IRJET- Data Encryption and Decryption using RF Module

International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056
Volume: 06 Issue: 05 | May 2019 www.irjet.net p-ISSN: 2395-0072
© 2019, IRJET | Impact Factor value: 7.211 | ISO 9001:2008 Certified Journal | Page 904
Data Encryption and Decryption using RF Module
Priyanka Jadhav1, Ashwini Jadhav2, Ashwini Indrale3, Dr. S.S. Chorage4
Department of Electronics and Telecommunication Engineering Bharati Vidyapeeth‟s College of Engineering for
Women, Pune-43
-------------------------------------------------------------------------***------------------------------------------------------------------------
Abstract - In this paper, we proposed Data Encryption and Decryption Using RF module. Radio Frequency (RF) is
any of the electromagnetic wave frequencies that lie in the range extending from around 3KHz to 300KHz, which
includes those frequencies used for communication.
Cryptography techniques provide high security to store secret and sensitive data, to transmit to receiver by
sender and vice versa. Data encryption is the process of converting message(plaintext) into meaningless
text(cipher text).Decryption is reverse meaningless data back to the original data (plaintext)that can read or
understand to the receiver. The security is dependent on the key and algorithm which are used to encrypt and
decrypt the message.
Key Words: RF Module, CP Module, Encryption Algorithm, Decryption Algorithm.
INTRODUCTION
For example:
In encryption if we have message h and key is P so encryption process as follows:
h = 104 = 01101000
P = 80 = 01010000 XOR
00111000=56 = 8
To decrypt the cipher text is applied the operation XOR on the cipher text, so that plain text back to its original data.
The resulting cipher text is 8, as for the decryption process then performed the operation XOR between cipher text with a
key so that it returns to the original message.
8 = 56 =00111000
P = 97 = 01100001 XOR
01101000=104=h
Data Encryption and Decryption provide high security which is depends on the algorithm which is used. The basic
principle of Cryptography is defined as: A message being sent is known as plaintext. The message is then coded using a
cryptographic algorithm. This process is called encryption. An encrypted message is known as cipher text, and is turned
back into plaintext by the process of decryption. The method for decryption is the same as that for encryption but in
reverse direction. It is applicable in each phase of encryption.
There are two algorithms used for encryption and decryption, which is mainly done by using ASCII value. In encryption
ASCII value of each character in string is encrypted using subtraction of ASCII values of 1(49), 2(50), 3(51) respectively. In
decryption original data can be derived by addition of ASCII values of 1, 2, 3 resp.
In second method X-OR operation is used for encryption and decryption. In encryption take a binary equivalent of ASCII
value of each character in sting and perform the X-OR operation binary equivalent of ASCII value of key “P”.
Security is essential factor during communication among the people and in e-commerce for the internet user applications
such as private communication, password protection and secured e-commerce. The need of secure communication i.e.,
with Cryptography techniques provides high security like internet banking, ATM‟s and Satellite transmission etc.

METHODOLOGY
At transmitter side we are using Laptop, CP module, Microcontroller and RF transmitter. First data will be send to
controller through the CP module. CP module is used for the serial communication. The data will encrypt and it will
transmitted through RF transmitter Module. At receiver end the data is received by RF receiver module. That data will
send to the microcontroller. Then data will decrypt and it will send through the CP module to the laptop. Hence the data
will get in original form.
ENCRYPTION ALGORITHM
For method 1.
1. START
2. Fetch the string to be encrypts
3. Calculate the ASCII value of each character in the string
4. Calculate the ASCII value of 1
5. Subtract ASCII value of 1from each character in the string
6. Put the NO or character which shows the ASCII value after subtraction
7. STOP
DECRYPTION ALGORITHM
For method 1.
1. Receive the string to be decrypts
2. Calculate the ASCII value of each character or symbol in string
3. Calculate ASCII value of 1
4. Add ASCII value of 1 in each character or symbol in the string
5. Put the NO or character which shows the ASCII value after addition
6. STOP
ENCRYPTION ALGORITHM
For method 2
1.START
2.Fetch the string to be encrypts
3.Calculate the ASCII value of each character in the string
4.Calculate the binary equivalent of ASCII value
5.Take a key “P” & calculate the ASCII value of “P”
6.Calculate the binary equivalent of ASCII value of “P”
7.Perform XOR operation between each character in the input string to the binary equivalent of “P” 8.Calculate ASCII value
after XOR operation

9.Note the NO or character which shows the resultant
ASCII value
10.STOP
DECRYPTION ALGORITHM
For method 2.
1. Receive the string to be decrypts
2. Calculate the ASCII value and corresponding binary equivalent of each character or symbol in string
3. Calculate the ASCII value & corresponding binary equivalent of “P”
4. Perform XOR operation between each character or NO in string to the binary equivalent of “P”
5. Calculate the ASCII value of binary equivalent after XOR operation
6. Note the NO or character which shows the resultant ASCII value
7. STOP.
Example to demonstrate the Encryption:
Break up of h e l l o
„hello‟ in
char
ASCII 104 101 108 108 111
values
ASCII 49 49 49 49 49
value of 1
Subtracting 55 52 59 59 62
Encrypted 7 4 ; ; >
data
Decryption:
Break up 7 4 ; ; >
of „74;;>‟
ASCII 55 52 59 59 62
value
ASCII 49 49 49 49 49
value of 1
Adding 104 101 108 108 111
Decrypted h e l l o
data

RESULT
TRANSMITTED DATA
RECEIVED DATA
CONCLUSION
Data encryption and decryption systems are used to improve information security to secure data that, thereby providing
enhanced level of assurance such that the data that are encrypted cannot be viewed by unauthorized receivers in the event
of theft or loss.
REFERENCES
[1]Ankit Dhamija, Research Scholar- A Novel Cryptographic and Steganographic Approch for Secure Cloud for Data
Migration, IEEE paper, Amity University, April 2016.
[2] Dain Rachmawati, Super-Encryption Implementation Using Monoalphabetic algorithm and XOR Algorithm for Data
Security, Journal of Physics, 2018.
[3] A.VIjayan. et. Int. Journal of Engineering Research and applications ASCII Value Based Encryption System, April 2016.
[4] International Journal of Advanced Research in Computer and Communication Engineering Vol. 2, Issue 8, August 2013

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