Motion-based challenge-response authentication mechanism

A system comprising:

• one or more processors;
• and
• one or more computer-readable storage media storing program instructions which, when executed by the one or more processors, are configured to cause the one or more processors to perform a method comprising:
• presenting a motion-based challenge-response instruction to a user via a user interface of a first device of a plurality of devices associated with the user and communicatively coupled to one another by a network, wherein the motion-based challenge-response instruction describes at least one motion that is performable by the user and detectable by a second device of the plurality of devices, wherein the motion-based challenge-response instruction is based on a current Global Positioning System (GPS) location of the first device and an availability of the second device inferred from a usage history of the second device, wherein the motion-based challenge-response instruction includes a customized text uniquely identifying a respective motion according to custom motion descriptions created by the user, and wherein the motion-based challenge-response instruction is configured to differentiate humans from bots;
• determining that device data from the second device matches the at least one motion;
• and
• authenticating the first device in response to determining that the device data matches the at least one motion, wherein authenticating the first device indicates that the user is a human user.

A computer program product comprising one or more computer readable storage media, and program instructions collectively stored on the one or more computer readable storage media, the program instructions comprising instructions configured to cause one or more processors to perform a method comprising:

• presenting a motion-based challenge-response instruction to a user via a user interface of a first device of a plurality of devices associated with the user and communicatively coupled to one another by a network, wherein the motion-based challenge-response instruction describes at least one motion that is performable by the user and detectable by a second device of the plurality of devices, wherein the motion-based challenge-response instruction is based on a current Global Positioning System (GPS) location of the first device and an availability of the second device inferred from a usage history of the second device, wherein the motion-based challenge-response instruction includes a customized text uniquely identifying a respective motion according to custom motion descriptions created by the user, and wherein the motion-based challenge-response instruction is configured to differentiate humans from bots;
• determining that device data from the second device matches the at least one motion;
• and
• authenticating the first device in response to determining that the device data matches the at least one motion, wherein authenticating the first device indicates that the user is a human user.