Steganography is the technique of hiding a secret message within an ordinary message or file. It conceals the very presence of communication, unlike cryptography which only conceals the contents of the message. There are various types of steganography including text, image, audio, and video. Image steganography techniques include least significant bit insertion where the least significant bit of image file bytes are replaced with bits of the secret message. Audio steganography hides messages in audio files or spectra by techniques like embedding messages in the inaudible frequency range. Video steganography takes advantage of large amounts of data that can be hidden in videos which are collections of images and sounds in continuous flow.

1. Presented
By:-
Sanoj(mu10co13)
Steganography

2. What is steganography?
 Technique of hidden or covered writing
 It is different from cryptography
 We conceal our message inside a cover
message
 Steganography’s 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 M’s 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.

9. Thank You