2. What is steganography? Technique of hidden or covered
writing It is different from cryptography We conceal our message
inside a cover message Steganographys goal is to keep the presence
of a message secret
3. Steganography System Figure 1: Steganographic System
4. Types of steganography Text Steganography Image
Steganography Audio Steganography Video Steganography
5. Text Steganography Our secret message may be the 1st or nth
character of the stego message. Example-Susan eats truffles. Under
pressure, that helps everything before 0wning Major Bullwinkle.
real or secret message Set Up the b0MB Tool:snow- used to conceal
messages in ASCII text by appending white-space to the end of
lines.
6. Image Steganography In image steganography we hide our
information bits in image. Methods -Least significant bit insertion
:- In this method the LSB of a byte is replaced with an Ms bit. To
the human eye ,the resulting image will look identical to the cover
object.
7. Audio Steganography Messages can be hidden in common audio
formatted files or the audio itself. It is more difficult process
than image steganography. Methods 1. Transmitting a message in the
human- inaudible audio spectrum. 2. Digitally embedding a message
into an audio file. -Tool: S-Tool 4
8. Video Steganography Video files are generally a collection
of images and sounds.The great advantages of video are the large
amount of data that can be hidden inside and the fact that it is a
moving stream of images and sounds. Therefore, any small but
otherwise noticeable distortions might go by unobserved by humans
because of the continuous flow of information.
