Embed Size (px)
Citation preview
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 1/23
Steganography“Steganos Graphien ”
T. Deepa
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 2/23
Steganography Copyright (c) 2005, T. Deepa 2
Agenda
• Steganography: An Overview
• Steganography over the ages
• Digital Steganography – Text
– Images
– Audio
– Video
• Applications and Trends
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 3/23
Steganography Copyright (c) 2005, T. Deepa 3
Steganography: An Overview
• Steganos – Covered + Graphien – Writing• Art and Science of Information Hiding and
Transmission
• Goal: To conceal existence of message• A simple example:
– Sure! Eat Truffles. Under pressure, that helpseveryone. Bread often makes brighter...
– Sure! Eat Truffles. Under pressure, that helps
everyone. Bread often makes brighter...
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 4/23
Steganography Copyright (c) 2005, T. Deepa 4
Agenda
Steganography: An Overview
Steganography over the ages
• Digital Steganography – Text
– Images
– Audio
– Video
• Applications and Trends
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 5/23
Steganography Copyright (c) 2005, T. Deepa 5
Steganography over the ages
• Ancient Times
– Tattooed Heads
– Wax-covered Tablets
– Holed books
– Hieroglyphics
– Invisible inks
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 6/23
Steganography Copyright (c) 2005, T. Deepa 6
• Middle Ages
– Invisible inks
– Steganographia
– Treatise by Bishop John Wilkins
– Cardano Grille
Steganography over the ages
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 7/23
Steganography Copyright (c) 2005, T. Deepa 7
• Cardano Grille
Steganography over the ages
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 8/23
Steganography Copyright (c) 2005, T. Deepa 8
Steganography over the ages
• Modern Times
– Invisible inks
– Null Ciphers
• Jargon Codes
• Document Layouts
– Microdots
Microdot camera Mark IV
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 9/23
Steganography Copyright (c) 2005, T. Deepa 9
Agenda
Steganography: An Overview
Steganography over the ages
Digital Steganography – Text
– Images
– Audio
– Video
• Applications and Trends
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 10/23
Steganography Copyright (c) 2005, T. Deepa 10
Digital Steganography
Hide sensitive-information
In cover-medium
Combine with stego-system
Result is stego- medium
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 11/23
Steganography Copyright (c) 2005, T. Deepa 11
Digital Steganography
• Text – Applying distortion techniques
• Image
– Manipulating the human mind’sperspective process
• Audio – Masking, Echo Hiding
• Video – Hiding data in “noise” from compression,
redundant data, or patterns in format
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 12/23
Steganography Copyright (c) 2005, T. Deepa 12
Digital Steganography: Text
• Preexisting Text – Changing the formatting of an existing
text
– Changing words within a text
• Generated Text
– Generating random character sequences – Using context-free grammars to generate
readable texts
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 13/23
Steganography Copyright (c) 2005, T. Deepa 13
Digital Steganography: Images
• Human brain cannot decipher nearlyidentical colors (Similarity)
• Missing portions are automatically
filled in (Closure)
(255,0,0)
(252,0,0)
(255,0,0)
(252,0,0)
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 14/23
Steganography Copyright (c) 2005, T. Deepa 14
Digital Steganography: Images
• Lossless compression image stego-systems
– BMP, GIF…
• Binary Images
• Red Green Blue (RGB) Model – Least Significant Bit Insertion
• Lossy compression image stego-systems
– JPEG
• Discrete cosine transformation
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 15/23
Steganography Copyright (c) 2005, T. Deepa 15
Digital Steganography: Images
A 1k file embedded using F5 steganographytool Courtesy: LINGUISTIC STEGANOGRAPHY: SURVEY, ANALYSIS, AND ROBUSTNESS
by Krista Bennett
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 16/23
Steganography Copyright (c) 2005, T. Deepa 16
Digital Steganography: Images
Poor Cover-ImageGood Cover-Image
Courtesy: STEGANOGRAPHY PRIMER
By Computer Academic Background
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 17/23
Steganography Copyright (c) 2005, T. Deepa 17
Digital Steganography: Audio
• Techniques:
– Masking
– Adding noise to audible signal
– Echo Hiding
• Relatively easier to detect
• Greater degradation in cover media
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 18/23
Steganography Copyright (c) 2005, T. Deepa 18
Digital Steganography: Audio
Courtesy: LINGUISTIC STEGANOGRAPHY: SURVEY, ANALYSIS, AND ROBUSTNESS
by Krista Bennett
A 13k audio file is embedded into a 168k .wavfile using Steganos
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 19/23
Steganography Copyright (c) 2005, T. Deepa 19
Digital Steganography: Video
• Visual Clues
– Hand/Foot Positions
– Eye-Blink Codes
• Digital data embedding
– Video = Image + Audio
– Large amounts of data can be hidden
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 20/23
Steganography Copyright (c) 2005, T. Deepa 20
Agenda
Steganography: An Overview
Steganography over the ages
Digital Steganography
Text
Images
Audio
Video
Applications and Trends
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 21/23
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 22/23
Steganography Copyright (c) 2005, T. Deepa 22
Applications and Trends
• Steganography & Cryptography
– Steganography Cryptography
– Cryptography: Make message unreadable
– Steganography: Make message hidden
– Cryptography + Steganography
8/2/2019 Deepa T - Steganography
http://slidepdf.com/reader/full/deepa-t-steganography 23/23
Steganography Copyright (c) 2005, T. Deepa 23
Agenda
Steganography: An Overview
Steganography over the ages
Digital Steganography
Text
Images
Audio
Video
Applications and Trends
