本提案將利用資訊隱藏的技術，將原先應儲存於防竄改晶片上的挑戰值及回應值改存放於主計算平台中的亂數填充區塊。藉此減少防竄改晶片的儲存負擔，並同時增加亂數填充區塊的使用率。 ;Wireless sensor network (WSN) composed of base station and sensor nodes has been widely applied in our daily lives, such as healthcare monitoring systems. The advantages of sensor nodes are optimized implementation and cost-efficient. However, these sensors have limited resources in computation, memory capacity, and energy. For the reasons given above, these sensors become attractive target for various security risks. A compromised sensor node will result in fake data delivery or private data disclosure. Therefore, a security mechanism used for detecting the trustworthiness of a sensor node is urgently desired.
Remote attestation scheme, an effective protection mechanism, has been proposed for detecting the trustworthiness of a sensor node. The remote attestation is based on challenge-response protocol. A verifier can verify the trustworthiness of a sensor node by attesting it′s integrity of program memory. In remote attestation, both random padding and time-based detection approach are essential. However, in a large-scale WSN, time-based detection approach is susceptible to varying transmission delays. Therefore, many hardware-based remote attestation schemes depending on a tamper-proof chip have been proposed. The tamper-proof chip is employed to act as a remote agent, therefore, it must store challenge-response pairs for verifying the trustworthiness of the sensor node.
In this thesis, we propose a remote attestation with lightweight tamper-proof chip. With stenography that we applied, the chip does not need to store challenge-response pairs. The challenge-response pairs are randomly stored in platform while only the lightweight tamper-proof chip is aware of the memory locations of these challenge-response pairs.
