A method for generating cryptographic half-keys makes it possible to generate n pairs (Ki1, Ki2), 1≦i≦n, of cryptographic half-keys, each of said pairs making it possible to reconstruct an access key KPL specific to a secure apparatus, said method comprising at least the following steps: generating and storing, with the help of a management center distinct from said apparatus, a first series of n half-keys Ki1 on a recording medium; supplying the apparatus with said recording medium so as to generate, with the help of said local key KPL and of the n half-keys Ki1 stored on said medium, a second series of n half-keys Ki2 making it possible to form said n pairs (Ki1, Ki2). The method applies notably to the creation of several keys for access to a secure apparatus.