Multi-factor authentication

MULTI-FACTOR AUTHENTICATION Methods, systems and devices for multi-factor authentication (MFA) are described. An MFA device (102) includes a plurality of tiles (108), a frame (110) to hold the tiles (108) and a 5 stylus (112) movable over the frame (110) and the tiles (108). Each of the tiles (108) includes at least one of visible indicia (114) and tactile indicia (116), for representing a notation, and at least one track of acoustic code generation indicia (118). The acoustic code generation indicia (118) of each tile (108), on being swiped, generate a complex sound waveform that encodes a composite binary pattern. The composite binary pattern comprises information blocks including 0 a device identifier block for a device identifier associating the MFA device (102) with a user, a biometric block for at least a part of a biometric pattern of the user, and a data block for the notation of the corresponding tile (108). «To be published with Fig. la>> o < ( ... co -~ ~ -~c -