Category Archives: Jesting

“A jest’s prosperity lies in the ear of him that hears it, never in the tongue of him that makes it.”

USB Descriptor Glitching with Facedancer21

Over the past week, I have been slowly progressing on glitching USB descriptors of a Trezor ONE. I have succeeded in creating a framework for this, and other USB-based glitching attacks, and will document this work for future reference. As … Continue reading

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The Z80 Adventure Part II

Today, I was able to use the Z80 I built last week to boot Grant Searle’s Z80 BASIC ROM without modifications, with access to both banks of SRAM. You can download this ROM file here. Several core pieces of functionality … Continue reading

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Just for Fun: The Z80 Adventure!

Earlier this week, I realized that I have a single piece of full-size prototyping board left. In a fit of madness, I decided that the best course of action was to build a small Z80 computer on it. The Zilog … Continue reading

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Writeup – flagrom (Google CTF)

This weekend, I participated in Google CTF 2019. I was able to solve one challenge during the time allocated, and the writeup is below. Flagrom Many thanks to netcat for a nudge in the right direction for this challenge. This … Continue reading

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Writeups – products-manager, overfloat (Facebook CTF)

This weekend, I participated in the Facebook CTF event. The quality of challenges in this CTF was decent, but the event was marred by significant connectivity problems, rendering it unplayable for a significant portion of time for me. I solved … Continue reading

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