A Modified Pair Wise Key Distribution Schemes and There Effect On Network Performances

Dheeraj Patel et al. Int. Journal of Engineering Research and Applications www.ijera.com
ISSN: 2248-9622, Vol. 5, Issue 8, (Part - 2) August 2015, pp.24-29
www.ijera.com 24 | P a g e
A Modified Pair Wise Key Distribution Schemes and There Effect
On Network Performances
Dheeraj Patel1
, Purushottam kumar singh2
, Deepak sukheja3
(PG Student, Dep’t. Of CSE, Oriental University, Indore)
(Assoc. Professor, Dep’t. Of CSE, Oriental University, Indore)
(Head of the, Dep’t. Of CSE, Oriental University, Indore)
ABSTRACT
Key distribution schemes has always played a pivotal role in the security of wireless sensor networks. In this
research work we focus mainly on the security aspect of WSN . We have developed a modified key distribution
scheme which uses the concepts of post as well as pre distribution scheme and thus he proved to be a better
alternative then the rest of two schemes. Simulation study has been carried out using matlab. The effort turned
out to be fruitful s our modified scheme showed less dead nodes per round of data transfer as compared to post
deployment scheme.
Keywords: Security Key establishment, Mobile sensor networks, Key prioritization, Post-deployment
knowledge.
I. INTRODUCTION
Distributed sensor networks have received a lot
of attention recently due to its wide applications in
military as well as civilian operations. Example
applications include target tracking, scientiﬁc
exploration, and data acquisition in hazardous
environments. The sensor nodes are typically small,
low-cost, battery powered, and highly resource
constrained. They usually communicate with each
other through wireless links .Security services such
as authentication and key management are critical to
secure the communication between sensor nodes in
hostile environments. As one of the most
fundamental security services, pair wise key
establishment enables the sensor nodes to
communicate securely with each other using
cryptographic techniques. However, due to the
resource constraints on sensor nodes, it is not feasible
for them to use traditional pair wise key
establishment techniques such as public key
cryptography and key distribution center (KDC).
Instead of the above two techniques, sensor nodes
may establish keys between each other through key
pre distribution, where keying materials are pre
distributed to sensor nodes before deployment. As
two extreme cases, one may setup a global key
among the network so that two sensor nodes can
establish a key based on this global key, or assign
each sensor node a unique random key with each of
the other nodes. However, the former is vulnerable to
the compromise of a single node, and the latter
introduces huge storage overhead on sensor nodes.
Eschenauer and Gligor proposed a probabilistic key
pre distribution scheme recently for pair wise key
establishment [Eschenauer and Gligor 2002]. The
main idea is to let each sensor node randomly pick a
set of keys from a key pool before the deployment so
that any two sensor nodes have a certain probability
to share at least one common key. Chan et al. further
extended this idea and developed two key pre
distribution techniques: a q –composite key pre
distribution scheme and a random pair wise keys
scheme [Chan et al. 2003]. The q -composite key pre
distribution also uses a key pool but requires two
nodes compute a pair wise key from at least q pre
distributed keys that they share. The random pair
wise keys scheme randomly picks pairs of sensor
nodes and assigns each pair a unique random key.
Both schemes improve the security over the basic
probabilistic key pre distribution scheme. However,
the pair wise key establishment problem is still not
fully solved. For the basic probabilistic and the q -
composite key pre distribution schemes, as the
number of compromised nodes increases, the fraction
of affected pair wise keys increases quickly. As a
result, a small number of compromised nodes may
affect a large fraction of pair wise keys. Though the
random pair wise keys scheme does not suffer from
the above security problem, given a memory
constraint, the network size is strictly limited by the
desired probability that two sensor nodes share a pair
wise key, the memory available for keys on sensor
nodes, and the number of neighbor nodes that a
sensor node can communicate with.
In this paper, we develop a number of key pre
distribution techniques to deal with the above
problems. We ﬁrst develop a general framework for
pair wise key establishment based on the polynomial-
based key pre distribution protocol in [Blundo et al.
RESEARCH ARTICLE OPEN ACCESS

