  The lockdowns and travel restrictions in current coronavirus pandemic
situation has replaced face-to-face teaching and meeting with online teaching
and meeting. Recently, the video conferencing tool Zoom has become extremely
popular for its simple-to-use feature and low network bandwith requirement.
However, Zoom has serious security and privacy issues. Due to weak
authentication mechanisms, unauthorized persons are invading Zoom sessions and
creating disturbances (known as Zoom bombing). In this paper, we propose a
preliminary work towards a seamless authentication mechanism for Zoom-based
teaching and meeting. Our method is based on PRNU (Photo Response Non
Uniformity)-based camera authentication, which can authenticate the camera of a
device used in a Zoom meeting without requiring any assistance from the
participants (e.g., needing the participant to provide biometric). Results from
a small-scale experiment validates the proposed method.
