León Castillejos’ blog

“Never memorize something that you can look up.” - Albert Einstein

Posts - Page 3 of 4

The DEFINITIVE guide to defeating spammers

  • 6 min read

Nowadays, spamming is a very common technique, and nobody can deny that. Spamming is so cheap that even a 10% opening rate is a tremendous success, because sending e-mails doesn’t require paying fees to ISPs (like you would with mass SMSs and robocalls), and it also doesn’t require hiring anyone to take the time to manually write and send e-mails (as opposed to postal spam, which have to be physically delivered into mailboxes by people), when you can just buy e-mail addresses in bulks by thousands of providers that sell active e-mail addresses by prices so ridiculously affordable, it lowers the barrier to entry dramatically.

Read More

The fun begins: HackTheBox.eu

  • 1 min read

It’s been a while since I joined https://www.hackthebox.eu/. Probably more than a year. And I haven’t really had the time to spend trying to break into the machines, because of my university studies, but now summer is coming, so I will be able to dedicate more resources to it.

Read More

Static analysis tools for Windows

  • 2 min read

I’m currently studying malware analysis, so I wanted to write a post on the tools I’ve been using recently, to serve as a reference for me and hopefully for anyone interested in binary reversing.

Read More

The power of silence

  • 1 min read

I find silence to be grossly underestimated. We live in an era of permanent distraction. Companies use loud, aggressive marketing in the form of advertisements to grab your attention and get you to buy whatever it is they’re selling. Our smartphones have become distraction devices that instead of boosting our productivity, and increase our focus, are loaded of applications that send notifications indiscriminately, connecting us to real-time events instantly.

Read More

Productivity

  • 17 min read

In the past, I used to struggle with my productivity, no matter how hard I seemed to study, my grades didn’t reflect it. I was quite stubborn in believing I wasn’t at fault, like some kind of genius who nobody understood, and reading quotes like this one certainly didn’t help me understand it was actually my problem. I was in denial.

Read More

My favourite Visual Studio Code extensions

  • 2 min read

At first, I really disliked Electron and JS-based text editors, like Atom and VSCode, but after learning Vim, and finding many problems with my plug-ins, on different languages (such as MIPS assembly, Java and VHDL), I decided to give VSCode a try, and I have been very impressed by how well Visual Studio Code works. It’s much faster than JS-based editors used to be, it has amazing community support, and I’m generally faster, and more productive using it. It has fixed a lot of its shortcomings, like its speed.

Read More

Why I use a MacBook

  • 7 min read

In this article, I want to explain why I use a MacBook. I am convinced it is the superior desktop OS, but I also think everyone should use what suits them. In my case, that would be macOS.

Read More

Password managers

  • 4 min read

The Internet nowadays is a very messy place. Identity theft, e-mail confirmations, instant notifications, mobile devices, multiple accounts, data leaks, account dumps, service breaches, malware that steals your bank’s information, scammers, identity theft…

Read More