Method for protecting a cryptographic device against spa, dpa and time attacks

A method of operating a cryptographic device to reduce effects of power analysis attacks, the method comprising:

• executing a first set of cryptographic algorithm computations with a first crypto-processor of the cryptographic device, the first set of cryptographic algorithm computations providing encryption of a first set of data to be protected with a first secret key;
• and
• executing a second set of cryptographic algorithm computations with at least one second crypto-processor of the cryptographic device for providing encryption of a second set of data different from the first set of data to be protected with a second different secret key.

An integrated circuit (IC) card to be inserted into a cryptographic device, the IC Card comprising:

• a first cypto-processor configured to execute a first set of cryptographic algorithm computations for providing encryption of a first set of data to be protected with a first secret key;
• and
• at least one second crypto-processor configured to execute a second set of cryptographic algorithm computations for providing encryption of a second set of data different from the first set of data to be protected with a second different secret key.

A circuit on an integrated circuit (IC) card to be inserted into a cryptographic device, the circuit comprising:

• a first cypto-processor configured to execute a first set of cryptographic algorithm computations for providing encryption of a first set of data to be protected with a first secret key;
• and
• at least one second crypto-processor configured to execute a second set of cryptographic algorithm computations for providing encryption of a second set of data different from the first set of data to be protected with a second different secret key.