Translation in Untrusted IoT Environments

Internet of Thing (IoT) systems, such as smart buildings and smart cities, provide services to users (individuals and organizations) in various aspect of our lives. To provide such services, IoT systems need to handle data captured from multiple devices/sensors, and translation of data processing policies agreed by users (high-level) into commands for devices (device-level). The underlying assumption is that users trust IoT systems in honoring their policies. However, this trust assumption is incorrectly positioned since IoT systems may not be honest or may fall victim to cyberattacks. We address such concerns by providing mechanisms to help in ensuring trust and accountability at the time of translating a contract (agreed and signed policies). The objective of the proposed scheme is two fold, (1) translation of contracts from a high-level to device-level, (2) attestation of the translation. We have implemented the proposed scheme for contract translation and attestation of translation as a module and integrated it with the TIPPERS system (our IoT testbed under development). The results of our experiments highlight the feasibility of our proposed schemes.