| 摘要 |
A method enabling two populations of persons, one being sedentary (for examp le a provider of long-distance services) and the other being nomadic (for example the customers of this provider of services) to exchange data in a sure and speed y manner, comprises the following steps: - portable objects are placed at the disposal of the persons belonging to th e nomadic population, these objects having the credit card format and being customized by specific identifiers for each person and for each card, the card is used to transmit at least partially encrypted DTMF type brief acoustic identification signals which are received by means of the microphone of a standard telephone set and processed by means of the standard telephone set so that the resulting signal can be transmitted, through a telephone or computer network, to the data-processing service of at least one of the persons of the sedentary population, - the signals coming from the card are processed by means of a specific software program whose parameters are a function of the characteristics of the card, its conditions of use in combination with the microphone of the telephone set, characteristics of the communications network for signals of a particular type corresponding to the identification data transmitted, - the signals are decrypted and the data elements obtained after decryption are compared with the data elements, in the possession of the data-processing service, for the identification of the card and the holder of the card.
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