This document proposes a secure and distributed data discovery and dissemination protocol for wireless sensor networks called DiDrip. Existing protocols have drawbacks in that they use a centralized approach where only the base station can distribute data, and they were not designed with security in mind. DiDrip allows multiple network users to directly disseminate data to sensor nodes with different privileges. It consists of four phases to securely distribute data in a distributed manner: system initialization, user joining, packet preprocessing, and packet verification. The proposed system provides advantages over centralized approaches by allowing direct data dissemination to nodes, increasing security, and improving packet delivery ratio.

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SECURE AND DISTRIBUTED DATA DISCOVERY AND
DISSEMINATION IN WIRELESS SENSOR NETWORKS
ABSTRACT:
A data discovery and dissemination protocol for wireless sensor networks (WSNs) is responsible
for updating configuration parameters of, and distributing management commands to, the sensor
nodes. All existing data discovery and dissemination protocols suffer from two drawbacks. First,
they are based on the centralized approach; only the base station can distribute data items. Such
an approach is not suitable for emergent multi-owner-multi-user WSNs. Second, those protocols
were not designed with security in mind and hence adversaries can easily launch attacks to harm
the network. This paper proposes the first secure and distributed data discovery and
dissemination protocol named Did rip. It allows the network owners to authorize multiple
network users with different privileges to simultaneously and directly disseminate data items to
the sensor nodes. Moreover, as demonstrated by our theoretical analysis, it addresses a number
of possible security vulnerabilities that we have identified. Extensive security analysis show did
rip is provably secure. We also implement Did rip in an experimental network of resource-
limited sensor nodes to show its high efficiency in practice.

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EXISTING SYSTEM:
• More importantly, all existing data discovery and dissemination protocols employ the
centralized approach, data items can only be disseminated by the base station.
• Unfortunately, this approach suffers from the single point of failure as dissemination is
impossible when the base station is not functioning or when the connection between the
base station and a node is broken.
• In addition, the centralized approach is inefficient, non-scalable, and vulnerable to
security attacks that can be launched anywhere along the communication path.
DISADVANTAGES OF EXISTING SYSTEM:
• Centralized approach
• Existing method is in-efficient
• Vulnerable to security attacks
PROPOSED SYSTEM:
• In this project, we propose secure and data discovery and dissemination protocol
(DiDrip). DiDrip consists of four phases, system initialization, user joining, and packet
preprocessing and packet verification.

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• For our basic protocol, in system initialization phase, the network owner creates its public
and private keys, and then loads the public parameters on each node before the network
deployment.
• In the user joining phase, a user gets the dissemination privilege through registering to
the network owner.
• In packet preprocessing phase, if a user enters the network and wants to disseminate
some data items, he/she will need to construct the data dissemination packets and then
send them to the nodes.
• In the packet verification phase, a node verifies each received packet. If the result is
positive, it updates the data according to the received packet.
ADVANTAGES OF PROPOSED SYSTEM:
• User can send the data directly to the sensor nodes without using the base station
• Provide more security for data
• Increase packet delivery ratio

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SYSTEM ARCHITECTURE:
BLOCK DIAGRAM:

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SYSTEM REQUIREMENTS:
HARDWARE REQUIREMENTS:
 System : Pentium IV 2.4 GHz.
 Hard Disk : 40 GB.
 Floppy Drive : 1.44 Mb.
 Monitor : 15 VGA Colour.
 Mouse : Logitech.
 Ram : 512 Mb.
SOFTWARE REQUIREMENTS:
 Operating system : Windows XP/7/LINUX.
 Implementation : NS2
 NS2 Version : NS2.2.28
 Front End : OTCL (Object Oriented Tool Command Language)
 Tool : Cygwin (To simulate in Windows OS)
REFERENCE:
Daojing He, Member, IEEE, Sammy Chan, Member, IEEE, Mohsen Guizani, Fellow, IEEE,
Haomiao Yang, Member, IEEE, and Boyang Zhou, “Secure and Distributed Data Discovery and
Dissemination in Wireless Sensor Networks”, IEEE TRANSACTIONS ON PARALLEL AND
DISTRIBUTED SYSTEMS, VOL. 26, NO. 4, APRIL 2015.