAs for quite some time now, but in the last year there has been a huge “revolution”.

My Kippo findings after three months

Jan 13, 2013

Three months ago I installed Kippo in a low end VPS of mine. About a month after that, I got bored of manually checking kippo everyday so I made a small script to automate the process. Fast forward another two months and here we’re. In three months time, I had 122.487 bruteforce attempts from 339 different IPs. Of said attempts, 130 were successful on finding the correct password(s). I set up Kippo to accept two different easy-to-guess passwords for the root account.

Making an ugly Ethernet tap

Jan 7, 2013

A long time ago, I saw this in the Hak5 store. After reading about it in mossmann’s blog, I found somewhat interesting that using this easily built device you can HACK THE PLANET. An ethernet tap is a passive device used to monitor traffic between two hosts using a third one. For more info on network taps read here. The idea behind it is very simple, but in order to understand it we must first understand how data is transmitted through the ethernet cable.

Arp spoofing with Python

Sep 23, 2012

I decided to reinvent the wheel by making an ARP spoofer in python using raw packets, thinking it would be a nice practice. What is ARP, ARP spoofing/poisoning, ARP cache?? How do they work and why should we care? Since all of these things have been written and explained before, in a better way than I could explain them, here you go. You can find the script here. It’s more like a proof of concept than a fully working program, since I haven’t really tested it in more than two computers, so I don’t know if it’ll work for sure.