Defender in Progress

Abdur Rahim

Cyber Security.

currently learning.

Read my writeupsSee my lab
defender@lab: ~
$ whoami
Abdur Rahim
$ cat mission.txt
IT support by day, defender in training.
Learn in public. Build a home lab.
Document every step.
LinuxKaliTryHackMeufwOPNsenseVLANIDS/IPSWiresharkBashNetworkingAstro
now

What I am working on right now

Learning

TryHackMe Cyber Security 101 (Linux Fundamentals, Cryptography Basics)

Building

A home lab for firewall, segmentation, and Linux hardening practice.

Writing

Study notes and writeups from every room and lab I finish.

Journey

From IT support to cyber security

  1. 2021

    Started B.Sc. Computer Systems

    Universitas Putra Indonesia "YPTK" Padang.

  2. 2025

    Graduated B.Sc. Computer Systems

    Certificate of Appreciation from YPTK Padang Foundation.

  3. [TAHUN]

    IT Support at a multi-branch company in Jakarta

    Networks, IP CCTV, PABX.

  4. Oct 2026

    Started the cyber security path

    Kali Linux, TryHackMe.

  5. Nov 2026

    Built this website on Kali Linux

    Static site with a strict CSP.

See the full journey →
Lab

What I am building and breaking at home

Kali Linux dual boot

Setting up Kali Linux as a dual boot system and troubleshooting it along the way.

Kali LinuxLinux

Workstation hardening with ufw

An egress firewall with ufw, so outgoing traffic is controlled too, not just incoming.

ufwLinuxHardening

Secure AI coding setup

AI coding tools locked down with deny rules and an immutable config.

HardeningAI tooling
See all lab projects →
blog

Notes from the road

The first writeups are on the way. Check back soon.

Read all writeups →

Say hello

Learning cyber security too, have feedback on a writeup, or want to talk about an opportunity? I would love to hear from you.

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