Patent ID: 8471904

Claim:
A security apparatus with a hidden security technique, the security apparatus comprising: capture circuitry to capture an image and generate a checksum from the image; a wireless interface coupled to the capture circuitry, the wireless interface configured to: transmit the image to a monitoring station over a wireless network; and a power interface coupled to the capture circuitry, the power interface configured to: supply power to the capture circuitry and transmit the checksum to the monitoring station over a power line network; wherein, to determine that a replay attack is ongoing, the monitoring station detects a mismatch between a checksum calculated from the image received over the wireless network and the checksum received over the power line network; and wherein, to determine that a wireless jamming attack is ongoing, the monitoring station detects receipt of the checksum over the power line network in addition to failure to receive the image over the wireless network.