Systems and methods for secure rfid/nfc communications

A device comprising:

• a passive near-field communication (NFC) tag that includes processing circuitry;
• an antenna comprising an inductor configured to generate an electric current in response to exposure to a magnetic field;
• and
• a sensor system configured to detect a physical input;
• wherein the device is configured to:
• generate, using the inductor, a first electric current based on exposure to a magnetic field generated by an NFC tag reader, wherein the first electric current includes a request for information from the NFC tag reader,
• in response to generating the first electric current, obtaining one or more inputs including at least one representation of a physical input detected by a sensor system of the device;
• in accordance with the one or more inputs satisfying each of the one or more criteria, providing a second electric current to the antenna to transmit the information;
• and
• in accordance with the one or more inputs failing to satisfy at least one of the one or more criteria, refraining from providing the second electric current to the antenna.

A device comprising:

• a radio-frequency identification (RFID) tag that includes processing circuitry;
• an RF antenna configured to generate an electrical current in response to receiving a signal in an RF frequency range;
• and
• a sensor system configured to detect one or more physical inputs;
• wherein the device is configured to:
• in response to receiving the signal, detect, using a photoresistor of the device, an amount of light impinging on the device;
• in accordance with the amount of light exceeding a light threshold, obtain information from storage on the device and provide a second electric current representing the information to the antenna for transmission;
• and
• in accordance with the amount of light failing to exceed the light threshold, refrain from providing the second electric current to the antenna.