Cryptography System for Wireless Charging Modules


This technology secures power transfer between compliant wireless chargers and devices. Through public authentication key protocol, this technology can provide wireless power to multiple devices at once, such as in Internet of Things (IOT) applications.

Problem Addressed

Coupled inductors enable wireless recharging of personal electronics, wearable technologies, and IOT devices. Counterfeit wireless chargers that do not fulfil power specs of a device can send harsh transient signals, causing damage in the device’s battery and surrounding hardware. Secure hash algorithm (SHA) authentication protocols have been used to avoid charging problems between a charger-device pair. Unfortunately, these security protocols are not suitable for IOT systems, where a charger supplies power to multiple receivers.


This technology employs a cryptography method that validates access keys in order to allow charging between wireless receivers and compliant chargers. The cryptography method follows a public authentication key protocol, where a receiver stores multiple public keys and a charger stores a single private key. If one of its public keys pairs with a charger’s private key, the receiver establishes a secure connection and begins the wireless power transfer process. A receiver also contains an envelope detector, which determines if the receiver is in proximity to the charger for successful power transfer.


  • Secure wireless power transfer
  • Wirelessly charge multiple devices using one compliant charger

Intellectual Property

IP Type: Granted Patent

IP Title: Detuning for a resonant wireless power transfer system including cryptography

IP Number: 10,651,687


IP Type: Published PCT Application

IP Title: Detuning for a resonant wireless power transfer system including cryptography

IP Number: WO2019/156868