Pilot-Signal Key Generation for Low-Complexity Zero-Power Terminals
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Solution Overview
Problem
The challenge of securely generating keys for zero-power terminals in contactless data transmission systems without increasing complexity.
Innovation Solution
A method involving a first device receiving a pilot signal, calculating a channel estimation value, generating a key based on quantization sequences, and transmitting response signals for a second device to generate a corresponding key, while a second device calculates a pilot signal and generates a key based on received response signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a key is used for communication to ensure security of data transmission for the zero-power terminal, then security is improved, but the complexity of key generation becomes a problem
Solution Approach 1:
The patent applies preliminary action by pre-sharing a pilot key between the zero-power terminal and the reader before actual communication. This pre-established secret enables the terminal to generate secure communication keys without requiring complex key generation mechanisms during operation, thus maintaining security while reducing complexity for the resource-constrained terminal
Solution Approach 2:
The patent uses a pilot signal as an intermediary carrier that embeds key generation information. The pilot signal mediates the key establishment process by allowing the terminal to derive communication keys from channel characteristics observed during pilot signal reception, avoiding direct complex key exchange protocols
2Reliability
If complex key generation methods are used to ensure security, then security is improved, but the computational resources and complexity increase
Solution Approach 1:
The patent enables the zero-power terminal to self-generate secure communication keys by utilizing channel characteristics naturally observed during pilot signal reception. The terminal processes the received pilot signal through channel estimation and quantization to autonomously derive keys, eliminating the need for complex external key distribution infrastructure or high-computational protocols
Solution Approach 2:
The patent transforms physical channel parameters (amplitude, phase, timing) observed during pilot signal reception into cryptographic key material through quantization processes. By changing the representation of channel characteristics from analog measurements to discrete quantization sequences, the system generates secure keys using simple processing suitable for resource-constrained terminals
Data Source
AI summary
A key generation method includes: receiving, by a first device, a first pilot signal transmitted by a second device; calculating, by the first device, a channel estimation value based on a first pilot key and the first pilot signal; generating, by the first device, a first key based on multiple first quantization sequences; and transmitting, by the first device, multiple response signals to the second device based on the channel estimation value and the multiple first quantization sequences, where the multiple response signals are used for the second device to generate a second key.