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The present invention relates to a transaction method between a secure processor and a transaction server, via a non-secure processor or a non-secure link, connected to a routing con troller, the method including steps of the controller transmit ting to the secure processor, a command message sent by the non-secure processor or by the non-secure link, the controller receiving a response message sent by the secure processor, and the controller transmitting the response message to the non-secure processor or via the non-secure link, the controller analyzing the content of the response message so as to detect data of a first type therein, and removing detected data of the first type from the response message before transmitting it to the non-secure processor or via the non-secure link.