Proxy-based public-key cryptosystem for secure and efficient IoT-based cloud data sharing in the smart city. - Negalign Wake Hundera; Chuanjie Jin; Dagmawit Mesfin Geressu; Muhammad Umar Aftab; Oluwasanmi Ariyo Olanrewaju; Hu Xiong (Multim. Tools Appl., 2022)