Patent ID: 6892301

Claim:
A method for securely handling an information unit by a first information processing device ( 2 ) interoperating with a second secure information processing device ( 1 ), whereby the information unit is provided by an issuer, the method comprising the steps: transmitting ( 3 , 25 , 35 ) the information unit, from the first issuer to the first information processing device ( 2 ), the information unit being processed by a cryptographic process; providing at least one key for the cryptographic process on the second secure information processing device ( 1 ); the first information processing device (i) receiving the at least one key from the second information processing device, and (ii) cryptographically reprocessing ( 29 , 38 ) the information unit by using the at least one key; providing ( 3 , 25 , 35 ) the information unit from the issuer to the first information processing device ( 2 ), the information unit being encrypted by using at least a first key; providing the first key from the issuer to the first information processing device ( 2 ), the first key being encrypted by using at least a second key; providing the at least one second key on the second secure information processing device ( 1 ); and wherein at least a third key is provided for external authentication and/or release control of the respective information unit.