$ cat writeup.md…
$ cat writeup.md…
ringzer0ctf
Task: a PE32 Windows console binary with debug symbols validates a 6-byte key and prints a flag. Solution: static disassembly shows the input is XOR-transformed in place with 0xD3 and compared to table bytes, then that same transformed buffer is reused as the cyclic XOR key to decrypt the flag blob.
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