Dvdes-631 -

#!/usr/bin/env python3 import struct, subprocess, sys

$ strings -a dvdes-631 | grep -i flag Flag... dvdes-631

The binary is , non‑PIE , and no stack canary – a perfect candidate for classic return‑oriented or buffer‑overflow exploitation, but the first look suggests the binary never reads more than 8 bytes, so the challenge is about the key validation , not a memory bug. #!/usr/bin/env python3 import struct