Abstract: Many governments released some mobile phone app to fight the spread of novel diseases, such as for the COVID-19 pandemic to assist health officials in tracking down exposures after an infected individual is identified. However, there are important privacy implications of the existence of such tracking apps. In order to solve the influence of current contact tracking on user privacy, this paper analyzes, discusses and summarizes the privacy risks and protection issues in current contact tracking for the first time, aiming at improving privacy issues without reducing the usefulness to public health. We hope in writing this document to ensure that privacy is a central feature of conversations surrounding mobile contact tracing apps and to encourage community efforts to develop alternative effective solutions with stronger privacy protection for the users.

Key words: COVID-19,  , privacy preserving,  , contact tracing