Vehicle security device with electronic use authorization coding
First Claim
1. Vehicle security device having an electronic use-authorization coding arrangement, comprising:
- a user-end key unit for successively transmitting items of user code information which differ from one another;
a vehicle-end apparatus for receiving the transmitted user code information, and generating as a function thereof an item of actual authorization information; and
means for comparing said item of actual authorization information with an item of desired authorization information present at the vehicle end, and for generating an item of use-enabling information based on a result of said comparing;
whereinsaid successively transmitted user code information comprises an inverse image for a one-way function;
the desired authorization is in each case a one-way function value associated with the inverse image contained in said item of user code information; and
the determination of the actual authorization information from the received user code information includes the formation of the one-way function value associated with the inverse image contained in the received user code information.
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Accused Products
Abstract
The invention provides a vehicle security device with an electronic use-authorization coding arrangement for identifying authorized access to the vehicle. The vehicle security device utilizes an encryption method which operates on the basis of a one-way function, so that it is only absolutely necessary to store secret code information at the key end, specifically in the form of different inverse images of a one-way function. Only the one-way function values corresponding to these inverse images need be present at the vehicle end, a reading-out of which does not permit unauthorized manufacture of a copied key because of the virtual irreversibility of the one-way function.
50 Citations
10 Claims
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1. Vehicle security device having an electronic use-authorization coding arrangement, comprising:
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a user-end key unit for successively transmitting items of user code information which differ from one another; a vehicle-end apparatus for receiving the transmitted user code information, and generating as a function thereof an item of actual authorization information; and means for comparing said item of actual authorization information with an item of desired authorization information present at the vehicle end, and for generating an item of use-enabling information based on a result of said comparing;
whereinsaid successively transmitted user code information comprises an inverse image for a one-way function; the desired authorization is in each case a one-way function value associated with the inverse image contained in said item of user code information; and the determination of the actual authorization information from the received user code information includes the formation of the one-way function value associated with the inverse image contained in the received user code information. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification