Abstract: In one embodiment, a first computing device may establish a spatial gap, wherein the spatial gap is defined by a maximum distance from the first computing device for computing devices requesting validation of credentials. The first computing device may then exchange with a second computing device, data transmissions to execute a handshake protocol, wherein the first computing device transmits communication signals at a specified signal strength, and wherein the specified signal strength is configured based on the maximum distance. The first computing device may then determine that the second computing device remained within the spatial gap throughout the handshake protocol, and then grant access to the second computing device.

Abstract: In particular embodiments, a method for transmitting authentication data using acoustical means, comprising: encoding, by a first device, information into an acoustic signal; emitting, by an audio output component of the first device, the acoustic signal; detecting, by an audio input component of a second device, the acoustic signal; and decoding, by the second device, the acoustic signal into one or more pieces of information.

Abstract: In particular embodiments, a method for transmitting authentication data using acoustical means, comprising: encoding, by a first device, information into an acoustic signal; emitting, by an audio output component of the first device, the acoustic signal; detecting, by an audio input component of a second device, the acoustic signal; and decoding, by the second device, the acoustic signal into one or more pieces of information.