| CPC H04L 63/0861 (2013.01) [G07C 9/257 (2020.01); H04L 63/0428 (2013.01); H04L 63/0853 (2013.01); H04L 67/306 (2013.01); H04W 12/63 (2021.01); H04W 12/71 (2021.01); H04W 60/00 (2013.01); H04W 12/64 (2021.01)] | 20 Claims |

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1. A method, comprising:
receiving, at a first computing device, registration information including a device identifier associated with a second computing device and decryption information, the first computing device having access to a collection of entries including device identifiers associated with a plurality of devices;
transmitting, from the first computing device, a beacon signal;
receiving, at the first computing device, one or more signals generated and broadcast by a second computing device in response to receiving the beacon signal from the first computing device, the one or more signals including a value associated with the second computing device;
detecting a trigger condition associated with proximity and direction of movement of the second computing device relative to the first computing device based on the one or more signals transmitted by the second computing device; and
based on detecting the trigger condition, decrypting the value from the one or more signals using the decryption information.
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