| 摘要 |
A method of authenticating a carrier of a portable object comprising means of memorising at least one item of secret information, comprising the following steps: authentication processing of a signature provided by the carrier, taking account of the secret information; supply of an item of information for the authentication decision, positive or negative; implementing, in a non volatile memory of the portable object, an incorrect signature indicator that may adopt a value indicating a normal situation and at least one value indicating an abnormal situation, and comprising: after the information supply step, a step for writing, in the incorrect signature indicator, a value indicating an abnormal situation, if the authentication decision is negative; and, before the authentication step, if the incorrect signature indicator contains a value indicating an abnormal situation, a step generating a delay. The writing step also comprises an operation for memorising at least one item of context-related information, such as the date and time and/or an identifier of the terminal used.
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