| 摘要 |
The invention concerns a method for preauthentication of a first entity (10) by a second entity (1) communicating with each other through a wireless link, including the following steps: the second entity (1) emits (23') a challenge value (c); if the first entity (10) receives (23) a challenge value (c') it applies to the received challenge value a predefined transformation (g) known to the second entity, to obtain a first transformed value (r), then emits (24) the first transformed value obtained; and if the second entity receives (24') a transformed value (r') it compares (25') the received transformed value to a second transformed value (r'') obtained by applying the predefined transformation (g) to the emitted challenge value, and estimates the preauthentication to be successful if the result of the comparison between the second transformed value obtained and the received transformed value is less than a predefined threshold (m).
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