Introduction about the science of steganography, hiding, and its different from cryptography. How to hide data into images using Least Significant Bit method on different image types, True color, grey scale, and palette (indexed or GIF). BETTER TO DOWNLOAD BECAUSE OF MOTIONS

1. Steganography
Hiding data into digital images
By: Abdulrazak Zakieh

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3. ?
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4. OK
An escape plan
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5. Steganalysis
An escape plan
Cover message
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6. Cover message
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7. Cover message
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8. My friend Bob,
until yesterday I was using binoculars for stargazing. Today, I decided to try my new
telescope. The galaxies in Leo and Ursa Major were unbelievable! Next, I plan to check
out some nebulas and then prepare to take a few snapshots of the new comet.
Although
I am satisfied with the telescope, I think I need to purchase light pollution filters to
block the xenon lights from a nearby highway to improve the quality of my pictures.
Cheers,
Alice.
Alice
Bob
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9. My friend Bob,
until yesterday I was using binoculars for stargazing. Today, I decided to try my new
telescope. The galaxies in Leo and Ursa Major were unbelievable! Next, I plan to check
out some nebulas and then prepare to take a few snapshots of the new comet.
Although
I am satisfied with the telescope, I think I need to purchase light pollution filters to
block the xenon lights from a nearby highway to improve the quality of my pictures.
Cheers,
Alice.
Alice
Bob
mfbuyiwubfstidttmnttgilaumwuniptcosnatpttafsotncaiaswttitintplpftbt
xlfanhtitqompca.
π = 3.141592653589793 . . .
buubdlupnpsspx.attack tomorrow.
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10. Hiding data
Marked
Message
Original
data
Attack
tomorrow
buubdlupnp
sspx
…….
My friend Bob,
until yesterday I was using binoculars for stargazing. Today, I
decided to try my new
telescope. The galaxies in Leo and Ursa Major were
unbelievable! Next, I plan to check
out some nebulas and then prepare to take a few snapshots of
the new comet. Although
I am satisfied with the telescope, I think I need to purchase
light pollution filters to
block the xenon lights from a nearby highway to improve the
quality of my pictures.
Cheers,
Alice.
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11. Linguistic steganography
acrostic
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13. 1. Write after the end of file
010100111010101010
100001010101010101
……………………………..
010100111010101011
EOF
Hidden data
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14. 2. LSB
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LSB

15. 2. LSB
SequentiallyRandomly
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16. 2. LSB
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17. 2. LSB
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True Color
Grey Scale
Black and White
Palette (indexed, GIF)

18. 3. Steganography in palette images
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GIF Indexed
3 1 14 4 112 33 200
. .. ..ff3412
93f32e
321132
..
..
23441a
0
255

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3. Steganography in palette images
Hiding into indices matrix by preprocessing palette:
LSB
×128, 64, 32 colors
1, 2, 3 bits
S-Tools
High capacity
Low security

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References:
Jessica Fridrich - Steganography in Digital Media _ Principles,
Algorithms, and Applications- Cambridge University Press (2010)

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Thanks for your listening