Changes, changes and more changes!

Hey you, hey you,

I am still here, yes. I am still strong and continue to “hack” around. I do not want to apologize for leaving you alone for so long. I try to do my best for the community and for self-improvement, and today seems like a great day to give you an update. {sunny day in Berlin}

So, lets start from the end. I am currently in Berlin. I left my job as a Blockchain engineer and some really good proposals back in my home country, in order to get to know the “world” better and learn from the best. I am writing this post from a nice and huge wooden library, in the center of Berlin and it is a really good start. I am actively searching for a job, both in decentralization/blockchain/privacy and security sectors, so feel free to give some tips if you are from around, or contact me to grab a beer.

In other news, this was a hell of a year. I completed my academic life (yes I am leaning towards not starting a PhD), I got more into development because of my job and really liked it (Go, Solidity and other languages related to blockchain development), I developed some courses for Hakin9 including Attack and Defense in Blockchain technologies and Penetration testing with Raspberry Pi, I did some great talks in meetups and conferences regarding blockchain and decentralization (you can find my talks in my youtube channel) and released some articles in the BAD-ASS 2600 magazine.

OK, this not at all my whole year, but this is the stuff that stood out and that I want to share with you. As I said, I am now in Berlin, zeroing down the counter, and searching for the next big thing. I don’t know if I will work, if I will create a team, or start a PhD. I just know that I want to create things, share with others and get to know the world. And I don’t mind if one does not know me in the end. Because you will know me.

 

All great changes are preceded by chaos.
Deepak Chopra

 

Cr0wTom

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Introduction to Bitcoin and Blockchain Technologies (Greek)

Are you still here,

As I told you in an earlier post, I have many things that I currently work in! One of them is my recent engagement with Blockchain and Decentralized Ledger Technologies. I started around a year ago with my master degree thesis, with title “PKI Decentralization with Blockchain Technologies” and after that I started working as a Blockchain Engineer in the Aristotle University of Thessaloniki.

This sector is really interesting, with many challenges at its current state, and that’s what I like about it. I also work with a great team of people, and this week I was lucky enough to talk in the Machine Learning and Blockchain join meetup in Thessaloniki about Bitcoin and Blockchain topics. Suddenly, the talk was in Greek and I upload a video capture of it on YouTube. In case I see interest in the video, I will try to add subtitles to it, but it needs some work, so we will see.

I want to thank the people that helped me reach this stage and make this talk, especially Dr. Karasavvas, and I will keep you updated for future talks and events. Also, thanks to everyone that joined me in this meetup, and if you have any questions please add it to the comments bellow or in the YouTube video.

Cr0wTom

TROOPERS18 and a crazy journey!

Hello friend,

Thinks are happening to my territory, and no time slots for this lonely blog. I see that many of you keep visiting though and I am really happy about it. I have many things to tell you. Many things happen in my life, and I want to continue to share with you my experiences in the security and privacy sector.

The last big think that happened, was TROOPERS18. My second time in this conference was outstanding, and even better than the first one. I don’t want to talk about the technicals of this conf. The main conference had some great talks, the PacketWars was really fun, and the interactions I had with the community made this experience awesome. But digging into them is a waste of time. I strongly suggest you to go and live it. Meet people, join talks and overall enjoy your time there. That’s what I did this year and marked it as one of the great experiences of my security life.

And as you know, I like to express myself through my videos and photographs, that’s why I prepared a video for you. Enjoy it, and give me your honest feedback 😀

See you at TROOPERS19 😉

Cr0wTom

BlackHat Europe 2017 – The Wrap Up

“Hello, friend. Hello, friend? That’s lame. Maybe I should give you a name, but that’s a slippery slope. You’re only in my head. We have to remember that. Shit.”

Hope you are all well.

After a nice trip to London, and a great time at Blackhat Europe 2017, I feel the need to share my experience with you. Everything started with the place hosting the event. Last year’s BlackHat was hosted in the Business Design Center, which was a really big and open place, perfect for the business hall and the briefings. And I was sceptical about the change of the place to Excel, but when I arrived I understood the need for a change.

The conference was twice as big, with twice the attendees. The briefing rooms were bigger and ready to welcome more people. Room B, where the keynotes and locknote took place, was outstanding, with an aura from BlackHat USA. Green lights everywhere and loud music. People from the industry talking in every corner, and great briefings taking place one after the other.

Last year I was a bit dissapointed from the event. Everything was so quiet, so soft. But this year everything got fixed. I met some great people, both from companies and individuals. Business hall was huge with great companies, prizes everywhere, and some challenges which was really missing from last years event. But the best part was the quality of the briefings, which was something that everyone talked about in the event. All these years Blackhat europe seemed a bit left off, in comparison with its USA sibling, in the aspect of briefings quality. But this year many talks were really great, presented from some really great researchers, so I encourage you to go and watch them as soon as they will be published in the YouTube channel of the event.

Finally, I have to thank illumio for the great prize at the Passport to prizes lucky draw, Jeff Moss and UBM for the Student Scholarship and the opportunity for attending this event for one more year, and everyone that made this event special. See you in the next one, and keep up the good work.

Cr0wTom

p.s. As always I produced a video from the event to bring you my experience. Feel free to Like, Comment, Subscribe or even Dislike my video, and support me. 😀

BlackHat, TROOPERS and more!

