Hong Kong on COVID Tracing App: Security Flaws? What Security Flaws? user data. The city's response: We don't know what you guys are talking about. The Hong Kong government launched the LeaveHomeSafe app in November of 2020 to help track and combat the pandemic. Available for iOS and Android, the app collects information on a user's location as they travel around the city, culling the data from barcode scans at local restaurants. That might seem pretty innocuous, but given the political turmoil in the city over the past several years, Hong Kong residents aren't the most trusting these days. The...