PNG Image Steganography with libpng

Grant Curell

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4.96/5 (16 votes)

22 Apr 2013GPL317 min read

62.1K

4.8K

Performing steganography on PNG images

PNG_stego.zip
- PNG_stego
  - Debug
  - LIB Debug
  - libpng-1.2.37-src
    - aclocal.m4
    - ANNOUNCE
    - autogen.sh
    - CHANGES
    - config.guess
    - config.h.in
    - config.sub
    - configure
    - configure.ac
    - contrib
      - gregbook
        
        COPYING
        
        LICENSE
        
        Makefile.mingw32
        
        Makefile.sgi
        
        Makefile.unx
        
        Makefile.w32
        
        makevms.com
        
        README
        
        readpng.c
        
        readpng.h
        
        readpng2.c
        
        readpng2.h
        
        readppm.c
        
        rpng2-win.c
        
        rpng2-x.c
        
        rpng-win.c
        
        rpng-x.c
        
        toucan.png
        
        wpng.c
        
        writepng.c
        
        writepng.h
      - pngminim
        
        decoder
        
        gather.sh
        
        makefile
        
        pngusr.h
        
        README
        
        encoder
        
        dummy_inflate.c
        
        gather.sh
        
        makefile
        
        pngusr.h
        
        README
        
        preader
        
        gather.sh
        
        makefile
        
        pngusr.h
        
        README
      - pngminus
        
        makefile.std
        
        makefile.tc3
        
        makevms.com
        
        png2pnm.bat
        
        png2pnm.c
        
        png2pnm.sh
        
        pngminus.bat
        
        pngminus.sh
        
        pnm2png.bat
        
        pnm2png.c
        
        pnm2png.sh
        
        README
      - pngsuite
        
        basn0g01.png
        
        basn0g02.png
        
        basn0g04.png
        
        basn0g08.png
        
        basn0g16.png
        
        basn2c08.png
        
        basn2c16.png
        
        basn3p01.png
        
        basn3p02.png
        
        basn3p04.png
        
        basn3p08.png
        
        basn4a08.png
        
        basn4a16.png
        
        basn6a08.png
        
        basn6a16.png
        
        README
      - visupng
        
        cexcept.h
        
        PngFile.c
        
        PngFile.h
        
        README.txt
        
        resource.h
        
        VisualPng.c
        
        VisualPng.dsp
        
        VisualPng.dsw
        
        VisualPng.ico
        
        VisualPng.png
        
        VisualPng.rc
    - depcomp
    - example.c
    - INSTALL
    - install-sh
    - KNOWNBUG
    - libpng.3
    - libpng-1.2.37.txt
    - libpngpf.3
    - LICENSE
    - ltmain.sh
    - Makefile.am
    - Makefile.in
    - missing
    - mkinstalldirs
    - png.5
    - png.c
    - png.h
    - pngbar.jpg
    - pngbar.png
    - pngconf.h
    - pngerror.c
    - pnggccrd.c
    - pngget.c
    - pngmem.c
    - pngnow.png
    - pngpread.c
    - pngread.c
    - pngrio.c
    - pngrtran.c
    - pngrutil.c
    - pngset.c
    - pngtest.c
    - pngtest.png
    - pngtrans.c
    - pngvcrd.c
    - pngwio.c
    - pngwrite.c
    - pngwtran.c
    - pngwutil.c
    - projects
      - _UpgradeReport_Files
        
