python desteger.py.txt 4 file.bmp out.dat
python desteger.py.txt 2 out.dat out2.dat
python desteger.py.txt 1 out2.dat out3.dat
strings out3.dat |head -n2
binwalk out.dat 
dd if=out.dat of=out.7z bs=415554 skip=1
7z x out.7z #type the password seen from strings
cat zip/key