$ cat writeup.md…
$ cat writeup.md…
spbctf
Task: ELF64 C binary RC4-decrypts a fixed 19-byte ciphertext 100000 times with keys \"0\"..\"99999\", writing each candidate to /dev/null. Solution: reimplement RC4 (KSA+PRGA) in Python, brute-force all 5-digit keys padded with the sprintf NUL terminator to length 6, and select the only fully-printable plaintext.
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