$ cat writeup.md…
$ cat writeup.md…
spbctf
Task: a Windows crackme exposes only an instruction trace and a CRC32-based checker, so the challenge is to recover the original checked string rather than invert a final checksum. Solution: parse the per-bit branch decisions inside the bitwise CRC32 loop and reconstruct each input byte from the evolving CRC state until both checked strings are recovered.
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$sign in$ grep --similar