Techniques provided herein relate to electronic authentication on public systems. A backend system receives at least one electronic data action request from a publicly available client system that is shared amongst a plurality of users. At least a portion of the primary authentication information is received from a secondary device separate from the publicly available client system. The electronic data action request is authenticated by determining if the primary authentication information matches expected primary authentication information that is expected to complete the electronic data action request. Performance of the electronic data action request is facilitated when the primary authentication information matches the expected primary authentication information.