2. Stegosaurus: a covered lizard
(but not a type of cryptography)
What is Steganography?
Greek Words:
STEGANOS – “Covered”
GRAPHIE – “Writing”
Steganography is the art and
science of writing hidden messages
in such a way that no one apart
from the intended recipient knows
of the existence of the message.
This can be achieved by concealing
the existence of information within
seemingly harmless carriers or
cover
Carrier: text, image, video, audio,
etc.
3. Types of Steganography
Classification is based on type of cover medium used.
Audio Steganography
Carrier file : any type of audio file
Recipient decodes information by using easily.
Data hiding process consists of following two steps
i. Identification of redundant bits in a cover-file
ii. To embed the secret information in the cover file
Video Steganography
Carrier file : any type of video file
Popularity of sending & receiving files over network.
It is concerned with embedding information in an innocuous
cover media in a secure and robust manner.
4. Use of Steganography
Secure data transmission over the network
Offer deniable storage of information
To store information on desired location
banking information
some military secrets
Used to implement watermarking
Provides a secure yet simple interface for hiding information
4
5. Existing System
Existing System of Audio
i. Phase coding
ii. Parity coding
Disadvantages
Selection of audio formats is restricted to one
message length is restricted to 500 characters
Lack in good user interface
Consume much time to encode and decode
User needs to understand better to know the operations
6. Existing System continued..
Existing System Of video
Embed hidden messages in multimedia objects
Disadvantages
Lack of good user interface.
Non-provision of choosing the key.
More encode-decode time consumption.
Unavailability of programs for particular operating system.
7. Problem Statement
Digitization
Digital media can be transmitted conveniently over the
network.
For hiding secret information in audio and video there
exists a large variety of steganography techniques some
are more complex than others and all of them have
respective strong and weak points.
So we prepare this application, to make the information
hiding simpler and user friendly.
8. Scope of Project
Scope of the project is implementation of steganography
tools for hiding information includes any type of information
file within another file
Provide better security when transmitting or transferring the
data or messages from one end to another
Provide confidentiality and data integrity which requires to
protect against unauthorized access and use
9. Proposed System
Least Significant bit (LSB) Modification
Method
Modifications are made to the least significant bits of the
carrier file’s individual pixels
Example of LSB substitution
(00100111 11101001 11001000)
(00100111 11001000 11101001)
(11001000 00100111 11101001)
Letter 'A' is represented in ASCII format as the binary string
10000011
(00100111 11101000 11001000)
(00100110 11001000 11101000)
(11001001 00100111 11101001)
Advantages 9
10.
Proposed system of Audio
Least Significant Bit (LSB) coding method is the simplest
way to embed secret information in a digital audio file by
replacing the least significant bit of audio file with a binary
message.
Advantages over existing system.
Proposed system of Video
Hiding data in the video image, retrieving the hidden data
from the video using LSB modification method
Advantage over Existing system
LSB coding method is a very high watermark channel bit rate
and a low computational complexity
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