wirelesscomunication(rahul-442)

WIRELESS DATA ENCRYPTION AND DECRYPTION FOR SECURED COMMUNICATION USING RF: 

WIRELESS DATA ENCRYPTION AND DECRYPTION FOR SECURED COMMUNICATION USING RF GUIDE PRESENTED BY U.DEVA KUMARI G.RAHUL 08E31A0442

INTRODUCTION: 

INTRODUCTION An embedded system is a combination of software and hardware to perform a dedicated task. Some of the main devices used in embedded products are Microprocessors and Microcontrollers . Microprocessors are commonly referred to as general purpose processors as they simply accept the inputs, process it and give the output.

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In contrast, a microcontroller not only accepts the data as inputs but also manipulates it, interfaces the data with various devices, controls the data and thus finally gives the result. Embedded systems do a very specific task, they can be programmed to do different thing s As everyone in this competitive world prefers to make the things easy and simple to handle, this project sets an example to some extent.

Transmitter BLOCK DIAGRAM: 

Transmitter BLOCK DIAGRAM

Receiver block diagram: 

Receiver block diagram

WORKING: 

WORKING The source information is generated by a key pad and this will be encrypted and is sent to destination through RF communication. The receiving system will check the data and decrypt according to a specific algorithm and displays on the LCD. The RF modules used here are STT-433 MHz Transmitter, STR-433 MHz Receiver, HT640 RF Encoder and HT648 RF Decoder. RF Transmitter is connected to the different sensors through RF Encoder .

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This encoder converts the information from one format into another for the purpose of secrecy and security ,then sends it to the transmitter which will be transmitting. The data which is in the air is an analog value. At the receiving end, the receiver receives this analog value on a single data line and passes this data to the decoder. The decoder does the opposite function of the encoder i.e., it converts the secret code back into original information with the help of an algorithm and gives it to the microcontroller which does the further processing.

MODULE OF the project: 

MODULE OF the project

Rf transmitter: 

Rf transmitter RF Transmitter is connected to the different sensors through RF Encoder. This encoder converts the data into a different format for secrecy and sends it to the transmitter.

RF RECEIVER: 

RF RECEIVER The receiver receives this analog value on a single data line and passes this data to the decoder. The decoder converts the secret code back into original information and gives it to the microcontroller which does the further processing .

POWER SUPPLY: 

POWER SUPPLY The input to the circuit is applied from the regulated power supply The a.c input i.e., 230V from the mains supply is step down by the transformer to 12V and is fed to a rectifier So in order to get a pure d.c voltage, the output voltage from the rectifier is fed to a filter to remove any a.c components present even after rectification. Now, this voltage is given to a voltage regulator to obtain a pure constant dc voltage .

Block diagram of power supply: 

Block diagram of power supply

MODULE OF POWER SUPPLY : 

MODULE OF POWER SUPPLY

AT89S52 MICROCONTROLLER: 

AT89S52 MICROCONTROLLER The AT89S52 is a low-voltage, high-performance CMOS 8-bit microcontroller with 8K bytes of Flash programmable memory. T he AT89S52 is designed with static logic for operation down to zero frequency and supports two software selectable power saving modes The Idle Mode stops the CPU while allowing the RAM, timer/counters, serial port and interrupt system to continue functioning. The power-down mode saves the RAM contents but freezes the oscillator disabling all other chip functions until the next hardware reset.

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Atmel’s AT89S52 Flash Microcontroller offers 8K bytes of in-system reprogrammable Flash Code memory and 2K bytes of EEPROM Data memory. The AT89S52 is normally equipped with the on-chip Flash Code and EEPROM Data memory arrays in the erased state and ready to be programmed.

MODULE OF MICROCONTOLLER: 

MODULE OF MICROCONTOLLER

ADVANTAGES: 

ADVANTAGES No line of sight. Not blocked by common materials, can penetrate most solids and pass through walls. Longer range. Not light sensitive. Not sensitive to weather/environmental conditions.

APPLICATIONS: 

APPLICATIONS Industries are using RF solutions for monitoring, control, process, inventory tracking, data links and bar code reading devices. Commercial wireless applications such as door announcers, security and access systems, gate control, remote activation, score board and paging systems. Automotive companies employing RF for wireless remote control, remote keyless entry and safety applications.

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Consumer products including electronic toys, home security, gate and garage door openers, Intercom, fire and safety systems, and irrigation controllers. Medical products like patient call and monitoring, handicap assistance device, surgery. Communication system, remote patient data logging and ECG monitor.

CONCLUSION: 

CONCLUSION Hence by this we can say that wireless data encryption and decryption using RF is provided with a effective security for data communication by designing standard algorithm for encryption and decryption.