Discussion

Scanned approximately one millon images with improved stegdetect:
  20,000 (2.1%) supposedly JPHide

  1,500 (0.15%) supposedly OutGuess

  70 (0.007%) supposedly JSteg

Stegbreak improvements:
Use file utility to verify password guesses for OutGuess.
Reject password if not a known file type.

Identify file type for JSteg-Shell password guesses.

Only processed JSteg positives without finding any hidden message.