Steganography : Technique to send secret Data

Steganography is the art and science of hiding information by embedding messages within other, seemingly harmless images or other types of media. 

The word steganography is of Greek origin and means "concealed writing". The first recorded use of the term was in 1499 by Johannes Trithemius in his Steganographia, a treatise on cryptography and steganography disguised as a book on magic. Generally, messages will appear to be something else: images, articles, shopping lists, or some other covertext and, classically, the hidden message may be in invisible ink between the visible lines of a private letter.

Technical Steganography

Technical steganography offers a broad variety of methods. It is nearly impossible to divide up all these methods. & Its uses scientific methods to hide a message, such as the use of invisible ink or microdots and other size-reduction methods.

Some methods of technical steganography are:

Invisible Ink

One of the methods with the longest tradition.

Microdots

A method that can be used to hide up to one page in a dot.

Computer-based Methods

Uses redundant information in texts, pictures, sounds, videos, ... 

Softwares:

1. S Tools

S-Tools hides in a variety of cover media. This software is a good illustration of different versions hiding in different media. These versions cover hiding in BMP, GIF, WAV, and even on unused floppy disk space.

Download:-  http://www.spychecker.com/program/stools.html

2.MP3Stego.

which hides text files within larger text files, and lastly a tool that hides files in MP3s called MP3 Stego

Download:- http://www.petitcolas.net/fabien/steganography/mp3stego/index.html

3.Steganos Suite

Tested one commercial steganography product, Steganos Suite. 

4.Camouflage 2.0 

5.Dmagic.

Hides files and folders on Windows systems