1. A method comprising: querying a user to select, in a user-determined ordered sequence, multiple items of multimedia data stored on a computing device to be used in connection with one or more cryptographic actions associated with said computing device, wherein said computing device comprises a mobile device; protecting respective ones of multiple sub-components of an item of cryptographic information within respective ones of the multiple selected items of multimedia data such that each of the multiple selected items of multimedia data protects at least one of the multiple subcomponents of the item of cryptographic information, and wherein said protecting comprises (i) encoding and storing, into at least a first of the multiple selected items of multimedia data, one or more values, and (ii) encoding and storing, into at least a second of the multiple selected items of multimedia data, authentication data in a manner indicated by the one or more values stored in the at least a first of the multiple selected items of multimedia data; presenting, through a user interface associated with said computing device, a collection of multimedia data stored on said computing device in connection with an authentication request to access a protected resource associated with said computing device, wherein said collection of multimedia data includes (i) the respective ones of the multiple selected items of multimedia data within which the respective ones of the multiple sub-components of the item of cryptographic information are protected and (ii) one or more additional items of multimedia data encoded with authentication data recognized by the computing device as log-in credentials to an account associated with an attempted attack on the computing device; extracting each of the respective ones of the multiple sub-components of the item of cryptographic information protected within the respective ones of the multiple selected items of multimedia data, upon user identification of the respective ones of the multiple selected items of multimedia data, in the user-determined ordered sequence, to grant access to the protected resource associated with said computing device; and performing the one or more cryptographic actions using the protected resource; wherein said querying, said protecting, said presenting, said extracting, and said performing are carried out by at least one computer device.