Importance

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Abstract

In a system for transporting bank notes between system terminals in a container for valuables, referred to as a cassette, each cassette is provided with an electronic unit or sealing provision. The electronic unit includes a counter (131) and a memory (13). The counter (131) registers a new count each time the cassette is opened. The cassettes can be connected both mechanically and electrically to any of the terminals. An electronic unit in a terminal includes a processor (20), a coding unit (21), a decoding unit (22) and a comparator (23). Before disconnecting a cassette from a terminal, the count of the counter (131) is read by the terminal and is encoded with the respective coding unit (21). The coded value corresponding to the count is then stored in the memory (13) of the cassette. At a second terminal the counter setting and its coded value stored in the memory (13) are read. The coded value is decoded by the decoding unit (22) of the second terminal and is compared to the counter setting by the comparator (23). An agreement between the compared values show that the cassette was not opened in transit. Conversely, an opening in transit occurred if the two compared values do not coincide. During transit the memory (13) contains both the counter setting and its coded value. However, these two values can only be compared when the correct decoding algorithm is known.

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First Claim