| 摘要 |
The present invention relates to an apparatus (1) comprising: an inlet (2) for receiving an input, an outlet (3) for forwarding a response, and calculating means (P). In order to ensure that no information will become known to an external attacker while the secret key is being handled, the apparatus (1) comprises a memory (M) with contributory factors of the secret key stored therein such that a sum of said contributory factors corresponds to a value of the secret key, at least one of said contributory factors consisting of numbers to be multiplied with each other, said contributory factor consisting of numbers to be multiplied with each other being stored in the memory as separate numbers. |
