This version of the Independent JPEG Group's JPEG Software (release 4)
has been modifed for 1-bit steganography in JFIF output files.

Steganography is the science of hiding data in otherwise plain text or
images.  Here, we are hiding the data inside images stored in the JFIF
format of the JPEG standard.  It was believed that this type of
steganography was impossible, or at least infeasible, since the JPEG
standard uses lossy encoding to compress its data.  Any hidden data
would be overwhelmed by the noise.  The trick used by this
steganographic implementation is to recognize that JPEG encoding is
split into lossy and non-lossy stages.  The lossy stages use a
discrete cosine transform and a quantization step to compress the
image data; the non-lossy stage then uses Huffmann coding to further
compress the image data.  As such, we can insert the steganographic
data into the image data between those two steps and not risk
corruption.

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 2258    6610  34.2% -lh5- afcf Apr  6  1996 jpeg-v4.jsteg/makefile
[generic]                 1639    3539  46.3% -lh5- d1eb Apr 21  1996 jpeg-v4.jsteg/README.AMIGA
[generic]                10705   26242  40.8% -lh5- 8c1b Dec  8  1992 jpeg-v4.jsteg/SETUP
[generic]                15727   15727 100.0% -lh0- 36a9 Nov  4  1992 jpeg-v4.jsteg/testimg.gif
[generic]                 4374    4374 100.0% -lh0- 1799 Nov  4  1992 jpeg-v4.jsteg/testimg.jpg
[generic]                43171   46890  92.1% -lh5- 6197 Nov  4  1992 jpeg-v4.jsteg/testimg.ppm
[generic]                 4374    4374 100.0% -lh0- 0761 Nov  4  1992 jpeg-v4.jsteg/testorig.jpg
[generic]                 5934   14687  40.4% -lh5- 98c1 Nov 17  1992 jpeg-v4.jsteg/USAGE
[generic]                 2221    6508  34.1% -lh5- 210a Apr  6  1996 jpeg-v4.jsteg/makefile.sas
[generic]                 2334    6938  33.6% -lh5- e5b4 Apr  6  1996 jpeg-v4.jsteg/makefile.unix
[generic]                  905    2526  35.8% -lh5- 6b26 Apr  6  1996 jpeg-v4.jsteg/makefile.vms
[generic]                  755    2548  29.6% -lh5- 25ee Dec  8  1992 jpeg-v4.jsteg/makljpeg.st
[generic]                  115     142  81.0% -lh5- 39c2 Dec  8  1992 jpeg-v4.jsteg/makvms.opt
[generic]                 9039   21128  42.8% -lh5- 93e9 Dec 10  1992 jpeg-v4.jsteg/README
[generic]                 2514    5760  43.6% -lh5- 355c Apr  6  1996 jpeg-v4.jsteg/README.jsteg
[generic]                  833    1453  57.3% -lh5- d491 Dec  8  1992 jpeg-v4.jsteg/makdjpeg.st
[generic]                 2198    6502  33.8% -lh5- f65a Apr  6  1996 jpeg-v4.jsteg/makefile.ansi
[generic]                 2391    7484  31.9% -lh5- c8d7 Apr  6  1996 jpeg-v4.jsteg/makefile.bcc
[generic]                 2122    6294  33.7% -lh5- 74eb Apr  6  1996 jpeg-v4.jsteg/makefile.manx
[generic]                 1981    6036  32.8% -lh5- e148 Apr  6  1996 jpeg-v4.jsteg/makefile.mc5
[generic]                 2355    7497  31.4% -lh5- 4f64 Apr  6  1996 jpeg-v4.jsteg/makefile.mc6
