ASCII Value Based Encryption System (AVB)

A.Vijayan.et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN: 2248-9622, Vol. 6, Issue 4, (Part - 5) April 2016, pp.08-11
www.ijera.com 8|P a g e
ASCII Value Based Encryption System (AVB)
A.Vijayan1
, T.Gobinath2
,M.Saravanakarthikeyan3
1
(Department Of Information Technology, Chettinad College Of Engineering & Technology,Karur,)
2,3
(Assistant Professor Department Of Information Technology, Chettinad College Of Engineering &
Technology,Karur)
ABSTRACT
Encryption and decryption are considered to be the guard for data in this technological world. To provide some
kind of security, this paper proposes a new algorithm called AVB algorithm which is used to enhance the
security of the data. This algorithm mainly focuses on ASCII value of data. ASCII value of the character is
encrypted using normal mathematical calculation for number of time on a particular character and converted to
numerical value. Then the cipher text is decrypted to get the original plain text. This algorithm is efficient in two
ways it difficult for the intruders to predict the data as each character follows different form of encryption based
on the key. And also it is simple, fast, and cost efficient while compared to ASCII value based text encryption
system by Udepal Singh and Upasna Garg
I. INTRODUCTION
In technological world everything is easy
both attack and prevention. Every technology in
this High-fi world has vulnerability.Attacks from
the vulnerability can be minimized by drum card
“cryptography”. In cryptography Lots of methods
have been proposed by various cryptographers to
minimize the attack of intruder’s. Cryptography is
the science of using maths to encrypt and decrypt
data. Cryptography enables you to store secure
information or to be transmitted across vulnerable
network (like the Internet) so that it cannot be read
by anyone except the intended recipient .While
cryptography is the science of securing
data, cryptanalysis is the science of applying and
breaking secure communication. Classical
cryptanalysis involves an interesting combination
of analytical reasoning, application of mathematical
tools, pattern finding, patience, determination, and
luck.Level of security depends upon the algorithm
that has been used to produce cipher text, number
of round doesn’t matter where the logic of
algorithm matter’s. In order to fulfil the
requirements, many encryption schemes have been
proposed and analysed as possible solution
systems.
In this paper, a new cryptographic
algorithm is proposed, which follows a different
method using the ASCII value. This new method
provides security to data in a lower cost.
II. RELATED WORK
Udepal Singh, Upasna Gargencrypted the
data on the basis of Unicode values, in which the
security of data is increased [1].JGitanjali,
Dr.N.Jeyanthi, C.Ranichandra, M.Pounambal
proposed a newAlgorithm for encryption
Technique, UPMM algorithm, which is
applied on ASCII value of data. ASCII values are
encrypted using a key involving Palindrome
numbers and unique alphanumeric id, which is also
converted into ASCII value to provide
authentication over the network
[2].Dr.M.MohamedSathik, A. KalaiSelvi, proposed
data encryption anddecryption process using secret
sharing scheme, which is based on generating the
random polynomial and evaluates the mean value
of the polynomial’s coefficients. The mean value is
added with the ASCII value of the plain text to get
the cipher text [3].Prasant Sharma, Amit Kumar
Gupta analyzed the speed of RSA public key
cryptosystem to reduce the time taken for finding
factor for a large number [4].SubhranilSom,
DipanjanMitra, JhilomHaldarproposed an
algorithm in which A Key is created from the
input. Generating different randomized Matrices
forms the Key. The value of the generated is
manipulated with the individual ASCII values of
the plain text. After completion of this process all
the different resultant ASCII values will be further
converted into their corresponding binary values
[5].Dhavelvegad Husain Ullah khan NimishGhosh
proposed an algorithm in which length of the key is
calculated by adding any two random characters at
starting and ending of a text and Ascii value of
each character is calculated and shift operation is
performed. They also tried encrypting file in the
same manner[6].SatyajeetR.Shinge and Rahul Patil
Proposed an algorithm in which uses Ascii value of
the plain text to encrypt it, this system randomly
generates a key for user having equal to length of
the plain text. The randomly generated key is
converted to another key which is used for
RESEARCH ARTICLE OPEN ACCESS

