Long-Term-Evolution (LTE) based Device-to-Device (D2D) communications in future generation networks are envisaged to become the basis for deployment of various applications and services in Smart Grids (SGs). However related privacy and security aspects are also under serious consideration espe-cially when dealing with large-scale deployment of services and applications related D2D groups. Current related algorithms cannot be applied directly to this new paradigm shift (i.e D2D communication and group formations). Using the IoT as the pillar communication subsystem for SGs, the service providers can deploy several applications and services some of which may include the acquisition and storage of personal infor-mation of individual SG users. However, the challenge will al-ways be in the strict preservation of privacy and security of their personal data and thus a necessity in eliminating such concerns. In this paper we introduce a privacy and security scheme that utilizes separate keys for group discovery / authentication and billing data communications exchange phases respectively. In order to enhance its resilience, the keys are distributed in a manner by a network of distributed key gen-erating centers (KDCs). Both data ciphering and deciphering algorithms follow the Diffie-Hellman key establishment protocol. Overall the smart meters (SMs) in a targeted SG billing section mutually authenticate as a group prior to da-ta/information exchange. In that way the scheme overall maintains low latencies because of the fewer authentication associated messages exchanges.

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