Authentication Mechanisms For Signature Based Cryptography By Using Hierarchical Scheme.

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International Journal of Modern Trends in Engineering
and Research
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@IJMTER-2014, All rights Reserved 127
e-ISSN: 2349-9745
p-ISSN: 2393-8161
Authentication Mechanisms For Signature Based Cryptography By
Using Hierarchical Scheme.
K.K.Priya1
, M.Mailsamy2
and B.M.Brinda3.
1
Dept of IT, Vivekanandha College of Engineering for Women
2
3
Abstract— In this paper the signature of a person is taken as input which is encrypted using
hierarchical visual cryptography. By using HVC the input signature will be divided into four shares.
From that any three are taken to generate key share. Another fragmentation should handover to the
authenticated server. The authenticated server should maintain the generated key and fourth
fragmentation. Only the authorized user can be accessed. If the receiver identifies the fourth
fragmentation and decrypt they got message by using HVC. It is insecure process because anybody
can hack the decrypted message easily. For the secure process the authenticated server generate a
password while transferring a message. The authenticated person can only able to got that message.
The authenticated server checks whether the person should be authorized user or not, while starting
their conversation. It provides more security and challenged for the hackers.
Keywords- Hierarchical visual cryptography, Secret sharing, Authentication server, Fragmentation,
Security analysis.
I. INTRODUCTION
Network is a group of two or more computer systems linked together. It can interconnect
with other networks and contain Sub networks. Computer Network is a telecommunications that
allows computer to exchange data. The computing device pass data to each other along data
connections or network lines between nodes are established using either cable media or wireless
media. The best known computer network is the Internet.
Network Security concerned with protection of data from unauthorized access. In a typical
network environment there are three aspects of information of security such as, Security Attacks,
Security Mechanisms, and Security Services. Security attacks: Actions which compromise the
security of information. Security Mechanisms: It is a method to detect, prevent, or recover from
security attacks. Security services: A service which employs one or more security mechanisms to
enhance the security of the network. The security mechanisms contain Confidentiality,
Authentication, Integrity, No Repudiation, Access control, Availability. A host can be a server, a
workstation, or a device such as a router. Any system or device connected to a network is called
Host.
The concept of hierarchical visual cryptography is based upon visual cryptography. Visual
cryptography encrypts the informative image into two shares so that one cannot reveal the original
information in absence of other. To decrypt the secret, both shares are required to be super imposed
with each other. The original secret is divided into exactly two shares. Hierarchical visual
cryptography can encrypts the secret in the form of levels. Initially the secret is encrypted to generate
two shares. Later these two shares are encrypted independently generating four resultant shares.
Finally any three shares are collected to generate the key share. The server has special software

