The Importance Of Steganography

ABSTRACT: Steganography is the art and science of sending covert messages such that the existence and nature of such a message is only known by the sender and intended recipient. Steganography has been practiced for thousands of years, but in the last two decades Steganography has been introduced to digital media. Attacks, misuse or unauthorized access of information is of great concern today which makes the protection of documents through digital media is a priority problem. It is the art of hiding message inside a multimedia block. Data hiding can be done in different medias like text, images and audio valid data or not. This urges the researcher’s to devise new data hiding techniques through Steganography principle to protect and secure the data of vital significance. This paper we focus simple review Steganography

INTRODUCTION

Steganography is the art and science of writing hidden messages in such a way that no one, apart from the sender and intended recipient, suspects the existence of the message, a form of security through obscurity . The word Steganography is of Greek origin and means “concealed writing” from the Greek words steganos meaning “covered or protected”, and graphing meaning “to write”. Steganography is the technique of hiding the message in a chosen carrier such that no one except the intended recipient is aware of its existence.

Secrecy: Extraction of hidden data from the host medium should not be possible without the knowledge of the proper secret key used in the extracting procedure.

Imperceptibility: After embedding the data in the medium, it should be imperceptible from the original medium.

High capacity: The maximum length of the hidden message that can be embedded can be as long as possible.

Resistance: The hidden data should be able to survive when the host medium has been manipulated, for example lossy compression scheme.

Accurate extraction: The extraction of the hidden data from the medium should be accurate and