As we enter the age of universal electronic connectivity, electronic eavesdropping and electronic fraud threaten the prosperity of corporations and individuals. Thus, the role of digital security has become increasingly important. The security requirements within an organization have undergone major changes in the last few decades. Before the widespread use of data processing equipment, data and information valuable to an organization were made invulnerable primarily by physical and administrative means. With the advent of computer networks and the internet however, the design of automated tools which ensure security and privacy of information transferred across networks was inevitable. Though there are several security techniques in use, two of the most prominent ones are steganography and cryptography. In this paper , we discuss these two techniques and how their combination can result in an efficient and secure data transfer software.

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SECURED WIRELESS DATA TRANSMISSION

ELECTRONICS AND COMMUNICATION
By
GURUPRASAD H 4JC06EC037
KARTHIK D 4JC06EC042
KULDEEP M S 4JC06EC047
MADHUSOODANA BADIKILLYA M 4JC06EC049
Under the guidance of
Smt. B. A SUJATHA KUMARI
Assistant Professor
Department of Electronics and Communication Engineering
SJCE, Mysore

DEPARTMENT OF ELECTRONICS AND COMMUNICATION
ENGINEERING
SRI JAYACHAMARAJENDRA COLLEGE OF ENGINEERING
MYSORE-570006
2009-2010

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ABSTRACT


Security is a critical issue in wireless applications both for the users and providers of such systems. A data transmission system, wherein a text data is being transmitted generally adopts cryptography to ensure secure communication over a media.
This project is used to transmit a text message from one place to another place using wireless system. The text message obtained by the keypad is encrypted by using the Microcontroller and the encrypted message is transmitted through wireless system. At the receiver end, the signal is received by the standard receiver and the analog signal is fed to the Microcontroller and it is decrypted by the Microcontroller and the message is displayed over the LCD display. For the efficient data transmission we have used amplitude shift keying (on-off keying). We can use several receivers and the message from the transmitter can be sent to the entire receivers at the same time. Each receiver can be accessed separately by its address. The Microcontroller is used to do the above work. It gets data from the Keyboard and encrypts with a private algorithm. The encrypted message is displayed at the transmitter using an LCD display. At the receiver end the Microcontroller decrypts it with the same algorithm and displays the data over the LCD display.