Patent ID: 8887997

Claim:
A method for the securing of a payment transaction effected by means of a payment card, wherein the transaction involves a communication with a conventional payment authorization center, and which can be effected only when authorization is given by the said center, the method including the use of an activation server in communications with the payment authorization center and in which is stored, in association with each payment card, an activation identifier, and the following steps: when a payment with a payment card is envisioned, establishment of a phone communication with the activation server on the initiative of the card owner with a mobile telephone device of said owner, and the provision to the server of an identifier obtained or generated independently of the card itself and aiming to temporarily activate the payment card for a limited period, the activation identifier consisting of the calling number of said telephone device of the owner and wherein the authentication is made by identifying the calling number of the telephone device of the owner, at the activation server, if the identifier received matches the stored activation identifier, automatic temporary activation of the payment card for the said limited period, in response to said matching, and then automatic deactivation of the payment card, after the limited period has elapsed, during a subsequent conventional transaction with the payment card, establishment of a Communication between the conventional payment authorization center and the activation server, with the authorization center delivering an authorization only if the temporary activation of the payment card is still valid.