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US 2001/0040966 A1Published application
Method of and system for writing-in key information
OwnerWolfgang Buhr, Helmut Hornerinventors
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OwnerWolfgang Buhr, Helmut Hornerinventors
Estimating the term…
In the case of keys which cooperate electronically with an object, for example a motor vehicle, it is often necessary to produce a new key. These keys must be available rapidly at remote locations, so that the object-specific key information must be transmitted and written into the key in a secure manner. For this purpose, according to the invention, object information is transmitted from the remote station to a central station, which reads out the key information stored for this purpose and encrypts it with identification information stored both in the central station and in the key and transmits this to the key. By means of the secret identification information stored therein the key is capable of recovering and storing the original key information. Moreover, prior to the transmission to the central station, the object information is encrypted with further readable identification information, which has also been stored in the key and in the central station and by means of which the secret identification information is read out for the purpose of decryption in the central station. The encrypted object information can be encrypted additionally, for example by means of an asymmetrical encryption algorithm.
A method of writing key information transmitted securely from a central station to a remote station into a data carrier available at said remote station, which after writing-in is unambiguously allocated to a selected one of a plurality of objects through the key information and which stores identification information which is not externally readable as well as open further identification information which can be read out, which types of identification information are also stored, allocated to one another, in the central station, object information which is characteristic of the individual object as well as the open further identification information being subsequently transmitted to the central station, where the key information which has been stored for the object information is read out and encrypted with the identification information stored allocated to the transmitted further identification information and the encrypted key information is transmitted to the data carrier and, in the data carrier, it is decrypted by means of the identification information stored therein and the decrypted key information is stored.
A system for writing key information transmitted securely from a central station to a remote station into a data carrier available at said remote station, which after writing-in is unambiguously allocated to a selected one of a plurality of objects through the key information, the central station comprising a first memory which stores at least one identification information and associated further identification information, as well as object information characteristic of the object for each of the plurality of objects and the key information associated with the object, and an encryption device for encrypting key information read from the first memory with the identification information and a transmission device for transmitting the encrypted key information to the remote station, and the data carrier comprising a second memory and a decryption device, which second memory comprises a first storage location for identification information, a second storage location for key information, and a third storage location for further identification information characteristic of the data carrier, and which decryption device is connected to an information input of the data carrier and to the first storage location in order to supply decrypted key information and write this into the second storage location after having received encrypted key information.
Dependencies are inferred from the claim text.