| CPC G06F 21/31 (2013.01) [G06F 2221/2103 (2013.01); G06F 2221/2133 (2013.01)] | 20 Claims |

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1. A method of securing a computer resource against unauthorized access by authenticating user computer systems attempting to access the computer resource, the method comprising:
sending, by a processing device, a challenge data structure to a user computer system, wherein the challenge data structure defines a challenge user interface to be presented to a user of the user computer system, wherein the challenge user interface comprises a playback control area for playing an audio clip comprising a plurality of sounds, and wherein the challenge user interface prompts the user to select two or more answers corresponding to two or more sounds from a multiple choice answer area of the challenge user interface;
obtaining a user selection from the multiple choice answer area indicating a selection of the two or more answers corresponding to the two or more sounds; and
providing access to the computer resource for the user computer system based on whether the two or more sounds are contained within the plurality of sounds of the audio clip.
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