| 摘要 |
<p>PROBLEM TO BE SOLVED: To improve safety against an association key attack to an arbitrary circuit without the self-destruction of the circuit.SOLUTION: At safety enhancement, a safety enhancement device obtains and outputs auxiliary information having specific correspondence with secret information corresponding to key information. Here, it is difficult to identify, from the auxiliary information, associative auxiliary information having the above correspondence with associative secret information different from the secret information. At verification, the safety enhancement device determines whether the input auxiliary information has specific correspondence with the secret information. When the auxiliary information has the correspondence with the secret information, the safety enhancement device obtains key information corresponding to the secret information or information obtained from the key information, whereas when the auxiliary information has no correspondence with the secret information, the safety enhancement device outputs information representing rejection.</p> |
