$ cat writeup.md…
$ cat writeup.md…
spbctf
Task: not-stripped C ELF that RC4-decrypts a 24-byte stack-stored ciphertext using numeric keys 0..99999. Solution: recognize RC4 KSA/PRGA in the mangled hooyeah/yahoo functions, reimplement RC4 in Python, and brute-force all keys filtering for a printable plaintext (key 47284).
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