[generic]                 2127    7082  30.0% -lh5- 7252 Apr  6  1996 jpeg-v4.jsteg/makefile.mms
[generic]                 2398    5002  47.9% -lh5- 780c Dec 10  1992 jpeg-v4.jsteg/CHANGELOG
[generic]                 3530    8052  43.8% -lh5- 219c Apr  6  1996 jpeg-v4.jsteg/cjpeg.1
[generic]                 2070    4647  44.5% -lh5- 7f8f Apr  6  1996 jpeg-v4.jsteg/djpeg.1
[generic]                 2131    8314  25.6% -lh5- 07cb Mar 14  1992 jpeg-v4.jsteg/jmemdosa.asm
[generic]                 9317   42751  21.8% -lh5- 2ec0 Apr 11  1996 jpeg-v4.jsteg/jsteg.diff
[generic]                 2684    6740  39.8% -lh5- 50b8 Jun 25  1992 jpeg-v4.jsteg/jwrrle.c
[generic]                 2618    9524  27.5% -lh5- acc9 Jul 17  1992 jpeg-v4.jsteg/jwrtarga.c
[generic]                  833    1453  57.3% -lh5- b6ba Dec  8  1992 jpeg-v4.jsteg/makcjpeg.st
[generic]                 3478   13063  26.6% -lh5- ca29 Dec  2  1992 jpeg-v4.jsteg/jrdppm.c
[generic]                 3468   11363  30.5% -lh5- ee3e Mar  2  1992 jpeg-v4.jsteg/jrdrle.c
[generic]                 4346   13431  32.4% -lh5- 59e9 Dec  2  1992 jpeg-v4.jsteg/jrdtarga.c
[generic]                 4303   14090  30.5% -lh5- 7788 Nov 11  1992 jpeg-v4.jsteg/jrevdct.c
[generic]                 1478    3355  44.1% -lh5- d5d1 Nov  6  1992 jpeg-v4.jsteg/jutils.c
[generic]                 5077   14045  36.1% -lh5- 8977 Jul 27  1992 jpeg-v4.jsteg/jwrgif.c
[generic]                 3974   11967  33.2% -lh5- 6514 Aug  3  1992 jpeg-v4.jsteg/jwrjfif.c
[generic]                 2120    9091  23.3% -lh5- f8f9 Jul 17  1992 jpeg-v4.jsteg/jwrppm.c
[generic]                 9488   37719  25.2% -lh5- 5fca Nov  1  1992 jpeg-v4.jsteg/jmemmgr.c
[generic]                 3078    7779  39.6% -lh5- 57b1 Jul 24  1992 jpeg-v4.jsteg/jmemname.c
[generic]                 1100    2263  48.6% -lh5- 5ddd Feb 29  1992 jpeg-v4.jsteg/jmemnobs.c
[generic]                 3078    7779  39.6% -lh5- 57b1 Apr  6  1996 jpeg-v4.jsteg/jmemsys.c
[generic]                 7355   22021  33.4% -lh5- 05d0 Jul 13  1992 jpeg-v4.jsteg/jquant1.c
[generic]                13634   42194  32.3% -lh5- 5cb9 Nov  4  1992 jpeg-v4.jsteg/jquant2.c
[generic]                 6881   20480  33.6% -lh5- 88f1 Dec  2  1992 jpeg-v4.jsteg/jrdgif.c
[generic]                 7574   23313  32.5% -lh5- 5cc7 Dec  2  1992 jpeg-v4.jsteg/jrdjfif.c
[generic]                 1957    5623  34.8% -lh5- 9ebb Nov 11  1992 jpeg-v4.jsteg/jdmaster.c
[generic]                 2115    6265  33.8% -lh5- 1f0f Nov  1  1992 jpeg-v4.jsteg/jdmcu.c
[generic]                10757   38159  28.2% -lh5- dbff Nov 11  1992 jpeg-v4.jsteg/jdpipe.c
[generic]                 2340    9665  24.2% -lh5- 1725 Nov  5  1992 jpeg-v4.jsteg/jdsample.c
[generic]                 1198    2640  45.4% -lh5- 6191 Nov 14  1992 jpeg-v4.jsteg/jerror.c
[generic]                 3686   11760  31.3% -lh5- 6279 Nov 11  1992 jpeg-v4.jsteg/jfwddct.c
[generic]                 1753    4303  40.7% -lh5- 96d5 Mar 14  1992 jpeg-v4.jsteg/jmemansi.c
