Although it is a deployed system, the data collection process of Smart Grids (SGs) is still a topic that needs consideration. The reason behind this is that Advanced Metering Infrastructure (AMI) applications used for collection can cause leakage of sensitive information about the users if data is sent as plaintext. In this paper, we propose a system that provides privacy with the Paillier cryptosystem and two-factor authentication with ECDSA and OpenSSL certificates. In order to test the system, an IEEE 802.11s-based SG AMI network testbed is constructed with Beaglebone Black boards that imitate the behavior of smart meters. The same network is also simulated in ns-3. Tests are done in two modes (hop-by-hop and end-to-end aggregation) and results are collected based on three metrics (packet delivery ratio, throughput, and completion time). The results showed that ns-3 simulation and testbed results are parallel and the proposed system can perform effectively. However, there are still many differences that need to be taken into account in deploying real systems.
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