As far as communication goes, reverse sonar holography seems like it could establish a reliable line of communication, as it uses interference to focus the sound waves at one particular location instead of diffuse them.
However the security of the communication, as others have pointed out, is probably suspect.
At first read, I thought that it would take a considerable amount of computing power to decode this holographic communication. At any point other than the intended target, the recording will be diffused, diluted, and garbled. Increase the number recorder/speakers and increase the broadcast rate, piling more and more garbled sound together and it will become harder and harder to decode.
But what about this attack: If I can sound a ping at the right time so that you record it in your recordings (along with your recording of the honest ping from your base station), when you play back your reverse holographic transmission, I'll get a carbon copy of it delivered right to my doorstep! If I can make my ping frequency match that of your base station, you won't even it got in there.
Looks like you'd better encrypt your 1s and 0s before you send them; you might not know exactly who your data is sent to!
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As far as communication goes, reverse sonar holography seems like it could establish a reliable line of communication, as it uses interference to focus the sound waves at one particular location instead of diffuse them.
However the security of the communication, as others have pointed out, is probably suspect.
At first read, I thought that it would take a considerable amount of computing power to decode this holographic communication. At any point other than the intended target, the recording will be diffused, diluted, and garbled. Increase the number recorder/speakers and increase the broadcast rate, piling more and more garbled sound together and it will become harder and harder to decode.
But what about this attack: If I can sound a ping at the right time so that you record it in your recordings (along with your recording of the honest ping from your base station), when you play back your reverse holographic transmission, I'll get a carbon copy of it delivered right to my doorstep! If I can make my ping frequency match that of your base station, you won't even it got in there.
Looks like you'd better encrypt your 1s and 0s before you send them; you might not know exactly who your data is sent to!