METHOD AND SYSTEM FOR SECURELY REGISTERING CRYPTOGRAPHIC KEYS ON A PHYSICAL MEDIUM FOR CRYPTOGRAPHIC KEYS, AND PHYSICAL MEDIUM PRODUCED

摘要

The present invention relates to a method and a system for securely registering and storing cryptographic keys on a physical medium, and an associated physical medium, the method comprising the following steps: - using a first management entity (31), generating (1) a first pair of asymmetric cryptographic keys that comprise a fist public user key (pub1) and a first private user key (priv1), registering (2) the first private user key (priv1) on a physical medium, and affixing (4) a first indicator concealing element (hol1) on the physical medium to conceal the first private user key (priv1) and sealing it, said first private user key (priv1) being accessible only by visibly breaking the first indicator concealing element (hol1); - using the second management entity (32), generating (6) a second pair of asymmetrical cryptographic keys comprising a second public user key (pub2) and a second private user key (priv2), - registering (7) the second private user key (priv2) on the physical medium, affixing (9) a second indicator concealing element (hol2) on the physical medium to conceal the second private user key (priv2) and sealing it, the second private user key (priv2) being accessible only by visibly breaking the second indicator concealing element (hol2); - generating (10) at least one last public user key (pub0) and/or at least one cryptographic address (adr, adr-mult) using the first public user key (pub1) and the second public user key (pub2), registering (11) said at least one last public user key (pub0) and/or said at least one cryptographic address (adr, adr-mult) on the physical medium, and verifying (12, 13) same, and - finally recovering the private keys (priv1, priv2) comprising the generation of a last private user key (priv0) corresponding to the last public user key (pub0) and/or said at least one cryptographic address (adr, adr-mult).