| 摘要 |
<p>The apparatus (20) and a protected semiconductor (10) are placed opposite each other with communication points (30) between them. The piece is made with the ability to measure the various resistances across the resin (40) and to determine the encrypting key to be communicated to the protected semiconductor. The resistances are compared to establish a resistive key which may be used in combination with a secondary key held in a non-volatile memory of the protective piece. Alternatively, the piece has its own list of resistances which are the only ones of those measured that are used to determine the resistive key.</p> |
