| 摘要 |
<p>A secure circuit structure includes a pair of opposed substrates (2, 4) having a volatile circuit (6a, 6b) fabricated on at least one, and perferably both substrates (2, 4). A maintenance circuit (12-26, A-E) for the volatile circuit (6a, 6b) extends between the substrates (2, 4) so that it is interrupted, thereby altering the volatile circuit (6a, 6b) and rendering reverse engineering attempts futile, if the substrates (2, 4) are moved with respect to each other by opening the circuit package. The maintenance circuit (12-26, A-E) preferably includes a series of mating conductive indium bumps (12, 14, A-E) that extend from the opposed substrates (2, 4) and mechanically bond the substrates (2, 4) together. The secured volatile circuit (6a, 6b) may be a random access memory storing an access code, maintained by a battery power supply circuit. <IMAGE></p> |