Hello guys,

I know you hoped that Cr0w’s Place is dead but I came to deny you. The main reason of my absence is my masters thesis, for which I want to talk you about.

So, basically my thesis is based on blockchain technologies and I am trying to develop an application (and find a way, generally) with which I will be able to bypass the Certificate Authorities of the SSL/TLS protocol. You will be able to read more details about it in my final paper, which will be published around March, but for the time being, you can head to my GitHub profile and give me some love.

In other news, I want to let you know that for one more year I will attend BlackHat Europe and TROOPERS. Just today I got informed from Niki (the nice lady that is responsible for TROOPERS) that I will attend the event with a scholarship for one more year. I am really happy about it and of course you will have coverage of the event from my YouTube channel and my short movies.

TROOPERS 18 takes place in Heidelberd, Germany in the 12th – 16th of March 2018, and BlackHat Europe in the 4,5 December 2017 which I will attend too. I will be happy to meet every one of you there. Until then, stay strong.

Cr0wTom

Hacking WiFi with a 3$ Jammer

In this video for Cr0w’s Place we examine how we can modify a WiFi IoT device, into a powerful WiFi Jammer. A WiFi Jammer is a portable WIFI signal blocker that can disable the WIFI signal effectively. The module that we can use is the ESP8266, and I choose the NodeMCU v1.0 that you can easily find in ebay, for 3$ or so.

Keep in mind that this is NOT a frequency jammer. It is just a deauthing device.

The process of flashing the device is pretty simple. First of all, you download the current release of the firmware from here and upload using the ESP8266 flash tool of your choice. I recommend using the nodemcu-flasher. If this doesn’t work you can also use the official esptool from espressif. But for more information and problem solving just go to the creators github here, so a big shout out goes to spacehuhn. 🙂

Links to buy NodeMCU:

 

 

This project is a proof of concept for testing and education. Please act responsibly.

If you like my videos please Subscribe to my channel.

Thank You For Watching.:)

Cr0wTom

TROOPERS 17 – The Wrap Up

Greeting everyone,

A great week passed in TROOPERS and it is time for my review. As you may already know, TROOPERS is an hacking and infosec conference, taking place in Heidelberg Germany, and this year was the 10th anniversary of the event, with many surprises. So, let’s begin.

 

The NGI Event

The “Next Generation Internet” event aims to provide discussion on how to secure these core technologies by bringing together practitioners from this space and some of the smartest researchers of the respective fields. Taking place on March 20-21, 2017, NGI will blend of breaking, building, hands-on IoT.

These was my first two days in the whole TROOPERS event, and i really enjoyed the talks and the feel of the event. The first day there where a shared dinner, in a medieval restaurant, where I managed to meet and talk with some great people. Generally, it was a small event, because of the trainings that was taking place at the same time, that helped us talk more with the speakers, and make some great discussions.

 

The Main Conference

The main event was HUGE. A big variety of talks, with many great speakers, many great people, and some great stuff that we will see later. What took our attention in the first couple of minutes, was the conference badge (alongside some cool presents 😉 ) that was an arduino based board, custom made in the shape of the TROOPERS logo, with a Nokia 3310 powering and connected to the whole thing. But more about it in the GSM challenges section. 😀

Generally, it was an outstanding event, that I cannot describe to you, because you really have to live it. Really crowded (400 people), in one of the most beautiful places that a conference can take place (Print Media Academy Heidelberg), with many side events, and hacking all over the place. The only thing that  I can do is supply you with my TROOPERS movie, where I tried to capture the best aspects of the events, and you can find here:

 

 

PacketWars

So, the first day of the main conference we had the main shared dinner, where everyone from the conference gathered in a big brewery, where we ate and drank a LOT of beer. But after the food, 6 teams got their laptops in the table and started the PacketWars challenges. PacketWars is a kind of CTF, where every time a different set of challenges take place, and the teams try to hit the best score. I was in a great newbie team, we had a great time and we finished 4th. It was a great time, we had some great ideas but time got in our way, so I don’t really mind about the 4th place.

You can see more about PacketWars here!

 

GSM Challenges

As I told you earlier, the badge had a Nokia 3310 on it, which had a TROOPERS SIM card. Yes, troopers had its own GSM network, and we have to solve some pretty fun challenges with our badge. You can find more about the challenges on the TROOPERS website, but I have to tell you that there was a reason for these challenges.

With a number of successful solves, we acquired a ticket that was automatically printed and put into a box. In the closing keynote, there was a random choice of the tickets that won some presents, including an iPad Pro 😉

Really fun stuff, suddenly I didn’t managed to win a present but I managed to get in the 13th place.

 

Charity Run

What the TROOPERS is really into, is charity. Every year they have many events that they manage to gather money for charities, like an auction with things that the speakers generously donated.

I was proudly a part of the charity run, that we run 10 km in the city of Heidelberg and each of us donated 5 euros for each kilometer that he/she run. It was a great experience, with a marvelous landscape, and some great people! :D.

 

Wrap-Up

I don’t think that I have many things to add. I am clearly amazed and excited about it, and most of it comes from the comparison that I do with other conferences I attended, and the fact that many people, with more experience than me, told me it was the greatest event ever.

I wish to all of you that you will manage to attend the next TROOPERS, and I will see you there 😉

Cr0wTom