Method and system for securely enrolling cryptographic keys on physical media for cryptographic keys, and physical media product

摘要

The present invention relates to a method and system for registering and securely storing cryptographic keys on a physical medium, and an associated physical medium, the method comprising the following steps: from a first management entity (31) generating (1) a first pair of asymmetric cryptographic keys comprising a first public user key (pub1) and a first private user key (priv1), I registering (2) the first private user key (priv1) on a physical medium, and the apposition (4) of a first control blanking element (hol1) on the physical medium to conceal the first private key user (priv1) and seal it, said first private key user (priv1) not being accessible only by visible rupture of said first control blanking element (hol1); from the second management entity (32), the generation (6) of a second asymmetric cryptographic key pair comprising a second public user key (pub2) and a second private user key (priv2), -the registration (7) of the second private user key (priv2) on the physical medium, the apposition (9) of a second blanking control element (hol2) on the physical medium to conceal the second private key user (priv2) and seal it said second private user key (priv2) being accessible only by visible breaking of said second control blanking element (hol2); the generation (10) of at least one last public user key (pubO) and / or at least one cryptographic address (adr, adr-mult) from the first public user key (pub1) and the second public key user (pub2), - the registration (11) of said at least one last public user key (pubO) and / or of said at least one cryptographic address (adr, adr-mult) on the physical medium, and the verification (12,13) thereof, and - the final recovery of private keys (priv1, priv2) comprising the generation of a last private key user (privO) corresponding to the last public key user (pubO) and / or at said at least one cryptographic address (adr, adr-mult).