METHOD FOR THE SAFE TRANSFER OF DATA

The present invention relates to a method and a system for the safe transfer of data between at least two computer devices. In first aspect, the invention to this end provides a method for performing an electronic transaction between a mobile communication device of a buyer, a terminal of a merchant and a transaction server which is connected to the terminal, which mobile communication device, the terminal and the transaction server are comprised in a data network, the method comprising the following steps: the mobile communication device initiates a communication session with the transaction server via the terminal; the transaction server of the mobile communication device receives an identification code which is linked to the buyer; the transaction server initiates a communication session with a trusted third party; the transaction server retrieves buyer-identification information and transaction data from the trusted third party in order to perform the electronic transaction between the buyer and merchant; the transaction server authenticates the buyer on the basis of the received buyer-identification information; the transaction server processes the electronic transaction between the buyer and merchant; furthermore comprising the following steps: the mobile communication device transmits an expiration parameter to define a life span of the buyer-identification information on the transaction server together with the identification code to the transaction server; the transaction server automatically removes the buyer-identification information after the life span of the transaction server determined by the expiration parameter has expired.