Patent ID: 8861726

Claim:
A method for generating cryptographic half-keys, comprising: generating n pairs (K i 1 , K i 2 ), 1 ≦i≦n, of cryptographic half-keys operative to allow n different users to access a secure apparatus, each of said pairs operative to reconstruct an access key K PL specific to the secure apparatus; generating a first series of said n half-keys K i 1 ; storing, with the help of a management center distinct from said secure apparatus, said first series of said n half-keys K i 1 on a plurality of non-transitory recording mediums, wherein the management center is a computer linked to a bank of connectors operative to the connection of a non-transitory medium storing a half-key K i 1 said computer being provided with software for generating half-keys; wherein each medium of said plurality of recording mediums stores one or more half-keys K i 1 being allocated to a group of said users of the secure apparatus, further comprising a step of defining access rights in respect of each of said mediums, via a graphical interface installed on the management center; recording an identifier of the secure device to which the management center allows access and a half-key K i 1 associated with the secure device; connecting a file injection device to the secure apparatus, said file injection device receiving a transmission from the recording medium with the first series of said n half-keys K i 1 ; producing a second series of n half-keys K i 2 based upon the access key K PL and based upon the first series of said n half-keys K i 1 contained in the file injection device, for storage on the secure apparatus; and reconstructing the access key K PL specific to the secure apparatus when a user connects to the secure apparatus, wherein a file of commands is produced by the management center, said file of commands being stored on the recording medium, said file containing instructions to be read by the secure apparatus to command a generation of the second series of half-keys K i 2 by the secure apparatus.