        UpgradeReport.css
        
        UpgradeReport.xslt
        
        UpgradeReport_Error.png
        
        UpgradeReport_Information.png
        
        UpgradeReport_Minus.gif
        
        UpgradeReport_Plus.gif
        
        UpgradeReport_Success.png
        
        UpgradeReport_Warning.png
      - LIB Debug
        
        cl.command.1.tlog
        
        CL.read.1.tlog
        
        CL.write.1.tlog
        
        libpng.lastbuildstate
        
        libpng.log
        
        libpng.unsuccessfulbuild
      - VS2012
        
        LIB Debug
        
        libpng.Build.CppClean.log
        
        libpng.log
        
        libpng.suo
        
        libpng.v11.suo
        
        libpng.vcproj
        
        libpng.vcxproj
        
        libpng.vcxproj.filters
        
        libpng.vcxproj.user
        
        netware.txt
        
        PRJ0041.mak
        
        README.txt
        
        README_zlib.txt
        
        wince.txt
    - README
    - scripts
      - CMakeLists.txt
      - descrip.mms
      - libpng.icc
      - libpng.pc.in
      - libpng.pc-configure.in
      - libpng-config.in
      - libpng-config-body.in
      - libpng-config-head.in
      - makefile.32sunu
      - makefile.64sunu
      - makefile.acorn
      - makefile.aix
      - makefile.amiga
      - makefile.atari
      - makefile.bc32
      - makefile.beos
      - makefile.bor
      - makefile.cygwin
      - makefile.darwin
      - makefile.dec
      - makefile.dj2
      - makefile.elf
      - makefile.freebsd
      - makefile.gcc
      - makefile.gcmmx
      - makefile.hp64
      - makefile.hpgcc
      - makefile.hpux
      - makefile.ibmc
      - makefile.intel
      - makefile.knr
      - makefile.linux
      - makefile.mingw
      - makefile.mips
      - makefile.msc
      - makefile.ne12bsd
      - makefile.netbsd
      - makefile.nommx
      - makefile.openbsd
      - makefile.os2
      - makefile.sco
      - makefile.sggcc
      - makefile.sgi
      - makefile.so9
      - makefile.solaris
      - makefile.solaris-x86
      - makefile.std
      - makefile.sunos
      - makefile.tc3
      - makefile.vcawin32
      - makefile.vcwin32
      - makefile.watcom
      - makevms.com
      - pngos2.def
      - pngw32.def
      - pngw32.rc
      - SCOPTIONS.ppc
      - smakefile.ppc
    - test-pngtest.sh
    - TODO
    - Y2KINFO
  - PNG_encode_decode
    - Debug
      - PNG_encode_decode.Build.CppClean.log
      - PNG_encode_decode.log
    - encode.cpp
    - link.png
    - main.cpp
    - PNG_encode_decode.vcxproj
    - PNG_encode_decode.vcxproj.filters
    - PNG_file.cpp
    - PNG_file.h
    - small.png
  - PNG_stego.sln
  - PNG_stego.v11.suo
  - zlib-1.2.3
    - adler32.c
    - algorithm.txt
    - amiga
      - Makefile.pup
      - Makefile.sas
    - as400
      - bndsrc
      - compile.clp
      - readme.txt
      - zlib.inc
    - ChangeLog
    - check.log
    - compress.c
    - configure
    - contrib
      - ada
        
