Patent ID: 8769669

Claim:
A user device comprising: a processor configured to: implement a digital signature scheme based on one or more mnemonic-aided secrets that authenticates a user, wherein the digital signature scheme comprises a first digital signature and a second digital signature; authenticate the user using the first digital signature at a first predefined time; and authenticate the user using the second digital signature at a second predefined time; and a device input system coupled to the processor and configured to detect a plurality of atomic motions implemented on the user device, wherein the mnemonic-aided secrets are sensory based mnemonics, wherein the first digital signature is a first combination of one or more secrets and one or more atomic motions associated with the secrets implemented on the user device, wherein the second digital signature is a second combination of one or more secrets and one or more atomic motions associated with the secrets implemented on the user device, wherein the digital signature scheme uses an image based mnemonic as one of the mnemonic-aided secrets to authenticate the user, wherein the device input system is a touch screen, wherein the image based mnemonic comprises an image displayed on the touch screen that includes one or more image objects that allows the user to remember the secrets, wherein the secrets correspond to one or more points that coincide with the image objects and an input order of the points, wherein the secrets comprise one or more locations on the image and one or more predefined time intervals that correspond to the atomic motions that coincide with the image objects, and wherein the image based mnemonic corresponds to a series of ordered atomic motions implemented with one or more predefined time intervals.