Access and driving authorization system with increased security against relay attacks on the transponding interface

1. An authentication element including a keyless go device for a vehicle, the authentication element comprising:

a transponding interface for transmitting an authentication signal and for receiving power and data, and

a key button device for detecting user input,

wherein said authentication signal is transmitted over the transponding interface when the key button device detects user input; wherein:

the authentication element has a signal processing and forwarding device,

the signal processing and forwarding device is connected to the transponding interface and to the key button device,

the signal processing and forwarding device detects the user input of the key button device,

a predefined reference value is stored in the authentication element in the signal processing and forwarding device for comparison,

the signal processing and forwarding device transmits authentication signals over the transponding interface,

the authentication signals contain user input detected at the key button device.

2. The authentication element in accordance with claim 1 , wherein:

the key button device for detecting user input has an operating element, which is activated through pressing and then returned to its original position,

the signal processing and forwarding device is designed such that the detected user input is compared to the reference value,

when the comparison is positive, the signal processing and forwarding device transmits authentication signals over the transponding interface.

3. An authentication system for vehicles with at least one authentication element in accordance with claim 1 , comprising:

an apparatus, wherein:

the apparatus has a reading device for sending power and data as well as receiving authentication signals,

the transponding interface of the authentication element can be attached to the reading device for the apparatus in order to transmit authentication signals to the reading device after receiving power and data and

the apparatus is designed such that a function is activated after receiving transmitted authentication signals.

4. The authentication system in accordance with claim 3 wherein

the apparatus has a control system, specifically function logic for processing authentication signals that is connected to the reading device,

there are stored authentication signals for comparison stored in the apparatus, specifically in the function logic,

the received and stored authentication signals contain a user input detected by the key button device,

the function logic compares received authentication signals to stored authentication signals.

5. A process for checking an authentication request intended by a user on an authentication element of a vehicle with an authentication system in accordance with claim 3 whereby the process has the following steps:

arranging the authentication element in the transmitting and reception area of the reading device of the apparatus,

receiving power, whereby the transponding interface of the authentication element receives power from the reading device of the apparatus,

detecting the user input on the authentication element by the key button device,

generating authentication signals which include the detected user input,

transmitting the authentication signals from the authentication element to the apparatus, and

comparing the detected authentication signals with stored authentication signals in the apparatus.

6. The process of claim 5 , wherein:

the detection of the user input includes a detection by the signal processing and forwarding device of the authentication element,

the detection of the user input includes detecting that an operating element of the key button device has been pressed,

the reference value is stored in the signal processing and forwarding device of the authentication element,

the stored authentication signals are stored in the function logic of the apparatus,

in the event of a positive comparison, the detected user input is below or above the reference value or corresponds to the reference value,

if the comparison is positive, the detected authentication signals match the stored authentication signals.

7. The process of claim 5 , wherein:

the function logic compares the authentication signals of the authentication element to the stored authentication signals of the apparatus,

the signal processing and forwarding device is designed such that the detected user input is compared to the stored reference value,

the signal processing and forwarding device uses a wireless connection of the transponding interface and reading device to transmit authentication signals to the function logic of the apparatus,

the step of transmitting the authentication signals preferably includes encryption and/or compression of the authentication signals.

8. A process for checking an authentication request intended by a user on an authentication element of a vehicle with an authentication system in accordance with claim 3 whereby the process has the following steps:

arranging the authentication element in the transmitting and reception area of the reading device of the apparatus,

receiving power, whereby the transponding interface of the authentication element receives power from the reading device of the apparatus,

detecting the user input on the authentication element by the key button device,

comparing the detected user input in the authentication element with a reference value, whereby, when the comparison is positive, transmission of authentication signals is initiated from the authentication element to the apparatus.