        buffer_demo.adb
        
        mtest.adb
        
        read.adb
        
        readme.txt
        
        test.adb
        
        zlib.adb
        
        zlib.ads
        
        zlib.gpr
        
        zlib-streams.adb
        
        zlib-streams.ads
        
        zlib-thin.adb
        
        zlib-thin.ads
      - asm586
        
        match.S
        
        README.586
      - asm686
        
        match.S
        
        README.686
      - blast
        
        blast.c
        
        blast.h
        
        Makefile
        
        README
        
        test.pk
        
        test.txt
      - delphi
        
        readme.txt
        
        ZLib.pas
        
        ZLibConst.pas
        
        zlibd32.mak
      - dotzlib
        
        DotZLib.build
        
        DotZLib.chm
        
        DotZLib.sln
        
        DotZLib
        
        AssemblyInfo.cs
        
        ChecksumImpl.cs
        
        CircularBuffer.cs
        
        CodecBase.cs
        
        Deflater.cs
        
        DotZLib.cs
        
        DotZLib.csproj
        
        GZipStream.cs
        
        Inflater.cs
        
        UnitTests.cs
        
        LICENSE_1_0.txt
        
        readme.txt
      - infback9
        
        infback9.c
        
        infback9.h
        
        inffix9.h
        
        inflate9.h
        
        inftree9.c
        
        inftree9.h
        
        README
      - inflate86
        
        inffas86.c
        
        inffast.S
      - iostream
        
        test.cpp
        
        zfstream.cpp
        
        zfstream.h
      - iostream2
        
        zstream.h
        
        zstream_test.cpp
      - iostream3
        
        README
        
        test.cc
        
        TODO
        
        zfstream.cc
        
        zfstream.h
      - masm686
        
        match.asm
      - masmx64
        
        bld_ml64.bat
        
        gvmat64.asm
        
        gvmat64.obj
        
        inffas8664.c
        
        inffasx64.asm
        
        inffasx64.obj
        
        readme.txt
      - masmx86
        
        bld_ml32.bat
        
        gvmat32.asm
        
        gvmat32.obj
        
        gvmat32c.c
        
        inffas32.asm
        
        inffas32.obj
        
        mkasm.bat
        
        readme.txt
      - minizip
        
        ChangeLogUnzip
        
        crypt.h
        
        ioapi.c
        
        ioapi.h
        
        iowin32.c
        
        iowin32.h
        
        Makefile
        
        miniunz.c
        
        minizip.c
        
        mztools.c
        
        mztools.h
        
        unzip.c
        
        unzip.h
        
        zip.c
        
        zip.h
      - pascal
        
        example.pas
        
        readme.txt
        
        zlibd32.mak
        
        zlibpas.pas
      - puff
        
        Makefile
        
        puff.c
        
        puff.h
        
        README
        
        zeros.raw
      - README.contrib
      - testzlib
        
        testzlib.c
        
        testzlib.txt
      - untgz
        
        Makefile
        
        Makefile.msc
        
        untgz.c
      - vstudio
        
        readme.txt
        
        vc7
        
        miniunz.vcproj
        
        minizip.vcproj
        
        testzlib.vcproj
        
        zlib.rc
        
        zlibstat.vcproj
        
        zlibvc.def
        
        zlibvc.sln
        
        zlibvc.vcproj
        
        vc8
        
        miniunz.vcproj
        
        minizip.vcproj
        
        testzlib.vcproj
        
        testzlibdll.vcproj
        
        zlib.rc
        
        zlibstat.vcproj
        
        zlibvc.def
        
        zlibvc.sln
        
        zlibvc.vcproj
    - crc32.c
    - crc32.h
    - deflate.c
    - deflate.h
    - example.c
    - example-res.rc
    - examples
      - fitblk.c
      - gun.c
      - gzappend.c
      - gzjoin.c
      - gzlog.c
      - gzlog.h
      - README.examples
      - zlib_how.html
      - zpipe.c
      - zran.c
    - example-static-res.rc
    - FAQ
    - gzio.c
    - INDEX
    - infback.c
    - inffast.c
    - inffast.h
    - inffixed.h
    - inflate.c
    - inflate.h
    - inftrees.c
    - inftrees.h
    - make_vms.com
    - Makefile
    - Makefile.in
    - minigzip.c
    - minigzip-res.rc
    - minigzip-static-res.rc
    - msdos
      - Makefile.bor
      - Makefile.dj2
      - Makefile.emx
      - Makefile.msc
      - Makefile.tc
    - old
      - descrip.mms
      - Makefile.riscos
      - os2
        
        Makefile.os2
        
        zlib.def
      - README
      - visual-basic.txt
      - zlib.html
    - patches
      - foo.gz
      - zlib.ico
      - zlib-1.2.2.diff
      - zlib-1.2.2.diff.log
      - zlib-1.2.3.diff
      - zlib-dllversion.c
      - zlib-ltversion
    - projects
      - VS2012
        
