| 摘要 |
In order to secure messages that are exchanged in a data transmission network between a server ( 1 ) and a client ( 2 ), a control device that is decentralized or represents the authority ( 3 ) is permanently inserted into the network between the server ( 1 ) and the user ( 2 ) during the secured exchange of messages. The representative of the authority ( 3 ) translated the transmitted messages and carries out the message verifications that have been decided by the authority. The representative of the authority ( 3 ) can be a specific microprocessor card, for example, which is permanently inserted between the server ( 1 ) and the client ( 2 ), so that the authority does not need to be directly involved in the transactions and no permanent connection with the authority is required.
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