| 摘要 |
PURPOSE:To obtain appropriate security protection corresponding to a channel by acquiring the security level of the channel from a log-in request source to a log-in destination, and deciding the propriety of the execution of a command. CONSTITUTION:The security acquirement means 4 of the log-in destination transmits a signal inquiring the security level of the channel through a communication means 1, and transmits it to the log-in request source through a midway gateway (relay place). The respective gateways answer the security level of the channel to the next gateway to the log-in destination. The security acquirement means 4 of the log-in destination transmits the lowest level among the transmitted security levels to an execution control means 5 as the security level of the channel. The execution control means 5 compares the security level requested for the execution of the command with the security level of the channel, which is transmitted from the security acquirement means 4, and the execution of the command is permitted or the execution of the command is inhibited. |