        example.dsp
        
        LIB Debug
        
        zlib.Build.CppClean.log
        
        zlib.log
        
        minigzip.dsp
        
        README.txt
        
        Win32_LIB_Debug
        
        vc110.idb
        
        zlib.dsp
        
        zlib.dsw
        
        zlib.vcxproj
        
        zlib.vcxproj.filters
        
        zlib.vcxproj.user
    - qnx
      - package.qpg
    - README
    - trees.c
    - trees.h
    - uncompr.c
    - win32
      - DLL_FAQ.txt
      - Makefile.bor
      - Makefile.emx
      - Makefile.gcc
      - Makefile.msc
      - VisualC.txt
      - zlib.def
      - zlib1.rc
    - zconf.h
    - zconf.in.h
    - zlib.3
    - zlib.h
    - zlib.ico
    - zlib-dll-res.rc
    - zlib-dllversion.c
    - zlib-ltversion
    - zutil.c
    - zutil.h
libpng_windows_source.zip
- libpng-1.2.37-src
  - aclocal.m4
  - ANNOUNCE
  - autogen.sh
  - CHANGES
  - config.guess
  - config.h.in
  - config.sub
  - configure
  - configure.ac
  - contrib
    - gregbook
      - COPYING
      - LICENSE
      - Makefile.mingw32
      - Makefile.sgi
      - Makefile.unx
      - Makefile.w32
      - makevms.com
      - README
      - readpng.c
      - readpng.h
      - readpng2.c
      - readpng2.h
      - readppm.c
      - rpng2-win.c
      - rpng2-x.c
      - rpng-win.c
      - rpng-x.c
      - toucan.png
      - wpng.c
      - writepng.c
      - writepng.h
    - pngminim
      - decoder
        
        gather.sh
        
        makefile
        
        pngusr.h
        
        README
      - encoder
        
        dummy_inflate.c
        
        gather.sh
        
        makefile
        
        pngusr.h
        
        README
      - preader
        
        gather.sh
        
        makefile
        
        pngusr.h
        
        README
    - pngminus
      - makefile.std
      - makefile.tc3
      - makevms.com
      - png2pnm.bat
      - png2pnm.c
      - png2pnm.sh
      - pngminus.bat
      - pngminus.sh
      - pnm2png.bat
      - pnm2png.c
      - pnm2png.sh
      - README
    - pngsuite
      - basn0g01.png
      - basn0g02.png
      - basn0g04.png
      - basn0g08.png
      - basn0g16.png
      - basn2c08.png
      - basn2c16.png
      - basn3p01.png
      - basn3p02.png
      - basn3p04.png
      - basn3p08.png
      - basn4a08.png
      - basn4a16.png
      - basn6a08.png
      - basn6a16.png
      - README
    - visupng
      - cexcept.h
      - PngFile.c
      - PngFile.h
      - README.txt
      - resource.h
      - VisualPng.c
      - VisualPng.dsp
      - VisualPng.dsw
      - VisualPng.ico
      - VisualPng.png
      - VisualPng.rc
  - depcomp
  - example.c
  - INSTALL
  - install-sh
  - KNOWNBUG
  - libpng.3
  - libpng-1.2.37.txt
  - libpngpf.3
  - LICENSE
  - ltmain.sh
  - Makefile.am
  - Makefile.in
  - missing
  - mkinstalldirs
  - png.5
  - png.c
  - png.h
  - pngbar.jpg
  - pngbar.png
  - pngconf.h
  - pngerror.c
  - pnggccrd.c
  - pngget.c
  - pngmem.c
  - pngnow.png
  - pngpread.c
  - pngread.c
  - pngrio.c
  - pngrtran.c
  - pngrutil.c
  - pngset.c
  - pngtest.c
  - pngtest.png
  - pngtrans.c
  - pngvcrd.c
  - pngwio.c
  - pngwrite.c
  - pngwtran.c
  - pngwutil.c
  - projects
    - _UpgradeReport_Files
      - UpgradeReport.css
      - UpgradeReport.xslt
      - UpgradeReport_Error.png
      - UpgradeReport_Information.png
      - UpgradeReport_Minus.gif
      - UpgradeReport_Plus.gif
      - UpgradeReport_Success.png
      - UpgradeReport_Warning.png
    - LIB Debug
      - cl.command.1.tlog
      - CL.read.1.tlog
      - CL.write.1.tlog
      - libpng.lastbuildstate
      - libpng.log
      - libpng.unsuccessfulbuild
    - VS2012
      - LIB Debug
        
