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When deploying wireless sensor networks (WSNs) in public environments it maybecome necessary to secure their data storage and transmission against possibleattacks such as node-compromise and eavesdropping. The nodes feature only smallcomputational and energy resources, thus requiring efficient algorithms. As asolution for this problem the TinyPEDS approach was proposed in [7], whichutilizes the Elliptic Curve ElGamal (EC-ElGamal) cryptosystem for additivehomomorphic encryption allowing concealed data aggregation. This work presentsan optimized implementation of EC-ElGamal on a MicaZ mote, which is a typicalsensor node platform with 8-bit processor for WSNs. Compared to the bestprevious result, our implementation is at least 44% faster for fixed-pointmultiplication. Because most parts of the algorithm are similar to standardElliptic Curve algorithms, the results may be reused in other realizations onconstrained devices as well.

Optimized Implementation of Elliptic Curve Based Additive Homomorphic Encryption for Wireless Sensor Networks