Media type: E-Article Title: Challenges and future directions of secure federated learning: a survey Contributor: Zhang, Kaiyue; Song, Xuan; Zhang, Chenhan; Yu, Shui Published: Springer Science and Business Media LLC, 2022 Published in: Frontiers of Computer Science, 16 (2022) 5 Language: English DOI: 10.1007/s11704-021-0598-z ISSN: 2095-2228; 2095-2236 Origination: Footnote: