I can do that — I’ll need the challenge binary (and any sample inputs or related files) to analyze. Please upload the executable (and tell me the target platform/architecture if you know it).

Planned approach once you upload the file:

• Static analysis (Ghidra) to locate the check routine, constants, and algorithm.
• Dynamic analysis in a Linux sandbox (run/trace/emulate) to confirm behavior and try inputs (angr/qiling if needed).
• Combine results to produce the exact input that passes the challenge and a brief explanation of how it was derived.

If you have any constraints (no network, time limits, intended input format), tell me now. After you upload the binary I’ll start and report progress.