Dynamic Transmission Characteristics for Secure Message Transmission
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Solution Overview
Problem
Existing message transmission systems, such as those used for movable barrier operators, face security vulnerabilities due to potential eavesdropping and unauthorized access, particularly when using rolling codes, which can be susceptible to brute force attacks and other weaknesses.
Innovation Solution
The method involves selecting a specific transmission characteristic and a corresponding recovery identifier for each message transmission, allowing the transmission of a joint message that includes both the message content and the recovery identifier, which upon reception, enables the selection of the appropriate reception method, thereby enhancing security by increasing the complexity for unauthorized access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If rolling codes are used for message transmission, then security against code reuse is improved, but the system remains vulnerable to brute force attacks and eavesdropping
Solution Approach 1:
The patent changes the transmission parameter by selecting different transmission characteristics (such as modulation schemes, data rates, or frequency offsets) for different messages. This adds a dynamic element to the transmission process where not only the code changes (rolling code) but also the physical layer parameters vary, making eavesdropping and brute force attacks significantly more difficult while maintaining system reliability
Solution Approach 2:
The system dynamically selects transmission characteristics based on message content or predefined patterns. Each message is transmitted with a unique combination of code and transmission characteristic, creating a dynamic transmission profile that adapts with each message. This dynamic approach enhances security against static analysis and replay attacks
2Reliability
If multiple transmission characteristics are used for each message, then security against eavesdropping is improved, but the complexity of matching transmission and reception methods increases
Solution Approach 1:
The transmission system segments the security mechanism into two distinct components: the rolling code element and the transmission characteristic element. By dividing the security approach into these separate but complementary segments, the system achieves enhanced security without requiring a complete redesign of the entire transmission architecture. Each segment can be independently managed and implemented
Solution Approach 2:
The receiver is designed with multi-functionality to handle multiple transmission characteristics. A single receiver unit can detect and process various transmission modes (different modulations, data rates, or frequency offsets) by examining the transmission characteristic associated with each message. This universal capability allows the system to maintain security through diversity while avoiding the need for multiple specialized receivers
3Reliability
If a unique identifier or code is used with remote control commands, then basic security is improved, but sophisticated unauthorized parties can co-opt the identifier for unauthorized use
Solution Approach 1:
The system implements periodic changes in both the code (rolling code) and the transmission characteristic for each message transmission. This periodic variation ensures that even if an unauthorized party captures one transmission, the parameters will have changed by the next transmission, rendering the captured data useless for future unauthorized access attempts
Solution Approach 2:
The security mechanism uses a composite approach by combining two security layers: the rolling code (logical security layer) and the transmission characteristic (physical layer security). This composite security structure is analogous to composite materials where the combination of different properties creates a system stronger than the individual components alone, making unauthorized access significantly more difficult
Data Source
AI summary
Upon providing (101) message content (such as a remote control instruction) to be transmitted, and in conjunction with provision (102) of a plurality of different transmission characteristics (as correspond, for example, to different types of transmission) and a corresponding plurality of correlated recovery identifiers (103), a particular transmission characteristic is selected (104) and used to transmit (105) a joint message. n particular, in a preferred approach, the selected transmission characteristic (106) is used when transmitting at least a portion of the message content portion of the joint message while another part of the joint message carries the recovery identifier to thereby facilitate selection of an appropriate reception technique by a receiver when receiving the joint message.