Method for the Encrypted Radio Transmission of Data
First Claim
1. A method for encrypted radio transmission of data between a transmitter and a receiver of a system, the method comprising the acts of:
- transmitting encrypted short telegrams mutually spaced apart in time, wherein an encryption key is changeable; and
using an elapsed time period between a preceding telegram and the encrypted telegram transmitting the data as the encryption key, said time period being a result of a value or an amount of a parameter present in the system.
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Accused Products
Abstract
A method is provided for encrypted radio transmission of data telegrams spaced apart in time in a sequence between a transmitter and a receiver of a system, wherein a key is changeable and is cryptologically derived from a current piece of information. The time elapsed between a preceding telegram and the encrypted telegram implementing the desired data transmission is used as the key. The time span results from a value or entry of a parameter present in the system. The duration in the transmitter and the receiver is determinable 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. In a motor vehicle tire pressure monitoring system, the transmitted data originate from a tire sensor and are wirelessly transmitted in an encrypted manner to a vehicle body.
29 Citations
10 Claims
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1. A method for encrypted radio transmission of data between a transmitter and a receiver of a system, the method comprising the acts of:
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transmitting encrypted short telegrams mutually spaced apart in time, wherein an encryption key is changeable; and using an elapsed time period between a preceding telegram and the encrypted telegram transmitting the data as the encryption key, said time period being a result of a value or an amount of a parameter present in the system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification