Wireless Signal Validation via Independent Link Against Spoofing
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Solution Overview
Problem
Existing wireless communication systems are susceptible to spoofing attacks, where adversaries broadcast false signals to cause devices to operate incorrectly, and current anti-spoofing methods require encryption, keying, public keys, or remote server authentication, which are difficult to implement or provide inadequate protection.
Innovation Solution
A wireless receiver validates signals using a validation signal from a different source, employing digital signatures, message authentication codes, or hash chains to confirm the authenticity of the target signal, without requiring communication with a remote server, by comparing the validation signal with the target signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If private key encryption is used to counter spoofing, then signal security is improved, but device complexity increases and protection is insufficient
Solution Approach 1:
The validation system segments the anti-spoofing function into two independent parts: (1) a validation signal transmitter that sends validation data through a trusted channel, and (2) a validation signal receiver that compares received validation data with expected validation data. This segmentation allows the receiver to validate signals without implementing complex encryption algorithms, thereby improving signal security while reducing device complexity.
Solution Approach 2:
The patent introduces a validation signal as an intermediary element that mediates between the transmitter and receiver. The validation signal contains validation data that can be independently verified without requiring the receiver to implement encryption algorithms. This intermediary approach enables security validation while keeping the receiver device simple.
2Reliability
If public keys or remote server authentication is required, then signal validation capability is improved, but ease of operation deteriorates
Solution Approach 1:
The validation system enables self-service validation where the receiver independently verifies signal authenticity using the validation signal and comparison logic built into the receiver. The receiver compares the validation data from the validation signal with the validation data extracted from the received signal, enabling autonomous validation without requiring connection to remote servers or complex key management operations.
3Reliability
If multiple receivers communicate with each other, then spoofing detection capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the essential validation functionality into a standalone comparison operation. Instead of requiring multiple receivers to communicate and coordinate their validation processes, the system extracts the validation data into a separate validation signal that can be independently verified by each receiver through a simple comparison operation, reducing device complexity while maintaining spoofing detection capability.
Data Source
AI summary
For validation of wireless signals, a wireless receiver receives a validation signal that includes information from a target signal. By using digital signature, message authentication code (MAC), and/or hashing, the validation signal is verified to be from a trusted source. By comparing the information from the verified validation signal with the target signal, the target signal is confirmed to be genuine or not a spoofing signal. In one approach, the validation signal is provided from a different transmission source than the target signal. In another approach, modulation estimation rather than known modulation is used as the information for the validation signal for comparison with the target signal despite not knowing the spread pattern of the coding. In yet another approach, a one-way function is used to generate a pseudorandom code to spread a first component of the a first signal below the noise floor. The input to the one-way function is a second component sent at a time later than the time.