Importance

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Abstract

A transmitter-receiver system (FIGS. 1 and 2), which checks the authorization to use an object (O), contains a transmitter (S), which has a transmitting element (SE) as well as one or more transmitter operator control elements (SB), which for their part can trigger the transmitting of coded signals (SI), the code concerning authorization to use the object (O). The transmitter (S) has at least a single transmitter memory (SS) for the storage of data on use authorizations. The receiver (E) has a receiving element (EE), which receives the coded signals transmitted to it, and a receiver memory (ES) for the storage of data for determining the authorization of codes (SI) received, and also a logic circuit (.mu.P), which checks the respectively received code (SI) by means of the data stored in the receiver memory (ES) and, depending on the result of the check actuates a mechanism (ST). For (re-)initialization, the transmitter (S) contains for preparation of a new future code/set of codes (SI) a random generator (Z), which generates a random number (B) by actuation of at least one of the transmitter operator control elements (SB). The transmitter (S) transmits to the receiver (E) an original code (UC) without any dialog taking place automatically and bidirectionally between the transmitter (S) and the receiver (E).

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First Claim