decryption purpose[7].m.lavanyaR.vijaysai
proposed an idea which is based on Ascii value and
random number generator to achieve data security
and prevent unauthorized person from meddling
secret data [8].AnupamKumarBairagi proposed an
algorithm in which every character can be
represented as an ASCII value which is either even
or odd .depending upon this evenness or oddness,
the character is encrypted differently [9].
III. LITERATURE SURVEY
Cryptography is the art of writing or
solving codes. The main objective of cryptography
is to provide security to the data in this vulnerable
world. Cryptography mainly focuses upon
encryption and decryption. Cryptography
concentrates on confidentiality, integrity,
authentication, access control.
Encryption
Decryption
Encryption:
Encryption is the concept of altering or
modifying the original data (plain text) into some
meaningless or sometime meaningful data but
which is not same as compared to the plain text.
Encryption uses some logic to convert plain text to
cipher text. The logic can be done in two ways with
or without key.
Symmetric key
Asymmetric key
Symmetric key:
It is one of the method in encryption this
type of encryption uses same key on both sender
and receiver side to encrypt and decrypt data. The
length of the key and type of data which we use as
a key is strength of algorithm as well as security of
data.
Asymmetric key:It is one of the method in
encryption this type of encryption uses different
key on both sender and receiver side to encrypt and
decrypt data. In this method public and private key
is used in which if public key is used for encryption
then private key is used for decryption and vice
versa.
Decryption:
Decryption is the reverse process of
encryption, in which the cipher text is converted to
plain text using same method followed in
encryption.
IV. PROPOSED METHOD
[1] Encryption phase
In this algorithm the information to be
encrypted is fetched. The fetched data is stored in
an array of characters, the characters are converted
into their corresponding ASCII values. Square root
for the ASCII values are found for “N” times where
N is derived from Key string. The key which is
used to encrypt the information is encrypted. Key
string is stored in an array after taking ASCII value
for all the characters in the key string. Square root
for ASCII value of the key string is taken for
“N”times. Finally an array consist of floating point
numbers is the cipher text. This encryption phase
continues until all the characters are encrypted.
Then cipher text is sent to the receiver end
.
(II)Pseudo codefor Encryption:
The pseudo code for encryption phase is as follows
[2] Decryption phase
Decryption is the vice-versa of encryption
in which the cipher text is converted back to plain
text (original text).it uses the same methodology
followed in encryption. Decryption is critical phase
since authentication is must and also we have to
make sure that there is no changes in the data while
transmission. There are several methods followed
to meet the above mentioned criteria. Decryption in
this proposed algorithm is as follows,fetch the
cipher text which is in the form of floating point
numbers both the encrypted data and key and
square the cipher text for “N” times if only the key
string matches. As a result of squaring a whole
number is formed which is the ASCII value of the
character. The ASCII value is converted into
corresponding character based on the ASCII
values, which is the original data or plain text. The
algorithm for decryption is shown below.
Pseudo codefor Decryption:

The pseudo code for Decryption phase is as follows
V. RESULT
The proposed algorithm is implemented as
a project for encrypting and decrypting both files
and data. The result of encryption and decryption
is as follows.
[a] Encryption of text message:
There are several algorithms available to
provide security to the data. In this we are
demonstrating the proposed algorithm in practical
aspect. The snapshot shown below is the output of
this algorithm. The procedure to perform
encryption is as follows. To encrypt the text
message input the message/data in the Text Box
and then click encrypt button to perform encryption
and the result is displayed in the resultant text box.
:
[a] Encryption of file:
The proposed method is also implemented
for encrypting the files. Since file sharing and
uploading is most common means of
communication between two parties now a days. It
is used to provide security to files while uploading
and sharing via internet. The procedure to perform
this is, the user browses the file to be encrypted and
fetch the original file. The file is encrypted on
clicking the encrypt button and the encrypted file is
saved in a location and address is displayed to the
user.
[a] Decryption of text message:
As mentioned earlier decryption is the
reverse process of encryption. Demonstration of
decryption is as follows, to decrypt the text
message, just click in decrypt button and the cipher
text in text box is converted to plain text (original
text).
[b] Decryption of file:
Procedure to decrypt the file is, user
browses the file to be decrypted and fetch the
encrypted file. The file is decrypted on clicking the
decrypt button and the decrypted file is saved in a
location and address is displayed to the user.

VI. CONCLUSION
In this paper we proposed an algorithm to
encrypt and decrypt data using ASCII value further
no additional data is added so it is difficult to find
out the original data also in this algorithm the data
is encrypted after going through the several rounds.
It is difficult to predict since key string also
encrypted.
VII. FUTURE WORKS
With the proposal of this paper as a base
we are working on to implement this algorithm on
all file formats in future also we will implement
this algorithm in asymmetric key based encryption,
decryption system.
REFERENCES
Journal papers:
[1]. Udepal Singh, Upasna Garg ; An ASCII
value based text data encryption System in
International Journal of Scientific and
Research Publications, Volume 3, Issue
11, November 2013 1 ISSN 2250-3153.
[2]. SubhranilSom,
DipanjanMitra,JhilomHaldar; Session Key
Based Manipulated Iteration Encryption
Technique (SKBMIET),2008 International
Conference on Advanced Computer
Theory and Engineering.
[3]. Satyajeet R. Shinge, Rahul Patil, An
encryption algorithm Based on ASCII
value of data, international journal of
computer science and information
technologies,vol 5(6),2014,7232-7234
[4]. DhavalVegad Husain Ullah Khan,
character based encryption and decryption
using modulo arithmetic,international;
journal of science
technology&engineering|volume 1|issue
10|april 2015

ASCII Value Based Encryption System (AVB)

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