        libpng.Build.CppClean.log
        
        libpng.log
      - libpng.suo
      - libpng.v11.suo
      - libpng.vcproj
      - libpng.vcxproj
      - libpng.vcxproj.filters
      - libpng.vcxproj.user
      - netware.txt
      - PRJ0041.mak
      - README.txt
      - README_zlib.txt
      - wince.txt
  - README
  - scripts
    - CMakeLists.txt
    - descrip.mms
    - libpng.icc
    - libpng.pc.in
    - libpng.pc-configure.in
    - libpng-config.in
    - libpng-config-body.in
    - libpng-config-head.in
    - makefile.32sunu
    - makefile.64sunu
    - makefile.acorn
    - makefile.aix
    - makefile.amiga
    - makefile.atari
    - makefile.bc32
    - makefile.beos
    - makefile.bor
    - makefile.cygwin
    - makefile.darwin
    - makefile.dec
    - makefile.dj2
    - makefile.elf
    - makefile.freebsd
    - makefile.gcc
    - makefile.gcmmx
    - makefile.hp64
    - makefile.hpgcc
    - makefile.hpux
    - makefile.ibmc
    - makefile.intel
    - makefile.knr
    - makefile.linux
    - makefile.mingw
    - makefile.mips
    - makefile.msc
    - makefile.ne12bsd
    - makefile.netbsd
    - makefile.nommx
    - makefile.openbsd
    - makefile.os2
    - makefile.sco
    - makefile.sggcc
    - makefile.sgi
    - makefile.so9
    - makefile.solaris
    - makefile.solaris-x86
    - makefile.std
    - makefile.sunos
    - makefile.tc3
    - makefile.vcawin32
    - makefile.vcwin32
    - makefile.watcom
    - makevms.com
    - pngos2.def
    - pngw32.def
    - pngw32.rc
    - SCOPTIONS.ppc
    - smakefile.ppc
  - test-pngtest.sh
  - TODO
  - Y2KINFO
- zlib-1.2.3
  - adler32.c
  - algorithm.txt
  - amiga
    - Makefile.pup
    - Makefile.sas
  - as400
    - bndsrc
    - compile.clp
    - readme.txt
    - zlib.inc
  - ChangeLog
  - check.log
  - compress.c
  - configure
  - contrib
    - ada
      - buffer_demo.adb
      - mtest.adb
      - read.adb
      - readme.txt
      - test.adb
      - zlib.adb
      - zlib.ads
      - zlib.gpr
      - zlib-streams.adb
      - zlib-streams.ads
      - zlib-thin.adb
      - zlib-thin.ads
    - asm586
      - match.S
      - README.586
    - asm686
      - match.S
      - README.686
    - blast
      - blast.c
      - blast.h
      - Makefile
      - README
      - test.pk
      - test.txt
    - delphi
      - readme.txt
      - ZLib.pas
      - ZLibConst.pas
      - zlibd32.mak
    - dotzlib
      - DotZLib.build
      - DotZLib.chm
      - DotZLib.sln
      - DotZLib
        
        AssemblyInfo.cs
        
        ChecksumImpl.cs
        
        CircularBuffer.cs
        
        CodecBase.cs
        
        Deflater.cs
        
        DotZLib.cs
        
        DotZLib.csproj
        
        GZipStream.cs
        
        Inflater.cs
        
        UnitTests.cs
      - LICENSE_1_0.txt
      - readme.txt
    - infback9
      - infback9.c
      - infback9.h
      - inffix9.h
      - inflate9.h
      - inftree9.c
      - inftree9.h
      - README
    - inflate86
      - inffas86.c
      - inffast.S
    - iostream
      - test.cpp
      - zfstream.cpp
      - zfstream.h
    - iostream2
      - zstream.h
      - zstream_test.cpp
    - iostream3
      - README
      - test.cc
      - TODO
      - zfstream.cc
      - zfstream.h
    - masm686
      - match.asm
    - masmx64
      - bld_ml64.bat
      - gvmat64.asm
      - gvmat64.obj
      - inffas8664.c
      - inffasx64.asm
      - inffasx64.obj
      - readme.txt
    - masmx86
      - bld_ml32.bat
      - gvmat32.asm
      - gvmat32.obj
      - gvmat32c.c
      - inffas32.asm
      - inffas32.obj
      - mkasm.bat
      - readme.txt
    - minizip
      - ChangeLogUnzip
      - crypt.h
      - ioapi.c
      - ioapi.h
      - iowin32.c
      - iowin32.h
      - Makefile
      - miniunz.c
      - minizip.c
      - mztools.c
      - mztools.h
      - unzip.c
      - unzip.h
      - zip.c
      - zip.h
    - pascal
      - example.pas
      - readme.txt
      - zlibd32.mak
      - zlibpas.pas
    - puff
      - Makefile
      - puff.c
      - puff.h
      - README
      - zeros.raw
    - README.contrib
    - testzlib
      - testzlib.c
      - testzlib.txt
    - untgz
      - Makefile
      - Makefile.msc
      - untgz.c
    - vstudio
      - readme.txt
      - vc7
        
