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Ever increasing need of electricity has paved the need for Smart Grids. Smart Meters, digitalized networks and fault tolerant systems are the basic infrastructure which supports Smart Grid. Security in Smart Grid has become a major concern in the present scenario. In this paper we have proposed security architecture at the last mile distribution in Home Area Networks. A Secure communication architecture has been modeled which focuses on secure data transmission between the Smart Meters at home and Central Gateway at the utility centre. Hybrid Encryption algorithms and Digital Signature has been used to provide data integrity. The strength of the model has been verified with the help of an attacker and the model is found to resist attacks. The Encryption time and Decryption time of the cyptostack is lower when compared with other encryption algorithms.

Smart grid is a paradigm shift from the traditional Power grid which promises to make the electric grid both energy efficient and Fault tolerant. Trade-off between Energy savings and Security is a critical issue in Smart grid architecture. Smart grid architecture requires a high level secure data exchanges between sensors like Phasor Measurement Units and Advanced Metering Infrastructures like Smart Meters. In this study a Secure Smart grid Architecture model is proposed for the Smart grid network. Initially DamgardJurik encryption algorithm is applied on the data from the Phasor Measurement Units and a digital signature is then attached to the encrypted text to provide further authentication. The digitally signed data is collected in Data centre where it is decrypted. The proposed architecture has been implemented in both software and hardware. The effectiveness of the system is verified by introducing an intruder in hardware implementation.