PASSWORDLESS AUTHENTICATION SYSTEMS AND METHODS

A passwordless authentication method authenticates a user to access a remote computer. A mobile device receives a flash pattern included on a webpage by an authenticator. A body part of a user of the mobile device is biometrically authenticating at the mobile device. Concurrently with the authenticating, a modulated optical signal based upon the flash pattern is emit toward the body part and detected remission of the modulated optical signal by the body part is recorded as a remitted pattern. An indication of authenticity of the user, as determined by the step of biometrically authenticating, and the remitted pattern are communicated to the authenticator, and the user is authenticated to the website based upon the indication of authenticity and a match of the remitted pattern to the flash pattern.