$ cat writeup.md…
$ cat writeup.md…
spbctf
Task: an x86-64 C binary gates the flag behind a 7-char check where each expected char is random() % 26 + 'a' from a time-seeded glibc PRNG. Solution: reproduce srandom(time(0)) in the same second, pipe predicted chars to pass the gate, and let the binary print the flag itself instead of reversing its bytecode VM.
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