https://www.ryantzj.com/ Recent content on ryantzj Hugo en-us Mon, 16 Feb 2026 00:00:00 +0000 https://www.ryantzj.com/now/ Mon, 16 Feb 2026 00:00:00 +0000 https://www.ryantzj.com/now/ <h1 id="what-im-doing-now">What I&rsquo;m doing now</h1> <h2 id="current-focus">Current Focus</h2> <ul> <li><strong>Exploring automation</strong> - Setting up home automation and AI-powered workflows</li> <li><strong>Security research</strong> - Continuing work in mobile security and vulnerability research</li> </ul> <h2 id="learning">Learning</h2> <ul> <li>Hugo static site generation</li> <li>Home automation with OpenClaw</li> <li>Tailscale networking</li> </ul> <h2 id="projects">Projects</h2> <p>Check out my <a href="https://www.ryantzj.com/projects">projects page</a> for more details on what I&rsquo;m building.</p> <hr> <p><em>Last updated: 2026-02-16</em></p> https://www.ryantzj.com/about/ Sat, 07 Feb 2026 20:00:00 +0800 https://www.ryantzj.com/about/ <p>Security researcher (<strong>OSCE, OSCP, CRT</strong>) based in Singapore.</p> <p>Previously worked with <strong>Splunk</strong> (Splunk Architect, Enterprise Security).</p> <p>I work on mobile security, reverse engineering, and penetration testing. Occasionally I do data analytics with <strong>Python</strong> and web scraping with <strong>Beautiful Soup</strong>.</p> <p>Off the computer, I travel, cook, and practice aikido.</p> <h2 id="about-this-website">About this website</h2> <p>I blog about information security topics. Thoughts and opinions are my own.</p> <hr> <p><em>Perceive that which cannot be seen with the eye. — Miyamoto Musashi</em></p> https://www.ryantzj.com/projects/ Sat, 07 Feb 2026 20:00:00 +0800 https://www.ryantzj.com/projects/ <p>Some interesting projects I&rsquo;ve worked on.</p> <hr> <h2 id="shellmorepy">Shellmore.py</h2> <p>Shellmore is a script to generate various shell payloads such as exe, msi, pl, elf and veil generated payload.</p> <p><a href="https://github.com/ryantzj/shellmore/blob/master/shellmore.py">GitHub</a></p> <hr> <h2 id="stock-analysis">Stock Analysis</h2> <p>Stock analysis is a Data analytic project that correlates all Bursa Stocks daily moving price and frequency of discussion on forums.</p> <p><a href="https://github.com/ryantzj/Stock-Analysis">GitHub</a></p> <hr> <h2 id="personal-news-aggregator">Personal News aggregator</h2> <p>Personal News Aggregator is a Django Powered news aggregator.</p> <p><a href="https://github.com/ryantzj/News-aggregator">GitHub</a></p> https://www.ryantzj.com/posts/flexense-syncbreeze-exploit/ Wed, 31 Jan 2018 14:26:00 +0800 https://www.ryantzj.com/posts/flexense-syncbreeze-exploit/ A buffer overflow I discovered while practicing for OSCE. https://www.ryantzj.com/posts/dynamic-instrumentation-mobile-security/ Fri, 29 Sep 2017 11:46:00 +0800 https://www.ryantzj.com/posts/dynamic-instrumentation-mobile-security/ This is a follow-up blog post after my Dynamic Instrumentation in Mobile Security presentation in Nanyang Technology University CSEC Offensive Cyber Security Club. https://www.ryantzj.com/posts/owasp-mstg-ios-crackme/ Sun, 23 Apr 2017 13:42:00 +0800 https://www.ryantzj.com/posts/owasp-mstg-ios-crackme/ My Fellow colleague Bernhard developed two iOS Crackme and here is the writeup. https://www.ryantzj.com/posts/android-apk-structure/ Sun, 22 Jan 2017 18:54:00 +0800 https://www.ryantzj.com/posts/android-apk-structure/ What is the structure of APK and what&rsquo;s the fuzz of Meitu xiu xiu abuse of permission? https://www.ryantzj.com/posts/boot-sequence-in-android/ Sat, 14 Jan 2017 16:28:00 +0800 https://www.ryantzj.com/posts/boot-sequence-in-android/ What is the boot sequence of Android and what are the different modes that it supports - download mode, recovery mode, twrp and more. https://www.ryantzj.com/posts/android-sandbox-and-ipc/ Mon, 09 Jan 2017 14:40:00 +0800 https://www.ryantzj.com/posts/android-sandbox-and-ipc/ How does Android Sandbox work and how does Android IPC work? I am answering two questions from what I have learned from various sources.