        miniunz.vcproj
        
        minizip.vcproj
        
        testzlib.vcproj
        
        zlib.rc
        
        zlibstat.vcproj
        
        zlibvc.def
        
        zlibvc.sln
        
        zlibvc.vcproj
      - vc8
        
        miniunz.vcproj
        
        minizip.vcproj
        
        testzlib.vcproj
        
        testzlibdll.vcproj
        
        zlib.rc
        
        zlibstat.vcproj
        
        zlibvc.def
        
        zlibvc.sln
        
        zlibvc.vcproj
  - crc32.c
  - crc32.h
  - deflate.c
  - deflate.h
  - example.c
  - example-res.rc
  - examples
    - fitblk.c
    - gun.c
    - gzappend.c
    - gzjoin.c
    - gzlog.c
    - gzlog.h
    - README.examples
    - zlib_how.html
    - zpipe.c
    - zran.c
  - example-static-res.rc
  - FAQ
  - gzio.c
  - INDEX
  - infback.c
  - inffast.c
  - inffast.h
  - inffixed.h
  - inflate.c
  - inflate.h
  - inftrees.c
  - inftrees.h
  - make_vms.com
  - Makefile
  - Makefile.in
  - minigzip.c
  - minigzip-res.rc
  - minigzip-static-res.rc
  - msdos
    - Makefile.bor
    - Makefile.dj2
    - Makefile.emx
    - Makefile.msc
    - Makefile.tc
  - old
    - descrip.mms
    - Makefile.riscos
    - os2
      - Makefile.os2
      - zlib.def
    - README
    - visual-basic.txt
    - zlib.html
  - patches
    - foo.gz
    - zlib.ico
    - zlib-1.2.2.diff
    - zlib-1.2.2.diff.log
    - zlib-1.2.3.diff
    - zlib-dllversion.c
    - zlib-ltversion
  - projects
    - VS2012
      - example.dsp
      - LIB Debug
        
        zlib.Build.CppClean.log
        
        zlib.log
      - minigzip.dsp
      - README.txt
      - Win32_LIB_Debug
        
        vc110.idb
      - zlib.dsp
      - zlib.dsw
      - zlib.vcxproj
      - zlib.vcxproj.filters
      - zlib.vcxproj.user
  - qnx
    - package.qpg
  - README
  - trees.c
  - trees.h
  - uncompr.c
  - win32
    - DLL_FAQ.txt
    - Makefile.bor
    - Makefile.emx
    - Makefile.gcc
    - Makefile.msc
    - VisualC.txt
    - zlib.def
    - zlib1.rc
  - zconf.h
  - zconf.in.h
  - zlib.3
  - zlib.h
  - zlib.ico
  - zlib-dll-res.rc
  - zlib-dllversion.c
  - zlib-ltversion
  - zutil.c
  - zutil.h

ml /coff /Zi /c /Flgvmat32.lst  gvmat32.asm 
ml /coff /Zi /c /Flinffas32.lst inffas32.asm

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License

This article, along with any associated source code and files, is licensed under The GNU General Public License (GPLv3)

Written By

Grant Curell

United States

Grant is a specialist in computer security and networking. He holds a bachelors degree in Computer Science and Engineering from the Ohio State University. Certs: CCNA, CCNP, CCDA, CCDP, Sec+, and GCIH.

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