| 摘要 |
<p>The key distribution system is equipped with terminals (10), which engage in encrypted communications with one another using a secret communication key (K10) as a common key, and a server (20). When requesting that a new secret communication key (K11) be issued, a terminal (10) generates a secret value (R10), encrypts it using a public key, and sends it to the server (20). The server (20) encrypts the encrypted secret value (R10) using a private key that is paired with the public key. The server (20) issues a new secret communication key (K11), encrypts it using the secret value (R10) as a common key, and transmits it to the terminal (10). The terminal (10) decodes the encrypted new secret communication key (K11) using the secret value (R10) in order to obtain the new secret communication key (K11). The terminal (10) and the server (20) subsequently engage in encrypted communication with each other using the new secret communication key (K11) as a common key.</p> |
