Fuente: Wipo "IOT" According to one embodiment of the present disclosure, an IoT device encrypts IoT data to transmit encrypted IoT data to a server by using surrounding devices. A user device requests IoT data required for the server to acquire the IoT data to share the IoT data in real time. In one embodiment, the IoT device performs only relatively low-performance operations of an attribute-based encryption technique to encrypt IoT data collected through a sensor, and outsources the remaining steps including high-performance operations of an attribute-based encryption technique to surrounding devices providing an external communication network connection for the IoT device to generate final encrypted text. According to one embodiment, the user device generates an attribute bloom filter by using an access policy of the user device to request IoT data encrypted in accordance with an attribute-based encryption technique to acquire the IoT data. According to one embodiment, a cloud server receives and stores the IoT data encrypted in accordance with the attribute-based encryption technique by the IoT device and the surrounding devices, and transmits IoT data searched using an attribute bloom filter received by a request of a user device as a query to the corresponding user device. COPYRIGHT KIPO 2024