METHOD AND DEVICE FOR UPDATING A SEED ESTABLISHED BY A DETERMINISTIC FUNCTION IN A DIGITAL PROCESSING COMMUNICATIONS DEVICE

摘要

The invention relates to method for updating a seed, comprising the following steps: determining the valid seeds among a number of seeds by means of respective writing validity indicators (101, 102, 104); selecting a first seed among the valid seeds by means of a deterministic function (105); reading the first seed into a non-volatile memory (121); generating a second seed by the function applied to the first seed (122); generating an indicator associated with the second seed (123), and; writing the second seed and the indicator in a single operation into a non-volatile memory while preserving the value of the first seed (124). The invention makes it possible to reduce the time for updating the seed for contactless applications.