Encrypted Radio Telegram Timing Key for Tire Pressure Monitoring
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Solution Overview
Problem
Current tire pressure monitoring systems use unencrypted radio transmission, making data vulnerable to interception and manipulation, which could lead to security risks, and existing encryption methods increase data transmission length, straining sensor batteries.
Innovation Solution
The method employs the time interval between telegram transmissions as a key, determined using a cryptological function based on system parameters like tire pressure, temperature, or rotational speed, ensuring encrypted data transmission without significantly lengthening the data packets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If encryption is applied to radio transmission data, then security against eavesdropping and manipulation is improved, but data transmission length increases, straining sensor battery capacity
Solution Approach 1:
The invention extracts the encryption key from the data payload and embeds it in the transmission timing interval instead. By taking the key information out of the data stream and placing it in the time domain, the data length remains unchanged while encryption security is maintained. The receiver uses the same timing interval to decrypt the data without requiring additional key transmission.
Solution Approach 2:
The invention moves the encryption key from the data dimension to the time dimension. Instead of embedding the key within the data packets, the key is encoded in the transmission timing interval between packets. This dimensional shift allows encryption to occur without increasing data transmission volume, thereby avoiding additional battery consumption.
2Reliability
If encryption keys are transmitted with data, then data security is improved, but transmission data volume increases, reducing battery service life
Solution Approach 1:
The encryption key is extracted from the data transmission stream and placed in the timing interval between transmissions. This extraction eliminates the need to attach additional key data to each packet, maintaining security while avoiding increased transmission volume that would reduce battery service life.
Solution Approach 2:
The transmission timing interval serves dual purposes: it controls the encryption/decryption process and simultaneously acts as the key itself. This self-service approach eliminates the need for separate key transmission, reducing overall data volume and extending battery service life while maintaining encryption security.
3Device complexity
If fixed transmission time frames are used, then system simplicity is maintained, but data security against manipulation is reduced
Solution Approach 1:
The invention introduces dynamic timing intervals between transmissions based on cryptological functions and system parameters. This dynamic approach maintains relative system simplicity while significantly improving data authenticity, as the variable timing acts as a security feature that prevents manipulation without requiring complex additional protocols.
Solution Approach 2:
The transmission timing parameter is changed from fixed to variable, governed by cryptological functions. This parameter change enhances data authenticity and security while maintaining system simplicity, as the timing variation itself becomes the security mechanism rather than requiring additional complex authentication protocols.
Data Source
AI summary
The invention relates to a method for the encrypted radio transmission of data in the form of telegrams spaced apart in time in a sequence between a transmitter and a receiver of a system, wherein the key can be changed and is derived from a current piece of information according to a cryptological method, such that the time elapsed between a preceding telegram and the encrypted telegram implementing the desired data transmission is used as the key, wherein said time span results from a value or entry of a parameter present in the system. The duration in the transmitter and the receiver can thereby be determined from a previously transmitted value or entry of a parameter, or derived only in the transmitter and wirelessly transmitted to the receiver for a future telegram. When using said method in a tire pressure monitoring system of a motor vehicle, wherein the data to be transmitted originate from a sensor provided in a vehicle tire and are wirelessly transmitted in an encrypted manner to a receiver provided on the vehicle body, the value or entry of the pressure determined by the sensor, for example, or the determined temperature in the tire, can be used for defining the time span, and that of the rotational speed of the tire, the tire contact force, the remaining service life of the battery provided in the tire, an identification number of the sensor, a time span used as a key in a preceding transmission step, or the like.