Method and system for providing a plurality of tamperproof digital certificates for a plurality of public keys of a device

A device for providing a plurality of tamperproof digital certificates for a plurality of public keys, comprising:

• a storage unit configured to store a plurality of key pairs each with a public key and an associated private key;
• a requesting unit configured to respectively create a signing request for requesting a digital certificate for each of a plurality of public keys and to sign a signing request for the ith public key using a jth private key for all public keys in accordance with a signing rule, the jth private key being dissimilar to an ith private key belonging to an ith public key;
• and
• a transmitting unit configured to transmit all signing requests to the same certification authority in each case;
• wherein a respective digital certificate for all of the plurality of public keys is received by the device if all signing requests have been positively verified.

A certification authority for providing a plurality of tamperproof digital certificates for a plurality of public keys of a device, comprising:

• a receiving unit configured to respectively receive a signing request for requesting a digital certificate for each of a plurality of public keys from a device;
• a storage unit configured to store at least one signing rule, the signing rule indicating that a signing request for an ith public key is signed using a jth private key for all M public keys, the jth private key being dissimilar to the ith private key belonging to the ith public key;
• a certification unit configured to check a signing request message to determine whether it has been signed in accordance with the signing rule;
• and
• an issuing unit configured to respectively issue a digital certificate for all of the plurality of public keys if all signing request messages are positively verified.

A system for providing a plurality of digital certificates for a plurality of public keys of a device, the system comprising:

• a device for providing a tamperproof plurality of digital certificates for a plurality of public keys, the device comprising:
• a storage unit configured to store a plurality of key pairs each with a public key and an associated private key;
• a requesting unit configured to respectively create a signing request for requesting a digital certificate for each of a plurality of public keys and to sign a signing request for the ith public key using a jth private key for all M public keys in accordance with a signing rule, the jth private key being dissimilar to an ith private key belonging to an ith public key;
• and
• a transmitting unit configured to transmit all signing requests to the same certification authority in each case;
• and
• a certification authority for providing the plurality of tamperproof digital certificates for the plurality of public keys of the device, the certification authority comprising:
• a receiving unit configured to respectively receive the signing request for requesting the digital certificate for each of the plurality of public keys from the device;
• a storage unit configured to store at least one signing rule, the signing rule indicating that a signing request for an ith public key is signed using a jth private key for all M public keys, the jth private key being dissimilar to the ith private key belonging to the ith public key;
• a certification unit configured to check a signing request message to determine whether it has been signed in accordance with the signing rule;
• and
• an issuing unit configured to respectively issue a digital certificate for all of the plurality of public keys if all signing request messages are positively verified.