[generic]                 5300   17557  30.2% -lh5- 93d2 Jul 27  1992 jpeg-v4.jsteg/jmemdos.c
[generic]                 2293    5993  38.3% -lh5- 4faa Apr  6  1996 jpeg-v4.jsteg/jcmcu.c
[generic]                 6336   26905  23.5% -lh5- a181 Nov 11  1992 jpeg-v4.jsteg/jcpipe.c
[generic]                 3623   16472  22.0% -lh5- 4fbc Nov  5  1992 jpeg-v4.jsteg/jcsample.c
[generic]                  608    1147  53.0% -lh5- ffc4 Nov 11  1992 jpeg-v4.jsteg/jdarith.c
[generic]                 2979    9090  32.8% -lh5- 4ef1 Aug 23  1992 jpeg-v4.jsteg/jdcolor.c
[generic]                 2740    6529  42.0% -lh5- af6f Jul 25  1992 jpeg-v4.jsteg/jddeflts.c
[generic]                 4947   12718  38.9% -lh5- 7034 Apr  6  1996 jpeg-v4.jsteg/jdhuff.c
[generic]                 5072   14114  35.9% -lh5- c211 Apr  6  1996 jpeg-v4.jsteg/jdmain.c
[generic]                 1453    3259  44.6% -lh5- de6b Nov  1  1992 jpeg-v4.jsteg/jbsmooth.c
[generic]                  618    1164  53.1% -lh5- 20e7 Nov 11  1992 jpeg-v4.jsteg/jcarith.c
[generic]                 3093   11236  27.5% -lh5- f902 Aug  8  1992 jpeg-v4.jsteg/jccolor.c
[generic]                 5044   14662  34.4% -lh5- f1cc Nov  5  1992 jpeg-v4.jsteg/jcdeflts.c
[generic]                  871    1948  44.7% -lh5- ef13 Nov  1  1992 jpeg-v4.jsteg/jcexpand.c
[generic]                 6493   20013  32.4% -lh5- d68d Jul 24  1992 jpeg-v4.jsteg/jchuff.c
[generic]                 7625   21354  35.7% -lh5- 1232 Apr  6  1996 jpeg-v4.jsteg/jcmain.c
[generic]                 1568    4206  37.3% -lh5- 2369 Nov 11  1992 jpeg-v4.jsteg/jcmaster.c
[generic]                 6418   16228  39.5% -lh5- 28be Nov  4  1992 jpeg-v4.jsteg/ansi2knr.c
[generic]                  934    2622  35.6% -lh5- 1425 Apr  6  1996 jpeg-v4.jsteg/bitsink.c
[generic]                 1512    3939  38.4% -lh5- 707c Apr  6  1996 jpeg-v4.jsteg/bitsource.c
[generic]                 4019   13021  30.9% -lh5- 4ee1 Jul 24  1992 jpeg-v4.jsteg/ckconfig.c
[generic]                 9744   26879  36.3% -lh5- ea69 Nov 14  1992 jpeg-v4.jsteg/example.c
[generic]                 2176    5401  40.3% -lh5- 30db Mar  2  1992 jpeg-v4.jsteg/jmemsys.h
[generic]                10878   39469  27.6% -lh5- 0abe Dec  2  1992 jpeg-v4.jsteg/jpegdata.h
[generic]                  236     357  66.1% -lh5- 7c22 Dec 10  1992 jpeg-v4.jsteg/jversion.h
[generic]                24800   66550  37.3% -lh5- cf06 Dec  2  1992 jpeg-v4.jsteg/architecture
[generic]                   80      98  81.6% -lh5- 2c02 Apr  6  1996 jpeg-v4.jsteg/bitsink.h
[generic]                   87     127  68.5% -lh5- 3c09 Apr  6  1996 jpeg-v4.jsteg/bitsource.h
[generic]                 4514   12045  37.5% -lh5- 10e0 Apr  6  1996 jpeg-v4.jsteg/jconfig.h
[generic]                 1629    3922  41.5% -lh5- 783c Apr  6  1996 jpeg-v4.jsteg/jinclude.h
[generic]                 2253    5694  39.6% -lh5- 331c Jul 31  1992 jpeg-v4.jsteg/jmemdos.h
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total        84 files  379834 1013911  37.5%            Apr 27  1996