https://rfcorner.in/tags/py32/Recent content in PY32 on Dhiru's NotebookHugoenSun, 08 Mar 2026 00:00:00 +0000https://rfcorner.in/posts/voltage-glitching-for-fun-and-profit/Sun, 08 Mar 2026 00:00:00 +0000https://rfcorner.in/posts/voltage-glitching-for-fun-and-profit/<h2 id="why-this-post-exists">Why This Post Exists</h2> <p>I wanted to learn practical voltage fault injection on low-cost MCUs like <strong>WCH CH32V003</strong> and <strong>Puya PY32F003</strong>.</p> <p><img alt="CH32V003 SOP-8 chip" loading="lazy" src="https://rfcorner.in/images/ch32v003-sop8.webp"></p> <p><img alt="CH32V003 SOP-8 pinout" loading="lazy" src="https://rfcorner.in/images/ch32v003j4m6.svg"></p> <h2 id="what-is-voltage-glitching">What is Voltage Glitching?</h2> <p>Voltage glitching is a form of hardware fault injection where very short disturbances are introduced into a device's power supply. These disturbances can cause the CPU to skip instructions, misread memory, or bypass security checks. Researchers commonly use voltage glitching to study the robustness of microcontrollers and secure boot implementations.</p>