US Patent 9672337 Dynamic authentication

A method, a device, and a non-transitory storage medium having instructions to randomly select a file that provides a mnemonic for a user input; present the file; receive a user input that is responsive to a presentment of the file; determine whether the user input is correct; and grant further access and use of a device based on a determination that the user input is correct, wherein when the user input is correct, the user is authenticated.