| 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. Said representative of the authority (3) translates the transmitted messages and carries out the message verifications that have been decided by the authority. Said 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), whereby 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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