Dvdes-631 Jun 2026

After entering any 8‑byte key we observe:

To verify the above understanding we attach GDB and set a breakpoint at the end of check_key . dvdes-631

All later sub‑keys are derived only from the previous cur . Because the transformation is , we can recover the original key by applying the inverse operation once , using the first sub‑key we just derived. After entering any 8‑byte key we observe: To

Below is a cleaned‑up reconstruction (generated by Ghidra + manual editing). dvdes-631