Wi-fi traffic is encrypted, but researchers have found plaintext protocol messages provide enough data for keystroke analysis, enabling the extraction of information like passwords. “By continuously recording the BFIs in the wi-fi frames from Bob during the time window of Bob’s password typing, Eve can obtain a time series of BFI samples," the paper stated. ”The research was conducted by Jingyang Hu and Hongbo Jiang of China’s Hunan University, Hongbo Wang, Tianyue Zheng, Jingzhi Hu and Jun Luo of Nanyang Technological University in Singapore, and Zhe Chen of Fudan University in China