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in internet security it is important to ensure the authentication and digital certificates of network for providing most secure transmission on network. in order to achieve the privacy throughout the network we propose a public key infrastructure based environment which provides certificate authority, certificate revocation process. for these multi certificates pki (mcpki) which supports user self-services, such as certificates spontaneous substitution as well as self-reissue after self-revocation. we concentrate on both rsa and digital signature for verifying the nodes trustworthiness. our simulation results shows that the proposed rsa cryptographic technique provides high level secure transmission than existing system. the use of pkc in sensor networks has been usually considered as nearly impossible. for achieving secure and efficient network, we propose our own energy efficient and scalable pki for wsns. this is accomplished by taking advantage of heterogeneous sensor networks and elliptic curve cryptography. the goal of pki is to protect and distribute information that is needed in a widely distributed environment. it integrates the functions of digital certificate, pkc and certificate authorities. our proposed pki is analyzed in terms of security, energy efficiency, and scalability.
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