Aspects of the present disclosure include methods, apparatuses, and computer readable media for controlling access including generating a random string or pseudorandom string, acoustically broadcasting a beacon message comprising the random string or pseudorandom string, acoustically receiving, in response to acoustically broadcasting the beacon message, an authentication message comprising a user identification and an authentication string, obtaining a password associated with the user identification, computing a verification string using the password and the random string or pseudorandom string, verifying the authentication string in the authentication message using the verification string, and transmitting, in response to successfully verifying the authentication string in the authentication message, an unlocking message to the access controlled point to unlock the access controlled point.