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Method for a secure data transmission

  • US 20070113071A1
  • Filed: 06/02/2005
  • Published: 05/17/2007
  • Est. Priority Date: 08/03/2004
  • Status: Abandoned Application
First Claim
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1. A method for secure data transmission between a first subscriber and second subscribers, the first subscriber being a tachograph in a commercial vehicle and the second subscriber being memory cards having at least one respective data store, wherein the first subscriber has a memory which stores a particular number of entries each comprising identifiers and associated security certificates from second subscribers with a detection time for the security certificate, the method comprising the steps of:

  • fetching an identifier by the first subscriber from the second subscribers, comparing by first subscriber the identifier with the identifiers stored in the memory, if a matching identifier is present, prompting the security certificate associated with the identifier to be a basis for a subsequent data transmission and updating the detection time for the security certificate to a current system time, and if no matching identifier is stored in the memory, prompting the first subscriber to perform security certificate verification with the second subscriber and, in the event of verification, storing an entry corresponding to the verified security certificate with a current detection time in the memory, with the entry with the oldest detection date being replaced by the new entry if a particular number of entries has already been reached.

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