$ cat writeup.md…
$ cat writeup.md…
sbpctf
Task: PE32 x86 C crackme that prints a flag computed at runtime via an embedded RC4 cipher with no user input. Solution: recognize the RC4 KSA/PRGA in disassembly, reimplement it in Python with key 'Yahhooo', and XOR the 20-byte keystream against a hardcoded .rdata blob to recover the flag statically.
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