David Ryskalczyk
Security Consultant at IOActive, Inc.
United States
Summary
🤩
Rockstar🎓
Top SchoolDavid Ryskalczyk is a Security Consultant with 12 years of hands-on experience bridging systems administration, embedded systems, and offensive security at IOActive and Temple University. He combines deep operational knowledge of large university IT environments with firmware- and driver-level IoT expertise, contributing to notable open-source projects that modify handheld radio firmware and macOS Xbox 360 drivers. That low-level hardware and driver work informs his security consulting, giving him an uncommon ability to assess risks from silicon to application. He holds a B.S. in Computer Science and an M.S. in Electrical Engineering from Temple University, reflecting a strong hardware-software foundation. Colleagues rely on him for practical, auditable remediation plans grounded in real device reverse-engineering and systems experience.
12 years of coding experience
5 years of employment as a software developer
B.S., Computer Science, B.S., Computer Science at Temple UniversityMaster of Science - MS, Electrical Engineering, Master of Science - MS, Electrical Engineering at Temple University College of Engineering
Github Skills (18)
c-language10
firmware10
fm-radio10
iokit10
device-driver10
sys10
embedded10
reverse-engineering10
cprogramming-language10
sdl9
assembly9
radare29
assembler9
i2c9
macos9
Programming languages (22)
Github contributions (5)
360Controller/360Controller
Sep 2013 - Nov 2015
TattieBogle Xbox 360 Driver (with improvements)
Role in this project:
Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:23 commits, 1 PR, 4 pushes in 2 years 2 months
Contributions summary:David primarily focused on developing and modifying the Xbox 360 controller driver for macOS. Their work involved core changes to the Feedback360 plugin, including ignoring certain flags, rewriting the force feedback functionality, and adding independent motor control. They also integrated and tested rumble functionality using an SDL library, indicating a focus on hardware interaction and low-level control. The commits demonstrate a deep understanding of device drivers and force feedback mechanisms.
improvementsxboxwindowsxbox-360
travisgoodspeed/md380tools
Jun 2016 - Jul 2017
Firmware patches for the TYT-MD380 handheld radio.
Role in this project:Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:32 commits, 1 PR, 19 pushes in 1 year 1 month
Contributions summary:David primarily contributes to firmware patches for the TYT-MD380 handheld radio. Their commits demonstrate a focus on modifying and enhancing the device's functionality, including adding hooks for I2C communication, making corrections to radare2 scripts, and integrating vocoder patches. The user also incorporated minor improvements related to Windows compatibility and other merging tasks. Additionally, the user has shown involvement in annotating code using radare2.
patchedpythonfirmwarepython-toolstyt
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