| 摘要 |
<p>The invention relates to a data carrier comprising a semiconductor chip provided with at least one memory in which an operating program is stored. Said operating program contains a number of instructions, whereby each instruction is elicited by signals that can be detected outside of the semiconductor chip. The aim of the invention is to protect secret data, which is provided in the chip of the data carrier, from 'Differential Power Analysis' (DPA) or Higher Order DPA. To this end, the invention provides that in order to carry out security-relevant operations in the semiconductor chip, the data carrier is designed for dividing up secret data, which is stored or generated by the same, into at least three data parts, whereby an arithmetic unit for calculating a random number and for dividing the random number is contained therein, whereby the first data part is the integer result of the division, the second part is the remainder of the division, and the third part is the random number itself.</p> |
