Systems and methods for disrupting unauthorized communication in low frequency radio communication devices are provided. Traditional systems and methods may fail to provide for disrupting unauthorized communications by generating low frequency signals in the same band as the low frequency bands of the low frequency radio communication devices. Embodiments of the present disclosure provides for overcoming the limitations faced by the traditional systems and methods by generating, via a square wave generator and a device coil of a low frequency radio communication device, low frequency signals; integrating the low frequency signals on a computing device by implementing a power controlling technique; and disrupting, via the integrated low frequency signals on the computing device, unauthorized communications in the low frequency radio communication device.

The present disclosure relates to a communication method related with channel width agile. The method uses a channel generation circuit at a signal transmitting end to generate a channel whose channel width can be changed according to a certain law, and a channel detection circuit at a signal receiving end corresponding thereto to detect the corresponding channel width by the same channel width agile law, thereby achieving the secure reception of the signal. Due to the agility of the channel width, communication security is ensured, and it does not conflict with other technologies (such as frequency hopping), and the channel width can be dynamically allocated. In this way, the advantages of high security, compatibility, and high spectrum utilization can be achieved. Meanwhile, the method realizes the maximum possible optimization of the channel and is very creative.

In some examples, a system includes a propulsor engine and a controller configured to determine a frequency for a new communication session on a communication channel based on a frequency of a previous communication session, wherein the frequency for the new communication session is different than the frequency of the previous communication session. In some examples, the controller is further configured to establish the new communication session via the communication channel with the propulsor engine. In some examples, the controller is also configured to exchange information with the propulsor engine at the frequency for the new communication session via the communication channel.

A system for near field communications is provided. The system can include a near field generator configured to generate a near field detectable signal comprising information. The system can include a near field detector configured to receive the near field detectable signal and output the information. The system can include an Electro-Magnetic (EM) shield surrounding the near field generator to block EM radio frequency (RF) signals in the vicinity of the near field generator from interfering with operations of the near field generator. The EM shield does not prevent communication of the near field detectable signal between the near field generator and the near field detector. The EM shield can be configured to reduce magnetic field loss from eddy currents in the EM shield as the near field detectable signal passes through the EM shield.

The present disclosure relates to a communication method related with channel width agile. The method uses a channel generation circuit at a signal transmitting end to generate a channel whose channel width can be changed according to a certain law, and a channel detection circuit at a signal receiving end corresponding thereto to detect the corresponding channel width by the same channel width agile law, thereby achieving the secure reception of the signal. Due to the agility of the channel width, communication security is ensured, and it does not conflict with other technologies (such as frequency hopping), and the channel width can be dynamically allocated. In this way, the advantages of high security, compatibility, and high spectrum utilization can be achieved. Meanwhile, the method realizes the maximum possible optimization of the channel and is very creative.

Provided is a jamming defense system. In the jamming defense system for wireless local area network communication between an access point (AP) and a user node, the AP that transmits and receives a message to and from the user node generates an AP secret key value by measuring a signal reception strength for the message, and the user node that transmits and receives a message to and from the AP generates a user node secret key value by measuring a signal reception strength for the message.

The invention provides a system and method for intercepting a target UAV by releasing a plurality of countermeasure (CM) objects in a projected path thereof to form a 3D countermeasure cloud. Pieces of flexible materials configured to become ensnared in the propellers of the target UAV or otherwise interfere with their ability to provide lift and thrust capabilities to the UAV. A UAV interception control system may track the target UAV and compute a location probability volume therefor using a modified Kalman filter to decide on a projected interception location and time.

A method and system for communicating with an unmanned aerial vehicle (UAV) over a cellular network. The UAV need not be the same type or model and may have different communications protocols. A coded message transmitted over the cellular network is received at the UAV, decoded and retransmitted to the UAV using its native communications protocol.

A method of transmitting a message using a slow hopping anti-jam waveform, includes generating a sequence with a cryptographic hash function; transmitting, for a predetermined dwell time, a first portion of the message on a first channel having a first baseline frequency; choosing a second channel having a second baseline frequency based on the generated sequence, the second baseline frequency being offset from the first baseline frequency; and transmitting, for the predetermined dwell time, a second portion of the message on the second channel having the second baseline frequency; wherein the two transmitting steps occur sequentially.

A payment processing device can implement a monitoring system to detect for tamper attempts at a physical interface such as a chip card interface. The monitoring system can establish local tamper criteria including a baseline when no chip card is present in the chip card interface, or in some embodiments, when it is known that an authentic chip card is present in the slot. During subsequent evaluations of the chip card interface by the monitoring system, a response received by the monitoring system that deviates from the local test criteria can indicate that a tamper attempt at the chip card interface may have occurred. The payment processing device may also communicate test results to a server for further testing, or for an update of the local test criteria.