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Steganography

•Steganography
from the Greek word steganos meaning “covered”
and the Greek word graphie meaning “writing”
•Process of hiding of a secret message within an ordinary message and extracting it at its destination
•Anyone else viewing the message will fail to know it contains hidden/encrypted data

This can be achieved by concealing the existence of information within seemingly harmless carriers or cover
Carrier: Text, Image, Audio, Video, etc.

History Of Steganography
 Steganography ancient origins can be traced back to 440 BC, from the Histories of Herodotus
Demeratus sent a warning about a forthcoming attack to Greece by writing it on a wooden panel and covering it in wax.
Histiaeus, who shaved the head of his most trusted slave and tattooed a message on it. After his hair had grown the message was hidden. The purpose was to instigate a revolt against the Persians

Techniques Of Steganography

Masking and Filtering: Information is hidden inside of a image using digital watermarks that include information such as copyright, ownership, or licenses.

Algorithms and Transformations: This technique hides data in mathematical functions that are often used in compression algorithms.

Least Significant Bit Insertion:The most common and popular method of modern day steganography is to make use of least  significant bits  of a picture pixel information

 •The detection of steganographically encoded content is called Steganalysis
•Two Ways:
1)Visual Analysis :
Tries to reveal the presence of secret communication through inspection, either with the naked eye or with the assistance of a computer.
2) Statistical (Algorithmic) Analysis :
Reveals tiny alterations in an image's statistical behavior caused by steganographic embedding.
Makes use of Algorithm or any Encoding method for finding the Alteration.

Steganography Tools
•Steganos
•S-Tools (GIF, JPEG)
•StegHide (WAV, BMP)
•Invisible Secrets (JPEG)
•JPHide
•Camouflage
•Hiderman
•Many others…

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