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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.
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Contents of util/crypt/jstegsrc.lha 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
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