Proximity detection system
Various systems and methods for providing a walk away lock are provided herein. A plurality of data packets may be received at a compute device from a user device. Here, each packet has corresponding time-to-receive value. A baseline latency value of the plurality of data packets may be determined based on their respective time-to-receive values. Additional data packets may be received from the user device, each of these additional data packets having their own corresponding time-to-receive values. A current latency value of the additional data packets may be calculated based on the respective time-to-receive values. A security operation may be performed based on the baseline latency value and the current latency value.
1. A system of providing a walk away lock, the system comprising:
means for receiving, at a compute device, a plurality of data packets from a user device, each packet having corresponding time-to-receive values;
means for determining a baseline latency value of the plurality of data packets based on the respective time-to-receive values;
means for receiving additional data packets from the user device, each of the additional data packets having corresponding time-to-receive values;
means for calculating a current latency value of the additional data packets based on an average of the corresponding time-to-receive values; and
means for performing a security operation based on the baseline latency value and the current latency value,
wherein a particular time-to-receive value of the plurality of time-to-receive values comprises the time period from when the compute device started receiving a first byte of the data packet to when the compute device finished receiving a last byte of the data packet.
2. The system of claim 1 , wherein receiving the plurality of data packets is performed over a Bluetooth connection.
3. The system of claim 1 , wherein the means for receiving the plurality of data packets comprises:
means for transmitting a request for a data packet to the user device; and
means for receiving a response from the user device.
4. The system of claim 3 , wherein the response comprises a fixed-size data packet.
5. The system of claim 4 , wherein the fixed-size data packet is 16 KB.
6. The system of claim 1 , wherein the means for receiving the plurality of data packets comprises means for receiving a data packet from the user device, where the user device transmitted the data packet to the compute device without prompting from the compute device.
7. The system of claim 6 , wherein the user device transmitted the data packet to the compute device based on a timer executing on the user device.
8. The system of claim 1 , wherein the means for determining the baseline latency comprises means for averaging the corresponding time-to-receive values of the plurality of data packets.
9. The system of claim 1 , wherein the means for averaging the corresponding time-to-receive values of the additional data packets comprises means for calculating a weighted average of the corresponding time-to-receive values of the additional data packets.
10. The system of claim 9 , wherein the means for calculating the weighted average comprises:
means for calculating a mean of a number of the corresponding time-to-receive values of the additional data packets;
means for weighting the mean of the number of the corresponding time-to-receive values of the additional data packets, to provide a weighted mean;
means for weighting a most recent time-to-receive value of the additional data packets, to provide a weighted recent value; and
means for adding the weighted mean to the weighted recent value, resulting in the weighted average.
11. The system of claim 1 , wherein the means for performing the security operation based on the baseline latency value and the current latency value comprises:
means for determining that the current latency exceeds the baseline latency by more than a threshold amount; and
means for locking the compute device when the current latency exceeds the baseline latency by more than the threshold amount.
12. The system of claim 11 , wherein the threshold amount is 30% greater than the baseline latency.
13. The system of claim 11 , wherein the threshold amount is a fixed value greater than the baseline latency.
14. The system of claim 1 , wherein the means for performing the security operation based on the baseline latency value and the current latency value comprises:
means for determining that the current latency exceeds the baseline latency by less than a threshold amount; and
means for unlocking the compute device when the current latency exceeds the baseline latency by less than the threshold amount.
15. The system of claim 14 , wherein the threshold amount is 20% greater than the baseline latency.
16. The system of claim 14 , wherein the threshold amount is a fixed value greater than the baseline latency.
17. The system of claim 1 , further comprising means for recalculating the baseline latency in response to detecting a triggering event.
18. The system of claim 17 , wherein the triggering event comprises user activity at the compute device.
19. The system of claim 17 , wherein the triggering event comprises a timeout period.