These are chat archives for gwydirsam/DickGrayson

5th
May 2015
Martin Fracker, Jr.
@Towerism
May 05 2015 03:00
Were you testing it just on greyscale images or color images as well?
Well nvm. That's weird.
Sam Gwydir
@gwydirsam
May 05 2015 21:43
Hey @/all I need help writing your sections of the report
I need technical explanations of your code.
Sam Gwydir
@gwydirsam
May 05 2015 21:50
If you can, just write it directly into share/report/report.org, it's all plaintext
I'm using develop
Martin Fracker, Jr.
@Towerism
May 05 2015 22:08
  • Steganography
    Our steganography tool, Munchkinsteg, supports two different embedding media: 8-bit Windows BMP (image), and PCM 16-bit WAV (sound). Both types of steganography are based on last significant bit (LSB). Before embedding the message, we append the null byte to it. When extracting, we stop at the null byte and return everything extracted minus the null byte.
    Windows BMP
    Our tool supports only 8-bit BMP images which means only one subpixel per pixel. We used the EasyBMP library for interfacing with the BMP format. The LSB of each subpixel (and thus each pixel) contains one sequential bit of the embedded message.
    PCM 16-bit WAV
    Our tool supports only PCM 16-bit WAV images. There are other types of WAV images; compression and rounding issues prevent LSB steganography from working correctly. We used libsndfile for interfacing with the WAV format. The WAV format consists of an array of 16-bit sound samples. The LSB of each sound sample contains one sequential bit of the embedding message.
  • Steganography
    Our steganography tool, Munchkinsteg, supports two different embedding media: 8-bit Windows BMP (image), and PCM 16-bit WAV (sound). Both types of steganography are based on last significant bit (LSB). Before embedding the message, we append the null byte to it. When extracting, we stop at the null byte and return everything extracted minus the null byte.
    • Windows BMP
      Our tool supports only 8-bit BMP images which means only one subpixel per pixel. We used the EasyBMP library for interfacing with the BMP format. The LSB of each subpixel (and thus each pixel) contains one sequential bit of the embedded message.
    • PCM 16-bit WAV
      Our tool supports only PCM 16-bit WAV images. There are other types of WAV images; compression and rounding issues prevent LSB steganography from working correctly. We used libsndfile for interfacing with the WAV format. The WAV format consists of an array of 16-bit sound samples. The LSB of each sound sample contains one sequential bit of the embedding message.
Sam Gwydir
@gwydirsam
May 05 2015 22:08
Looks good have you put that in the file?
Martin Fracker, Jr.
@Towerism
May 05 2015 22:09
no i haven't
Sam Gwydir
@gwydirsam
May 05 2015 22:09
Just go ahead and add it
Martin Fracker, Jr.
@Towerism
May 05 2015 22:09
Alright
I'll put it in the report org yes?
Sam Gwydir
@gwydirsam
May 05 2015 22:10
yessir
Martin Fracker, Jr.
@Towerism
May 05 2015 22:34
I pushed
Sam Gwydir
@gwydirsam
May 05 2015 22:37
got it
Christopher Findeisen
@Atrus7
May 05 2015 23:24
From a piazza instructor thing: "you can work on the presentation after submitting the final release of the tools. "