Hi, I’m Jon.

I’m a software engineer and security researcher.

Some topics from my current and past work include:

• iOS exploits;
• compilers & decompilers;
• operating system development; and
• copy protection “research”.

You might be interested in:

• Jon’s Arm Reference
• The Beheading of Madame de Maintenon (2024)
• Respawn (2023)
• Get to Know Your Decompiler (2023)
• Objective Ninja (2022)
• Using CVE-2021-40531 for RCE with Sketch (2021)