A collaborative computer hacker crew.https://ud2.rip/https://ud2.rip/blog/blackbox/https://ud2.rip/blog/blackbox/dumping avr/atmega328/arduino firmware, pure static analysis, speed ctf solve, xor crib dragging over ciphertext with known plaintext attack, cyberchefMon, 15 Sep 2025 00:00:00 GMTctfhttps://ud2.rip/blog/enigma-protector/https://ud2.rip/blog/enigma-protector/reverse engineering a $200 commercial protection system, only to discover they protected the installer instead of the software. the crack is copying files.Fri, 05 Dec 2025 00:00:00 GMTreversinghttps://ud2.rip/blog/pijail/https://ud2.rip/blog/pijail/Bypassing eval-based restrictions, reconstructing forbidden strings, escaping a builtins blacklist, and exploiting memory manipulation to defeat privilege dropping and read the flag.Tue, 09 Sep 2025 00:00:00 GMTctfhttps://ud2.rip/blog/slippy/https://ud2.rip/blog/slippy/Walkthrough of the Slippy web challenge — abusing symlink extraction in ZIP uploads to escape the sandbox and retrieve the flag.Tue, 09 Sep 2025 00:00:00 GMTctfhttps://ud2.rip/blog/towerunite/https://ud2.rip/blog/towerunite/tower unite protected its backend handshake with hand-rolled rsa: a toy key generator, a 509-bit modulus, and a decrypt routine that leaked uninitialized heap. i factored the key over a weekend on my friends' gaming pcs and read the whole protocol off the wire against an unmodified client. the break, the bugs that made it easy, the surprisingly fast fix, and the mitm still left open.Tue, 09 Jun 2026 00:00:00 GMTreversinggamehackingcryptographyhttps://ud2.rip/blog/vsrg/https://ud2.rip/blog/vsrg/how we used math, reinforcement learning, and social engineering to build a universal rhythm game cheat, climb to top 20 worldwide, and get banned without ever being detected.Thu, 29 Jan 2026 00:00:00 GMTreversinggamehacking