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Steganography
Definition:
In Greek
Steganos = covered
Graphein = to write
Steganography is an art of secure communication where a message file is embedded in a carrier file and is send to the destination without the knowledge of third person
Carrier file can be image file.
Cryptography:
1) Message is not hidden
2) Enemy can intercept the message
3) Enemy can decrypt the message
Steganography:
1) Message is hidden
2) Enemy must discover the medium
DESIGNING PROCESS
 What formats can be supported
 What can I conceal in a image
 How does it work
what platforms are supported
 System Configuration
 Operating System:
Windows NT/XP/2000 Professional
 Software requirements:
Java JDK1.5 or any other higher versions
 Hardware requirements:
Pentium IV Processor with minimum of 300 MHz.,
Built in Cache of 256 KB,
RAM 128MB
Two Principles:
1) Files can be altered to a certain degree without losing functionality
2) The senses of humanbeings are not acute enough to distinguish minor changes in altered files
CLASS DIAGRAM:
SEQUENCE DIAGRAM:
COLLABORATION DIAGRAM:
STATE DIAGRAM:
CLASS DIAGRAM:
SEQUENCE DIAGRAM:
DATA FLOW
STEGO :
UNSTEGO :
Errors & Exceptions
 INPUT ERRORS:
LOGICAL FLOW :
CONCLUSION & FUTURE ENHANCEMENTS
Conclusion :
 The major direction in steganography is the technique of hiding messages in other files.
 Without a direct comparison of the original and the processed image, it is practically impossible to tell that anything has been changed.
 It is the most important technique that provides security to the maximum extent.
Future Enhancements :
 Another type of file that can be used to hide messages is digitized audio and video files
like WAV and MP3.
 Can also be implemented in other higher
specifications.
APPLICATION AREAS :
 Digital Forensics Examiners
 CBI
 Artificial Intelligence
 Department of Justice
 Air Force
 Navy