1993] and the probabilistic key distribution in
[Eschenauer and Gligor 2002; Chan et al. 2003]. This
framework is called polynomial pool-based key pre
distribution, which uses a polynomial pool instead of
a key pool in [Eschenauer and Gligor 2002; Chan et
al. 2003]. The secrets on each sensor node are
generated from a subset of polynomials in the pool. If
two sensor nodes have the secrets generated from the
same polynomial, they can establish a pair wise key
based on the polynomial-based key pre distribution
scheme. All the previous schemes in [Blundo et al.
1993; Eschenauer and Gligor 2002; Chan et al. 2003]
can be considered as special instances in this
framework.
By instantiating the components in this
framework, we further develop two novel pair-wise
key pre distribution schemes: a random subset
assignment scheme and a hypercube-based scheme.
The random subset assignment scheme assigns each
sensor node the secrets generated from a random
subset of polynomials in the polynomial pool. The
hypercube-based scheme arranges polynomials in a
hypercube space, assigns each sensor node to a
unique coordinate in the space, and gives the node
the secrets generated from the polynomials related to
the corresponding coordinate. Based on this
hypercube, each sensor node can then identify
whether it can directly establish a pair wise key with
another node, and if not, what intermediate nodes it
can contact to indirectly establish the pair wise key.
Our analysis indicates that our new schemes have
some nice features compared with the previous
methods. In particular, when the fraction of
compromised secure links is less than 60%, given the
same storage constraint, the random subset
assignment scheme provides a significantly higher
probability of establishing secure communication
between non-compromised nodes than the previous
methods. Moreover, unless the number of com-
promised nodes sharing a common polynomial
exceeds a threshold, compromise of sensor nodes
does not lead to the disclosure of keys established
between non-compromised nodes using this
polynomial.
Similarly, the hypercube-based scheme also has
a number of attractive properties. First, it guarantees
that any two nodes can establish a pair wise key
when there are no compromised nodes, provided that
the sensor nodes can communicate with each other.
Second, it is resilient to node compromise. Even if
some sensor nodes are compromised, there is stilla
high probability to re-establish a pair wise key
between non-compromised nodes. Third, a sensor
node can directly determine whether it can establish a
pair wise key with another node and how to compute
the pair wise key if it can. As a result, there is no
communication overhead during the discovery of
directly shared keys. Evaluation of polynomials is
essential to the proposed schemes, since it affects the
performance of computing a pair wise key. To reduce
the computation at sensor nodes, we provide an
optimization technique for polynomial evaluation.
The basic idea is to compute multiple pieces of key
fragments over some special finite fields such as F28
+ 1 and F216 + 1 and concatenate these fragments
into a regular key. A nice property provided by such
finite fields is that no division is necessary for
modular multiplication. As a result, evaluation of
polynomials can be performed efficiently on low cost
processors on sensor nodes that do not have division
instructions. Our analysis indicates that such a
method only slightly decreases the uncertainty of the
keys.
II. IMPLEMENTATION OF KEY PRE
DISTRIBUTION SCHEME
The basic algorithms for key pre distribution
scheme for matrix based system can be written as
below:-
1. Choose ‘N’ independent key seeds designated
as s1 , s2, s3, …..sN.
2. Let their id’s be id1,id2,id3,id4,id5,idN
3. Consider a matrix h as per [1].
4. Create a lambda x lambda matrix as per [1].
5. Calculate matrix A as per [1].
6. Generate keys and broadcast keys to each node.
7. Each node will then transmit packets to BS via
other nodes according to matrix A and with the
help of keys stored.
8. Because keys are distributed and broadcasted to
each nodes in advance this scheme is called as
key pre distribution.
9. This scheme has been implemented for 100
nodes and for 100 rounds of data packets and the
results are as below :-
Fig. 5.1 Average energy spent per round for key pre
distribution scheme

Fig 5.2 No. of dead nodes per round for key pre
distribution scheme
III. IMPLEMENTATION OF POST
DEPLOYMENT ANALYSIS
In this method as per given in [2] basic steps are
as below :-
1. ‘m’ key units are generated by the system in a set
of ‘M’ , such that each node can store a
maximum of ‘m’ key units.
2. A unique id is assigned to each node.
3. Each ‘m’ key units are randomly distributed to
each node.
4. Then nodes are deployed physically and their
locations are determined using gps and this
information is called as their unique location.
5. Prior to distributing keys the locations are also
determined randomly and associated with each
node.
6. Then each node will determine the distance
between other nodes and then the key will be
shared as per [2].
7. Because the keys are not broadcasted as shown
in [1] this scheme is referred to a post
deployment analysis.
The results for this algorithm in terms of energy
and dead nodes per round are given as below:-
Fig. 5.3 Average energy spent per round for post
deployment scheme
Fig 5.4 No. of dead nodes per round for post
deployment scheme
IV. A COMBINATIONAL APPROACH
In our work we have combined the benefits of
the above two schemes and then simulated the entire
setup for 100-500 rounds of data transfer. The basic
steps involved in our approach are as follows:-
1. We have assumed that the position of nodes are
not determined in advance contrary to pre
distribution scheme and thus the locations of the
nodes are determined via gps but this time the
information is relayed to base station.
2. The base station then depending on the location
of each node will broadcast the key matrix to
each node as per in [1].
3. This distributed common matrix will be used by
all the nodes to generate further key for
communication.
4. Each node then will determine the distance
between other nodes as per [2].
5. This information is then used for effective
communication i.e the node will not broadcast
the information, rather the information will be
relayed form one node to another as in
hierarchical wireless sensor network.
6. The LEACH clustering algorithm has been
deployed for further data transfer.
7. Because the information is relayed form one
node to another the overall dead node occurrence
is significantly reduced and hence the data
transfer gets complete without overloading the
nodes.
Various simulation results for the said scheme
are as given below:-

Fig 5.5 Simulations results for modified algorithms
for 100 rounds
for 200 rounds
for 300 rounds
for 400 rounds

for 500 rounds
V. CONCLUSION
In this research work, we developed a general
framework for polynomial pool-based pair wise key
pre distribution in sensor networks based on the basic
polynomial-based key pre distribution in [1]. This
framework allows study of multiple instantiations of
possible pair wise key establishment schemes. Based
on this framework, we developed two specific key
pre distribution schemes: the random subset
assignment scheme and the hypercube-based key pre
distribution scheme. Our analysis of these schemes
indicate that both schemes have significant
advantages over the existing approaches. The
implementation and experimental results also
demonstrate the practicality and efficiency in the
current generation of sensor networks. Several
research directions are worth investigating. First, we
observe sensor node have low mobility in many
applications. Thus, it may be desirable to develop
location-sensitive key pre distribution techniques to
improve the probability for neighbor nodes to share
common keys and at the same reduce the threat of
compromised nodes. Second, it is critical to detect
and/or revoke compromised nodes from an
operational sensor network.
It has been shown in the result analysis that the post
deployment analysis scheme given in [2] has major
drawbacks in terms of no of dead nodes per round of
data transfer , our results are better then both the
approaches but several mathematical models are still
need to be made , thus this work has to completed in
the future to avoid any dis ambiguousness in the
research literature.

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A Modified Pair Wise Key Distribution Schemes and There Effect On Network Performances

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