Not everyone works for you
In the past few days, a lot of people started complaining about Let's Encrypt and how it has issued TLS Certificates for PayPal. Various posts like this were written to complain about that, and some…
"Security" companies and abuse e-mails
The Internet, like almost anything invented by humans, has been used to conduct malicious acts. This can be something not really important like comment spam, all the way to very important cases that are usually…
Debian Firewall when using Docker
Having a firewall is something that's necessary, in my opinion, for every server. Not only for those with a Public IP Address, for any server. Not only for IPv4, for any IP version. Running a…
Guarding your Tor Exit's DNS
In the past few days, a study was released detailing some attacks against the Tor Network. These attacks made it into the news because one could compromise Tor Users' anonymity by examining the DNS queries…
Running a Tor Exit Node for fun and e-mails
The Tor Project is a non-profit organization in the United States that created Tor, The Onion Router, a free software that creates an open network of volunteers which helps people anonymize their traffic by routing…
Capturing flags in Thessaloniki
Earlier this summer, I have participated in the organization of a Capture the Flag competition in Aristotle University of Thessaloniki for students of the Computer Science / Informatics Department. It was co-organized by me, Spyridon Rafail…
Setting up EdgeMAX Devices for OTE IPv6
I spent some time yesterday trying to make an EdgeMAX device, namely the EdgeRouter X SFP work in an OTE ADSL connection. Setting it up is very easy, however I found IPv6 a little bit…
Get eBay Users' Personal Info for free!
eBay is one of the largest e-commerce websites available, especially to people in countries without Amazon. It does not sell its products directly, but instead relies on its users, therefore making an important distinction between…
In Transparency, Size Matters
In my previous post I spent one week without access to non-HTTPS websites. It was difficult, but I managed it. It was a challenge to determine how much of the web is HTTPS yet. It…
A Secure Week
As an engineer, I am genuinely interested in challenges. Not necessarily the problem-solving challenges that we can face daily as a profession, but others forms as well. This is why I decided to challenge myself…