Multicast authentication of synchrophasor data is challenging due to the design requirements of Smart Grid monitoring systems such as low security overhead, tolerance of lossy networks, time-criticality and high data rates. In this work, we propose inf -TESLA, Infinite Timed Efficient Stream Loss-tolerant Authentication, a multicast delayed authentication protocol for communication links used to stream synchrophasor data for wide area control of electric power networks. Our approach is based on the authentication protocol TESLA but is augmented to accommodate high frequency transmissions of unbounded length. inf TESLA protocol utilizes the Dual Offset Key Chains mechanism to reduce authentication delay and computational cost associated with key chain commitment. We provide a description of the mechanism using two different modes for disclosing keys and demonstrate its security against a man-in-the-middle attack attempt. We compare our approach against the TESLA protocol in a 2-day simulation scenario, showing a reduction of 15.82% and 47.29% in computational cost, sender and receiver respectively, and a cumulative reduction in the communication overhead.

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Energy meters have become smart and functionally powerful over time. Still many concerns about the correctness of their behavior are raised by society and the effort involved on new smart meters type approval are growing huge. Aiming at establishing trust on the smart meter, this paper proposes a consumption authenticator which can be read from the meter's display and verifiable by the user. This authenticator is generated inside a secure device, placed on the metering module, using ECPVS signature scheme providing partial message recovery. Since our approach considers different Time-Of-Use scenarios, a composing technique for the authenticator's embedded message is presented. Our concerns are the necessary data for validating Time-Of-Use rates measurement values and the final size of the message.