Recovering a 37-byte flag by reconstructing and inverting an anti-debug-aware Xbyak JIT verifier
Decrypting an 18-byte flag payload by reversing a position-dependent XOR stream derived from a fixed 16-byte key
Extracting embedded bit-vector puzzles from a Next.js bundle, solving them with Z3, and rebuilding the flag keystream
Carving an embedded compiled AppleScript and inverting its bytecode-level character transform to recover the hidden payload
Recovering xorshift128 state from encoded audio tones and removing the PRNG mask to reconstruct the flag
DefCamp D-CTF Final
Deriving an AES-256 key from a hardcoded Windows path and decrypting Pumpkin.html.enc with the fixed IV embedded in the binary
Solving an embedded Sudoku, deriving a row-ordered 27-byte keystream, and XORing the hardcoded ciphertext
The 3th HSACE CLUB LEAGUE Quals
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