Backscatter Session Setup for Low-Power Secure AMP Communications
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Solution Overview
Problem
Ambient power (AMP) devices, which harvest energy from the environment, face challenges in initiating secure wireless communication sessions due to limited power availability and the need for extensive handshake protocols that are inconsistent with their low-power nature, posing risks in unsecured data transmission and deployment in IoT settings.
Innovation Solution
AMP devices use wireless backscattering to transmit initialization request frames with a predetermined bit pattern and spreading code, enabling secure communication sessions by authenticating and encrypting data exchange with powered wireless devices using device-specific spreading codes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If AMP devices use traditional wireless communication protocols to initiate secure communication sessions, then security authentication can be established, but power consumption exceeds the limited energy availability of AMP devices
Solution Approach 1:
The communication protocol is segmented into two distinct phases: a low-power backscattering phase for initialization and authentication, and a traditional wireless communication phase for encrypted data exchange. This segmentation allows AMP devices to perform security handshakes using minimal energy while maintaining secure communication capabilities.
Solution Approach 2:
The system employs periodic action by using backscattering only for initialization requests and authentication, then switching to continuous encrypted communication for data exchange. This periodic alternation between low-power and normal-power modes reduces overall energy consumption while maintaining security.
2Reliability
If AMP devices perform extensive handshake protocols for secure communication, then authentication and encryption can be established, but communication complexity increases beyond what low-power devices can handle
Solution Approach 1:
The complex authentication and encryption handshake protocols are extracted from the AMP device and implemented in the powered wireless device. The AMP device only needs to perform simple backscattering operations to initiate communication and authenticate, while the powered device handles the computationally intensive security protocols.
Solution Approach 2:
The backscattering mechanism serves as an intermediary that enables the AMP device to participate in secure communication without directly implementing complex handshake protocols. The backscattered signals carry authentication information while the powered device processes the security handshakes.
3Use of energy by moving object
If AMP devices transmit data without encryption to conserve power, then power consumption remains low, but data transmission security is compromised
Solution Approach 1:
Encryption is applied in preliminary action by establishing encrypted communication channels before actual data exchange. The AMP device initiates secure session setup using backscattering, and once encryption keys are established, all subsequent data transmissions are automatically encrypted without additional power cost.
Solution Approach 2:
The system applies partial encryption action by encrypting only the critical authentication and control messages during the handshake phase, while allowing more flexible encryption options for data payload. This partial approach reduces computational overhead while maintaining essential security.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method allows AMP devices to initiate and maintain secure wireless communication sessions efficiently, despite low power, reducing power consumption and minimizing risks of unencrypted data transmission.
Implementation Method 1
backscattering, by an ambient power (AMP) device that harvests environmental energy, radio frequency (RF) energy received in a wireless signal
Data Source
AI summary
A method includes backscattering, by an ambient power (AMP) device that harvests environmental energy, radio frequency (RF) energy received in a wireless signal from at least one of a powered wireless device or a helper wireless device. The method includes causing, by the AMP device, an initialization request frame to be transmitted to the powered wireless device within a backscattered signal using a first spreading code. The first spreading code can encode a predetermined bit pattern, which is recognizable by the powered wireless device, and an identifier (ID) of the AMP device. The method includes receiving, by the AMP device, from the powered wireless device, an ID request frame in response to the powered wireless device detecting the initialization request frame and recognizing the ID of the AMP device. The ID request frame can trigger an attempt to initiate an encrypted wireless communication session with the powered wireless device.