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Hardware Security Exploit Research – Xbox 360

XBOX 360 advanced glitching - Reverse Engineered using a logic analyzer. - kooscode/srgh-matrix-trinity

Turns out, hardware is pretty susceptible to electrial interference and in specific, digital logic chips like CPU's dont like very noisy or unstable power, data or reset lines.. After install and sucessfull "Glitch", I started to look under the hood how this hack actually works and I connected the Logic Analyzer to the RESET (A), POST (B), CLK (C) and DB2G3 (E) pads of the Matrix board and additionally hooked it up to the XBOX 360's I2C bus SDA and SCL pins to monitor I2C traffic. There are no built-in IP logic on CPLD's to perform frequency multiplication using Phased Lock Loops (PLL) or Digital Clock Managers (DCM's) or other features you typically get for free in FPGA's.. After some serious Google fu and head scratching, I found an archive on Xilinx Forums on a way to DOUBLE the frequency of a digital circuit by phase delaying the signal a little and then XOR'ing an inverse of the delayed signal with the original and boom!

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