0xh3xa

System engineer relentlessly innovating at the intersection of cybersecurity, low-level programming, and OS kernel design.

The Journey Continues: New Posts

CTF

PicoCTF: Tap into Hash - Walkthrough

Solution for picoCTF: Tap into Hash

21 Mar 2025

1 minute read

CTF

PicoCTF: Quantum Scrambler - Walkthrough

Solution for PicoCTF: Quantum Scrambler

21 Mar 2025

less than 1 minute read

DevOps

How to Log In to Compute Engine in GCP After MFA Lockout

Startup GCP Compute Engine

19 Mar 2025

1 minute read

Defensive

How to start learning x86 Assembly Language

Learning Assembly language for beginners

18 Feb 2025

1 minute read

Defensive

Introduction to Assembly Language

Learning Assembly language for beginners

18 Feb 2025

4 minute read

DevOps

How do I schedule a GitHub Action to run at midnight on branch changes?

GitHub Action Scheduler

14 Feb 2025

2 minute read

Defensive

Unpacking UPX packer

Quick review of unpacking the UPX packer

26 Aug 2023

3 minute read

Linux

Grant Tomcat 9 Access to Other Files

Learn how to grant Tomcat 9 access to files outside its default directory.

08 Aug 2020

less than 1 minute read

Linux

Configure Apache httpd as reverse proxy

How to configure Apache httpd as Reverse proxy in front of the tomcat java web application with SSL by Let's Encrypt?

27 Jul 2020

1 minute read

DevOps

What Is a Java Record?

Introduction to Java Record JDK-14

27 Jul 2020

2 minute read