The document provides an overview of steganography, detailing its definition as well as its historical techniques. It discusses various types of steganography, characteristics of the methods, and includes information on least significant bit (LSB) steganography with practical demonstrations. Additionally, it lists several tools available for implementing steganographic techniques.

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Agenda
01 What is Steganography?
02 History of Steganography
03 Basic Steganographic Model
04 LSB Steganography - Demo
05 Steganography Tools

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What is Steganography?

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What is Steganography?
Data is hidden in the
plain sight

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What is Steganography?
Cryptography
Board meeting is
happening on Tuesday. We
are meeting at 40.7127 S,
74.0059 E
Uksb klsmnc ou fghmhnvb
gh sdeygdh. eu sfhd
vbsnmrig st lolmnar K,
dgfhal V
Board meeting is
happening on Tuesday. We
are meeting at 40.7127 S,
74.0059 E
Sender Receiver

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What is Steganography?
Cryptography
Sender ReceiverIntruder understands that
secret message is being sent
Uksb klsmnc ou
fghmhnvb gh sdeygdh

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What is Steganography?
Steganography is the art and science of embedding secret messages in cover message in such a way that no one,
apart from the sender and intended recipient, suspects the existence of the message
Sender ReceiverIntruder will not get to know of the
existence of secret message

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History of Steganography

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Steganographic Tecniques
Steganography
STEGANOS GRAPHEN
Concealed or
Hidden
Drawing or
Writing
Null CipherWax Tablet Invisible Ink Microdots Semagrams
20191800

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Steganography Types
Text
Steganography
Image
Steganography
Audio
Steganography
Email
Steganography Network
Steganography
Video
Steganography

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Characteristics of Steganographic Techniques
Transparency
Robustness
Tamper Resistance
Original Image Stego Image

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Basic Steganographic Model

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Basic Steganographic Model
Cover File(X)
Steganographic
Encoder
f(X,M,K)
Secret
Message(M)
Secret
Message(M)
Stego
Object
Key(K)
Steganographic
Decoder
Communication
Channel
Stego Object

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Steganographic Model: With Encryption
Encryption
Algorithm
Steganographic
Encoder
Decryption
Algorithm
Communication
Channel
Steganographic
Decoder
Message
Key
RECEIVER
Message
Cypher
Text
Cypher
Text
Key Stego Key
Stego Key Cover File
Stego Object
Stego Object
SENDER

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LSB Steganography

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Pixels & Bits
Pixel
R
G
B
1 0 1 1 0 1 1 1
1 1 0 1 1 0 0 1
1 0 1 0 0 1 0 0
Total: 24 Bits

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Least Significance Bit Steganography
1 1 1 1 1 1 1 1
Most Significant
Bit(MSB)
Least Significant
Bit(LSB)
Value: 255
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1
0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0
255
127
255
254
If we change MSB, it will have larger impact on final value. If we change LSB, the impact on final value
is very less
Change in bytes is 99.99999% Change in bytes is 0.000002%

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Least Significant Bit Steganography
1 0 0 0 0 0 1Secret message to hidden:
Letter ‘A’
Pixels before insertion(3 pixels)
Least Significant Bit Steganography(LSBS) involves overwriting the bit with the lowest arithmetic value
Pixels after insertion
10000000 10100100 10110101
10110101 11110011 10110111
11100111 10110011 00110011
10000001 10100100 10110100
10110100 11110010 10110110
11100110 10110011 00110011

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Demo

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Least Significant Bit Steganography - Demo
1 Loads an image and looks at each pixels in hexadecimal value.
2 Converts secret text into bits and stores them in LSB of pixel bits
3 A delimiter is added to the end of the edited pixel values
4
To encode the text into image
To decode the text from image
While retrieving all the 0’s and 1’s extracted until delimiter is found.
Extracted bits are converted into string(secret message)

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Steganography Tools

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Steganographic Tools
Tool Description
Stegosuite Hide text inside any image
Stegohide Hide secret file in image or audio file.
Xiao Steganography Free software that can be used to hide secret files in BMP
images or in WAV files.
SSuite Picsel Portable application to hide text inside image file
OpenPuff Tool to conceal files in image, audio & flash files
Camouflage Tool that lets you hide any type of file inside of file.

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