Tangle-it encrypts pictures and graphic files.
Tangle-It takes your picture files and tangles their contents and file names so they can neither be viewed nor identified as picture files.  It supports most image file formats.(BMP, CUT, DIB, GIF, HRZ, IFF, IMG, JPG, JP, JPEG, LBM, PCX, PIC, RAS, RLE, TGA, TIF, AVI, MPG et MPEG.