International Journal of Modern Trends in Engineering and Research (IJMTER)
Volume 01, Issue 05, [November - 2014] e-ISSN: 2349-9745, p-ISSN: 2393-8161
called host refers to any computers or device that is connected to a network and sends or receives
information on that network. A host can be a server, a workstation, or a device such as a router. Any
system or device connected to a network is called Host. The host is used for sending and receiving
the nodes by the authenticated server.
HVC mainly used to secure the data from unauthorized users in data security. It secures the
network as well as protecting and overseeing operations being done in HVC. It is a series of points or
nodes interconnected by communication paths. Many authentication systems are proposed which is
based on fingerprint and Iris. These authentication mechanisms are mainly used in Army and
banking, etc for the human identification and security. The signature is a special pattern provided for
human authentication at the security level. It is great importance and more reliable for the stated
mechanism in HVC. By using HVC it provides more security and challenged for hackers. The key
share generated is having random techniques.
II. RELATED WORK
The concept of Secure Iris Authentication is done by visual cryptography. The system uses
the human eye iris for authenticate purposes. Before storing the iris in central database, it is
encrypted using visual cryptography scheme. Visual cryptography provides extra layer of
authentication in the system. In the system enrolled iris template is divided into two shares using
visual cryptography, one is kept in the database and other is placed on the user ID card. Iris template
is secured by using only one share by the database in which no information can be retrieved for the
enrolled eye image. Thus the unauthorized user is prevented [1]. By using the intelligent system the
security of the authentication is secured. In the visual cryptography the secret sharing is done by
dividing the secret information into number of parts. Since it shares individual information, it is
unable to reflect secrecy of the data. Hence in future the security in multiple levels can be improved.
[2]. Diffie-Hellman key agreement protocol and visual cryptography scheme were merged for the
discovery of the new cryptographic scheme. The newly implemented scheme verifies the shadows
which are authentic before reconstructing the secret image. Then it was found to be secured than
plane visual cryptographic scheme because it has low computations in authentication [3].
Yi Hui Chen and Pei Yu Lin proposed a novel secret sharing scheme using low computations
for authentication. The advantage in the scheme is the pixel expansion which has 1:1 ratio. The
secret sharing can be modified without any loss of information. Since it cannot authenticated with the
half secret key which is infeasible for signature based authentication. By using the Boolean
operations the secret key can be encrypted [4]. Image Captcha Based Authentication Using Visual
Cryptography Preserve the privacy of image by degenerating the original image by using Blowfish
algorithm, Splitting & Rotating algorithm. It attack globally and capture and store the user’s
confidential information. The image Captcha is readable by human users alone and not by machine
users [5].
The hierarchical visual cryptography provides expansion less shared key. The encrypted
secret key in various levels is done by designing and the implementation of hierarchical visual
cryptography. The encryption in turn is expansion less by using Greying Effect (GE). The expansion
of secret key takes place after encryption, which reflects some GE. The GE is completely removed
while revealing the secret removal of GE [6]. The efficient delegation of key generation and
revocation functionalities is used in Identity-Based Encryption (IBE). The efficient solution of the
revocation or delegation of key generation is done by using IBE. When a secret key is corrupted by
hacking the period of a contract is expires. Thus it reduces the excessive workload for a single key
generation authority [7]. Attribute-Based Encryption (ABE) is the hierarchical access structure. The
public keys allow encrypting an unbounded number of users by using ABE. The key storage is
significantly more efficient than all solutions. Encrypt key size without compromising on other
critical parameters [8].

III. EXISTING WORK
HVC divides input signature into four resultant shares. Among four shares, any three are
taken to generate key share. Remaining share is handed over to the user and the key share is placed
on authentication system. If the receiver identifies the fourth fragmentation and decrypt they got
message by using HCV. It is insecure process because anybody can hack the decrypted message
easily. The Signature is the most common authentic entity from the user side which has been used
earlier in various confidential purposes. For improving security of authentication system, the
signature is required to be enrolled and verified.
It Change the pixel distribution of the image when unauthorized access is going on by using
Fool-Proof Lock-Key, Sub pixel Keys can be duplicated easily even without using the original key.
Every lock-key pair has one associated unique image. It cannot be duplicated. Automatically
preserve the privacy of captcha by using Anti-phishing methodology. The Attackers use such
information for monetary benefits for secure and prevent the phishing attacks.. When a secret key
is corrupted by hacking or the period of a contract expires. Reduce excessive workload for a single
key generation authority. The public key allows encrypting an unbounded number of users by using
Attribute-Based Encryption. Key storage is significantly more efficient than all solutions. Encrypt
key size without compromising on other critical parameters.
The simple share is the part of database in the system. As the database of the entire authentication
system includes the scrambled form of the share, there exist least possibility of various attacks like
dictionary attack and bruit force attack. During authentication, employee should insert the smart card
in the card reader mounted in the entrance card. If the card is stolen in that case it will not be of any
use to the unauthorized user but authorized user will be issued a new card. It generate the key share
randomly techniques.
A. Methodology for Hierarchical Visual Cryptography
Hierarchical visual cryptography is defined on basis of visual cryptography. Simple visual
cryptography divides original secret in two parts. Each part is known as share. To reconstruct the
secret, both shares are stacked together. Hierarchical visual cryptography also encrypts the secret
information in two shares at the first stage. Later, these two shares are encrypted individually to
generate subsequent shares.
The second level of hierarchy in HVC is found the four resultant shares Out of these four
shares, any three shares are taken to generate the key share. This stage is identified as third level of
HVC. Finally, HVC scheme gives two resultant shares out of which one is handed over to the user
for authentication and another share is along with database. Original secret is an input to the system.
Two shares are generated out of expansion less visual cryptography module. These two shares are
independently encrypted. Key share generator module is responsible for generation of key share. Key
share is combination of first three shares taken from previous level of hierarchy. Here A indicates
key share and B indicates remaining share. Percentage of black and white pixels remains constant for
different category of secrets like images, handwritten text and textual passwords. It has been
analyzed that the concentration of white pixels decreases drastically in first level of hierarchical
visual cryptography. This concentration remains steady for second level and later increases at the end
of hierarchy. Key share reflects high concentration of black pixels. The revealed secret represents
high concentration of white pixels.
IV. PROPOSED WORK

