$ cat writeup.md…
$ cat writeup.md…
RingZer0 CTF
Task: two files encrypted with the custom RC8 64-bit Fibonacci-LFSR stream cipher sharing one key but using per-file seeds, with a known-plaintext poem crib. Solution: recover the keystream bit stream, solve the 64 key taps over GF(2), then brute-force the flag file's 24 unknown high seed bits anchored on the 'FLAG-' prefix.
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