Cybersecurity · Python · Linux

I learn by building, testing, and breaking things.

I’m Bobby Liu. This is a collection of security research, software projects, and technical notes from the systems I’m learning.

Security notebook

Concepts, clarified

Working notes on the frameworks and vocabulary used in security.

Selected work

Tools and experiments built to turn technical concepts into working systems.

A Python script that solves web-based Sudoku puzzles and enters the answers automatically.

A Python scraper that gathers security headlines from several sources into one CSV report.

A Bash script for applying a basic security baseline to a fresh Kali Linux virtual machine.

A Bash toolkit for learning, applying, backing up, and restoring Linux firewall rules.