Smart Key Storage Case Shielding Relay Attacks
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Solution Overview
Problem
Existing keyless entry systems are vulnerable to relay attacks, where a repeater intercepts and relays a call signal to a smart key, allowing unauthorized access to vehicles, and existing countermeasures require modifications to both in-vehicle devices and smart keys, making them incompatible with existing systems.
Innovation Solution
A smart key storage case that shields signals between the in-vehicle device and the smart key, using a relay unit with reception and transmission antennas, a switch, a radio communication unit, and a controller to selectively relay call signals and response signals, ensuring the smart key only responds when authorized by a registered radio communication terminal, preventing illicit control and theft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a relay attack countermeasure system is implemented by modifying in-vehicle devices and smart keys with multiple antennas and measurement signals, then relay attack prevention capability is improved, but device complexity and compatibility with existing systems deteriorate
Solution Approach 1:
The invention divides the relay attack prevention function into two separate components: a storage case that shields the smart key from external relay attacks, and a relay unit that handles authentication signals. This segmentation allows the smart key itself to remain simple and compatible with existing systems, while the storage case provides the security functionality independently.
Solution Approach 2:
The storage case acts as an intermediary between the smart key and the external environment. It physically shields the smart key from relay attack signals while allowing legitimate authentication signals to pass through when needed. The relay unit serves as another intermediary that mediates between the in-vehicle device and the smart key, managing the authentication process securely.
2Ease of operation
If the smart key is always accessible for keyless entry operation, then ease of operation is improved, but vulnerability to relay attacks increases
Solution Approach 1:
The storage case provides preliminary protection by shielding the smart key from relay attack signals before they can reach the smart key. The case is designed with electromagnetic shielding properties that block unauthorized signals, preventing relay attacks in advance while allowing the smart key to remain accessible for legitimate use when the case is opened or the relay unit is activated.
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
The solution effectively prevents relay attacks without modifying existing in-vehicle devices or smart keys, allowing normal operation of the keyless entry system while ensuring secure authentication and authorization, using commonly available radio communication terminals like mobile phones for enhanced security.
Implementation Method 1
The storage case main body is configured to shield a signal transmitted and received between the in-vehicle device and the smart key of the keyless entry system
Implementation Method 2
the reception antenna is disposed outside the storage case main body, and is configured to receive call signals periodically transmitted from the in-vehicle device to the outside of the vehicle and the inside of the cabin
Implementation Method 3
the transmission antenna is disposed inside the storage case main body, and is configured to radiate the call signal received by the reception antenna to the inside of the storage case main body
Data Source
AI summary
A smart key storage case includes a storage case main body that can shield a signal, a transmission path through which a call signal from an in-vehicle device is radiated into the storage case main body, a switch that conducts/cuts off the transmission path, a radio communication unit that performs data communication with a radio communication terminal, a controller that controls the switch, and a response signal relay section that radiates a response signal from the smart key inside the storage case main body to the outside. When the radio communication terminal is present outside the vehicle, the controller controls the switch so that the call signal transmitted from the in-vehicle device to the inside of the cabin is cut off and the call signal transmitted to the outside of the vehicle is transmitted.