GPT-6 Astra autonomously decrypted an unbroken Enigma message (Nr. 172, MVUEH) by analyzing historical ciphertexts, identifying a repeated place name crib (ROSENOW), and developing custom Enigma simulator and Bombe software. Carter Leffer prompted the AI to attempt the task, but the system independently selected the target and executed the cryptanalysis.
A custom 32-bit CPU encrypted at gate-level with anti-tamper and anti-debug protections went unsolved for a year by humans and multiple LLMs, until GPT-6 solved it in 20-30 minutes using side-channel cryptanalysis to exploit weak encryption protecting the CPU state. The challenge featured a virtual architecture with 16 general-purpose registers, bit-addressable memory, and obfuscated VHDL synthesis.
Technical paper describing a hardware architecture for accelerating arbitrary-precision integer arithmetic using a 2D spacetime matrix design to overcome Von Neumann bottlenecks in modular arithmetic operations at 10 GHz clock speeds.