Pixnapping is a new class of attacks that allows a malicious Android app to stealthily leak information displayed by other Android apps or arbitrary websites. Pixnapping exploits Android APIs and a hardware side channel that affects nearly all modern Android devices. We have demonstrated Pixnapping attacks on Google and Samsung phones and end-to-end recovery of sensitive data from websites including Gmail and Google Accounts and apps including Signal, Google Authenticator, Venmo, and Google Maps...