IoT 7 - Monitoring Sensor Using ESP32 and NodeRed
We actually have to send real sensor data over the internet and display it on a dashboard. Like, a REAL dashboard
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24 notes & write-ups
Notes from Underground
24 articles
Moody - Development of a Role-Based Mental Health Platform Using Dockerized VPS Infrastructure
This document describes the development of Moody’s second milestone, expanding the platform from a publicly accessible frontend into a fully interactive system equipped with authentication, role-based access control, a self-managed database, and a functional backend.
Did You Find IT? | CTF Miscellaneous Write Up (FindIT UGM 2026)
This is the first challenge that I solved in FindIT. That’s because the description of it was very straightforward. They both mentioned "Instagram Feed" and…
The Phantom - Diamond | CTF Miscellaneous Write Up (FindIT UGM 2026)
We are given a customized Gemini AI as the attachment. I think it has something to do with prompt injection. I started the chat, and then looked in the way it…
The Eepy Koala | CTF Cryptography Write Up (FindIT UGM 2026)
Given python and ppm files. Here is the solver. This solver starts by reading the encrypted PPM file and splitting the pixel data into 16 byte blocks. That part is…
I Forgor | CTF Cryptography Write Up (FindIT UGM 2026)
Given a .txt based file attachment. It consists of some values of each variable. Here is the solver that I used. This one is a classic RSA common modulus attack.…
IoT 6 - MQTT
MQTT is a lightweight, publish–subscribe, machine-to-machine network protocol for message queuing
IoT 5 - Serial Communication
This time we’re stepping into the world of protocols, specifically I2C.
IoT 4 - Display & PWM
I’m continuing my project, and this week we’re focusing on displays and actuators.
IoT 3 - Sensors
A sensor is a device that reads environmental information.
IoT 2 - Import & Output
Input and output are essential elements in the IoT world.
IoT 1 - Starting My Journey
I will tell you the starting point of my IoT journey
フェイクフェイス・フェイルセイフ | CTF Miscellaneous Write Up (ARA 7.0 ITS)
At first, I was quite confused by this challenge. The title was Japanese, and there was a YouTube link (but it didn’t seem to connect to the challenge). Once I…
Wrapped | CTF Reverse Engineering Write Up (ARA 7.0 ITS)
The title of this challenge is wrapped , and from the start I suspected this wasn’t a straightforward binary. When I first got the file, I noticed there were no…
Deadsick | CTF Reverse Engineering Write Up (ARA 7.0 ITS)
At first, I was quite misled by the description of this challenge. From the title and description of the secure vault, plus the hint about hardware timing, I…
know the trick | CTF Cryptography Write Up (ARA 7.0 ITS)
Just given an nc hostname & port, let’s just open it. Yayaya pipeline directly send LLM, To find X3 , we can use the LLL (Lenstra–Lenstra–Lovász) algorithm, which…
SoMeSINT (CTF OSINT Write-Up)
We’re pretending to be Alex Juulut — who was told to investigating Thomas Straussman — a man whose being accused of cheating on his wife.
WebIntro | CTF Web Exploitation Write Up (SPARTA HMIF ITB 2024)
Fun fact, this is the starting point of my journey in CTF, thanks to SPARTA. Okay, Let’s begin! In this challenge, we are only given the website . After that, I…
CryptoIntro | CTF Cryptography Write Up (SPARTA HMIF ITB 2024)
In this challenge, we were given source code containing: Not only that, we are also given the expected output in the form of .txt , with the following snippet: I…
winrarPRO | CTF Digital Forensics Write Up (SPARTA HMIF ITB 2024)
In this challenge, we were given a .rar file. The first step I took was to extract it using WinRAR so that the folder could be accessed by VS Code. Within the…
I’m Already Tracer | CTF Digital Forensics Write Up (SPARTA HMIF ITB 2024)
In this challenge, we were given the server address ( nc 34.50.98.72 8911 ) and a .pcapng file. To access this file, Wireshark is required. Within the server,…
revintro | CTF Reverse Engineering Write Up (SPARTA HMIF ITB 2024)
In this challenge, we’re given a file named chall . To open it, you’ll need the Ghidra application (or something similar like Binary Ninja). Then, find the Symbol…
pwnintro | CTF PWN Write Up (SPARTA HMIF ITB 2024)
In this challenge, we were given a .zip file and the nc server 34.50.98.72 8111 . To find the required flag, essentially, we sent the payload and ROP using the…
500 DAYS OF SUMMER (Who is Wrong?) : A Movie Review
This is not a love story, this is a story about love