Erethon’s corner

Random thoughts of mine

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.

About me

Jan 1, 1970

Bio My name is Dionysis Grigoropoulos and I’m 27 years old. I currently work at Transifex. In the past, I used to work at Pollfish as a DevOps engineer and before that, I worked as a developer for GRNET’s Synnefo (Synnefo on GitHub) cloud stack platform. I’m really interested in anything related to infosec, from hardware hacks and low level exploitation up to social engineering and web app exploitation. I believe in decentralization and the open web.