Method for cryptographic authentication
AssigneeNXP B.V.
InventorsJuergen Nowottnick, Frank Boeh
Life of this patent
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Abstract
The invention relates to a method for cryptographic authentication in access security systems. The aim of the invention is to provide a software solution. To this end, the method for secured storage of counter states in a non-volatile memory (EEPROM) (10) involves an incrementing (11) process, and the current counter state is updated in only one EEPROM segment following each incrementing process (11), a subsequent access to the EEPROM (10) only being enabled in the event of a successful incrementing (11) of an EEPROM-based counter.
Claims7
A method for cryptographic authentication in access security systems in which for a secured storing of counts in a non-volatile memory (EEPROM) an incrementation is performed and after each incrementation the current count is updated in not more than one EEPROM segment, where a subsequent access to the EEPROM takes place only in the event of a successful incrementation of an EEPROM-based counter.
Dependencies are inferred from the claim text.