Passive IoT PHY Security Keys for Secure Backscatter Links
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing wireless communications systems with passive IoT devices lack secure physical layer (PHY) security, making them vulnerable to interception and attacks, which compromises data privacy and security.
Innovation Solution
Implementing PHY security keys at the physical layer to secure communication between a source device, a passive wireless device, and a reader device using backscattering techniques, where the passive wireless device uses different security keys for communication with the source and reader devices, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If passive wireless devices are used in wireless communication systems, then energy consumption is reduced and device simplicity is improved, but security vulnerability increases due to lack of PHY layer security
Solution Approach 1:
The patent segments the security mechanism by introducing separate PHY security keys for different communication links (source-to-passive device and passive device-to-reader). This segmentation allows the passive device to maintain security without requiring complex integrated security processing, thus preserving energy efficiency while improving security reliability.
Solution Approach 2:
The patent introduces PHY security keys as an intermediary security layer at the physical layer. These keys act as mediators that secure communications without requiring the passive device to perform complex cryptographic operations at higher layers, thereby maintaining low energy consumption while establishing reliable security protection.
2Reliability
If PHY security keys are implemented at the physical layer, then security reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies local quality by implementing security functions specifically at the PHY layer where they are most needed, rather than distributing complex security processing throughout the device. The passive wireless device only needs to handle simple key-based security operations locally at the physical layer, avoiding the need for complex overall device architecture.
Solution Approach 2:
The passive wireless device utilizes the incoming RF signals for both power harvesting and security key operations. The device self-services by using the received signals to maintain its security functions without requiring additional power consumption or complex processing infrastructure.
3Object-affected harmful factors
If separate PHY security keys are used for different communication links, then security against interception is improved, but key management complexity increases
Solution Approach 1:
The patent extracts the security key management function from the passive device itself and places it in the active devices (source and reader). The passive device simply uses the provided keys without managing them, thereby reducing interception vulnerability while keeping the passive device complexity low. The active devices handle key generation and distribution, separating concerns effectively.
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
Enhances system security and resilience against attacks, maintaining privacy and increasing data rates and system capacity in IoT deployments by securing communications through passive wireless devices.
Implementation Method 1
transmitting a second message via a backscattering of the first message
Data Source
AI summary
This disclosure provides systems, methods and apparatus, including computer programs encoded on computer storage media, for physical layer security for passive Internet of Things (IoT) devices. In some aspects, a source device and a reader device may communicate via a passive wireless device, such as an IoT tag, which may reflect or backscatter signaling from the source device to the reader device. The source device, the reader device, and the passive wireless device may secure communication in a physical layer (PHY) in accordance with one or more PHY security keys. As such, the source device may transmit a first message to the passive wireless device in accordance with a first PHY security key and the passive wireless device may transmit a second message to the reader device in accordance with a second PHY security key to secure communication to and from the passive wireless device.