Patent ID: 8923514

Claim:
An arrangement for monitoring of authentication, in particular for motor vehicles, comprising: a first communication apparatus and at least a second communication apparatus, between which a wireless communication channel can be set up, the first and second communication apparatuses each having an authentication element and an encryption element, with which exchangeable data is encrypted via the wireless communication channel; each of the first and second communication apparatuses having a memory in which a dynamic digital key used for authentication and encryption is stored; and at least one piece of information regarding at least one past communication between the first communication apparatus and the second communication apparatus being stored in at least one of the first or second communication apparatuses, wherein said at least one piece of information is separate from authentication data and includes at least one of a time and date of at least one past communication; and wherein the first communication apparatus modifies the dynamic digital key based on the at least one piece of information and transmits the modified dynamic digital key to the second communication apparatus for use in a subsequent communication; wherein said modified dynamic digital key is stored in said memory of each of said first and second communication apparatuses for use in subsequent authentication and encryption.