Hierarchical visual cryptography increases the security by encrypting the signature. The
card reader reads the key share from card and superimposes over the corresponding simple share
available in the database. For verification of an employee, revealed signature is matched with
enrollment number. In this authentication system, unauthorized user can not authenticate. It encrypts
the input secret in hierarchical manner hence more secrecy is maintained in the shares. Shares
generated out of this scheme are expansion less.
The Proposed authentication system is the replacement for password based authentication. In
traditional password based authentication mechanism, user has to remember the password and purely
influenced by dictionary attack. The authenticated person can only able to got that message. Here,
signature is unique pattern presented by user and two way authentication is taking place the user
authenticate to the system and system authenticate to user.
1. Cryptographic Key Assumption
Cloud Computing moves the application software and databases to the large data centers,
where the management of the data and services may not be fully trustworthy. This unique attribute,
however, poses many new security challenges which have not been well understood. In this article,
we focus on cloud data storage security, which has always been an important aspect of quality of
service. To ensure the correctness of users’ data in the cloud, we propose an effective and flexible
distributed scheme with two salient features, opposing to its predecessors. These techniques, e.g.,
RSA provide a secure solution but are not practical for secure EHR storage due to the requirement
for an expensive public-key infrastructure (PKI) to be maintained for distributing and managing
public keys and digital certificates for all healthcare providers.
2. Attribute Key Assumption
Group key distribution schemes has recently received a lot of attention from the researchers, as
a method enabling large and dynamic groups of users to establish group keys over unreliable
network for secure multicast communication Group Manager transmits some broadcast message, in
order to provide a common key to each member of the group.
Every user, belonging to the group, computes the group key using the message and some
private information. The main property of the scheme is that, if some broadcast message gets lost,
then users are still capable of recovering the group key for that session by using the message they
received at the beginning of a previous session and the message they will receive at the beginning of
a subsequent one, without requesting additional transmission from the Group Manager. This
approach decreases the workload on the Group Manager and reduces network traffic as well as the
risk of user exposure through traffic analysis.
3. Key Distribution
Common group key is frequently updated to ensure secure multicast communication. It is valid
only throughout one session. Group membership can change between consecutive sessions. It can
vary over time, depending on security policy, group membership changes and nodes behavior.
Session key changes have to be performed, with some predefined minimum frequency to protect
the system from cryptanalysis attacks.
4. Key Issuing Secured Access
The data-storing center is involved in the user key issuing protocol. In the protocol, a user is
required to contact the two parties before getting a set of keys. The secret key is generated through

the secure the data storing center the proposed scheme is to encrypt, and decrypt algorithm
definitions.
5. Security Analysis
Security architecture satisfies the security requirements for authentication, data integrity, and
confidentiality, which follows directly from the employment of the standard cryptographic
primitives, namely digital signature, message authentication code, and encryption, in our system. The
fraud can be repudiated only if the client can provide a different representation he knows of from the
trusted authority.
VII. CONCLUSION
In this proposed modules the signature of a person is taken as input which is encrypted using
hierarchical visual cryptography. By using HVC the input signature will be divided into four shares.
From that any three are taken to generate key share. Another fragmentation should handover to the
authenticated server. The authenticated server should maintain the generated key and fourth
fragmentation. If the receiver identifies the fourth fragmentation and decrypt they got message by
using HVC. It is insecure process because anybody can hack the decrypted message easily .For the
secured process the authenticated server generate a password while transferring a message. The
authenticated person can only able to got that message. The authenticated server checks whether the
person should be authorized user or not, while starting their conversation. It provides more security
and challenged for the hackers.
REFERENCES
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[12] Pallavi Vijay Chavan, Dr. Mohammad Atique and Dr. Latesh Malik” Design and Implementation of Hierarchical
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Authentication Mechanisms For Signature Based Cryptography By Using Hierarchical Scheme.

Authentication Mechanisms For Signature Based Cryptography By Using Hierarchical Scheme.

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