Navigation installation and method for extracting information transmitted in encrypted form
First Claim
1. A method for extracting traffic information data from traffic information in encrypted form in_broadcast radio signals, comprising:
- providing a storage medium, having a writable portion for storing data, and having a structure unalterably storing a storage medium serial number formed in the manufacture of the storage medium;
providing a navigation unit having a radio receiver for receiving the broadcast radio signals and a reader for reading the writable portion of the storage medium and for reading the structure unalterably storing a storage medium serial number formed in the manufacture of the storage medium;
arranging said storage medium with said navigational unit;
reading said storage medium serial number from said storage medium, at the navigational unit;
inputting a given license number data to the navigational unit;
generating an access code, at the navigational unit, based on said reads storage medium number and said input license number;
determining whether or not said generated access code meets a given access code admissibility criterion; and
extracting the traffic information data from the encrypted traffic information if said determining determines the access code admissibility criterion is met, else not extracting the traffic information data.
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Accused Products
Abstract
A navigation unit having a data decryption algorithm is connected to a data storage and reading unit having a storage medium storing map data, the data storage and reading unit having a nonalterable access number, and the navigation unit connects to a broadcast radio receiver. The navigation unit receives, through the broadcast radio receiver, broadcast radio signals having encrypted information. The navigation unit reads the nonalterable access number, processes the number through a hash algorithm, and compares the processed access number to another access number to decrypt the encrypted information.
9 Citations
3 Claims
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1. A method for extracting traffic information data from traffic information in encrypted form in_broadcast radio signals, comprising:
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providing a storage medium, having a writable portion for storing data, and having a structure unalterably storing a storage medium serial number formed in the manufacture of the storage medium; providing a navigation unit having a radio receiver for receiving the broadcast radio signals and a reader for reading the writable portion of the storage medium and for reading the structure unalterably storing a storage medium serial number formed in the manufacture of the storage medium; arranging said storage medium with said navigational unit; reading said storage medium serial number from said storage medium, at the navigational unit; inputting a given license number data to the navigational unit; generating an access code, at the navigational unit, based on said reads storage medium number and said input license number; determining whether or not said generated access code meets a given access code admissibility criterion; and extracting the traffic information data from the encrypted traffic information if said determining determines the access code admissibility criterion is met, else not extracting the traffic information data. - View Dependent Claims (2, 3)
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Specification