For a comparison point, afl fuzzer actually generates never-seen, valid JPEG files "out of thin air", see http://lcamtuf.blogspot.com/2014/11/pulling-jpegs-out-of-thi... and matching conversation https://hackertimes.com/item?id=8571879
It would be interesting to combine both approaches and (interrupted by the sudden singularity ;-).
For a comparison point, afl fuzzer actually generates never-seen, valid JPEG files "out of thin air", see http://lcamtuf.blogspot.com/2014/11/pulling-jpegs-out-of-thi... and matching conversation https://hackertimes.com/item?id=8571879
It would be interesting to combine both approaches and (interrupted by the sudden singularity ;-).