Extracting Secret Key from Received Signal Strength (rss) Measurements in Wireless Networks

Evaluate the effectiveness of secret key extraction, for private communication between two wireless devices, from the received signal strength (RSS) variations on the wireless channel between the two devices. In a variety of environments, RSS may vary due to lack of variations in the wireless channel; the extracted bits have very low entropy making these bits unsuitable for a secret key, In significant movement environment, high entropy bits are obtained fairly quickly. Develop an environment adaptive secret key generation scheme that uses an adaptive lossy quantizer in conjunction with Cascadebased information reconciliation and privacy amplification. Our measurements show that our scheme, in comparison to the existing ones that we generate high entropy bits at a high bit rate. The secret key bit streams generated by Adaptive secret bit generation (ASBG) scheme. Finally, we evaluate secret key extraction in a multiple input multiple output (MIMO)-like sensor network testbed that we create using multiple TelosB sensor nodes. Our MIMO-like sensor environment produces prohibitively high bit mismatch, which we address using an iterative distillation stage that we add to the key extraction process. Ultimately, we show that the secret key generation rate is increased when multiple sensors are involved in the key extraction process. Keywords—Adaptive secret bit generation, Received signal strength, TelosB sensor node, Cryptography