Dynamic Unique Word Generation for Secure Radio Communication
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Solution Overview
Problem
Existing radio communication technologies are vulnerable to interception due to the use of static unique words, which can be detected by third parties, leading to potential eavesdropping, even when multiple unique word patterns are employed, as these patterns can be eventually identified through continuous monitoring.
Innovation Solution
A radio communication apparatus that generates a first unique word based on operation time information before communication starts and updates each subsequent unique word on a frame-by-frame basis, ensuring that each radio frame has a distinct unique word, making it difficult for third parties to intercept the communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the same unique word is added to each radio frame during communication, then the communication can be maintained stably, but the communication contents become vulnerable to interception by third parties
Solution Approach 1:
The patent applies the dynamics principle by transitioning from static unique words to dynamically generated unique words. The transmitting apparatus generates unique words using a pseudo-random number generator that creates different unique words for each radio frame based on frame numbers and initialization values. This dynamic generation ensures that even if one unique word is intercepted, subsequent frames use different unique words, preventing continuous interception while maintaining communication stability.
Solution Approach 2:
The patent implements parameter changes by modifying the unique word parameters (initialization values and frame numbers) for each radio frame. The transmitting apparatus changes the initialization value of the pseudo-random number generator at regular intervals (e.g., every N frames) and incorporates the frame number into unique word generation. This parameter variation ensures that unique words change over time, preventing third-party interception while maintaining reliable communication through consistent generation rules known to both transmitter and receiver.
2Difficulty of detecting and measuring
If multiple unique word patterns are used, then the difficulty of detecting unique words increases, but continuous monitoring can still lead to pattern identification
Solution Approach 1:
The patent extends the dynamics principle by implementing multi-level dynamic changes. Instead of using multiple fixed patterns, the system generates unique words dynamically using pseudo-random sequences with changing initialization values. The initialization value changes at regular intervals, and frame numbers provide continuous variation. This creates effectively infinite unique word variations, making pattern detection through continuous monitoring computationally infeasible while maintaining reliable communication through deterministic generation rules.
Solution Approach 2:
The patent introduces an intermediary mechanism - the pseudo-random number generator - that mediates between the need for secure, changing unique words and the requirement for reliable, reproducible communication. The generator uses initialization values and frame numbers as inputs to produce unique words that appear random but are deterministic. This intermediary ensures that both transmitter and receiver generate identical unique words without transmitting the pattern itself, preventing interception while maintaining synchronization.
3Object-affected harmful factors
If unique words are changed on a frame-by-frame basis using fixed patterns, then interception resistance improves, but the generation method remains predictable
Solution Approach 1:
The patent implements parameter changes by using multiple variables (frame number, initialization value, and potentially other counters) in the unique word generation process. The initialization value changes at regular intervals while the frame number changes continuously. This multi-parameter approach creates high variability in generated unique words, improving interception resistance. The complexity is managed by using standard pseudo-random number generation algorithms that are computationally efficient and can be implemented in typical radio communication devices.
Data Source
AI summary
A radio communication apparatus makes it possible to prevent contents of communication from being intercepted. The radio communication apparatus includes a generation unit configured to generate a first unique word based on operation time information of the radio communication apparatus before communication with a radio communication apparatus is started, and generate, for each radio frame, an ith unique word (i: an integer equal to or greater than two) based on an (i−1)th unique word when the communication is started, and a transmitting unit configured to transmit a first radio frame including the first unique word and an ith radio frame including the ith unique word to the radio communication apparatus.