| 摘要 |
PROBLEM TO BE SOLVED: To increase the grade of terminals of the communication network in order to keep signals intact. SOLUTION: This net communication network is provided with a plurality of terminals (30, 34, 38) grouped into different security categories. Each terminal is provided with security elements (32, 36, 40), including security algorithm specific to a security category to which replaceable terminals are assigned. In the case of violation on a specific security version, a security element in a category receiving effect and replaced with a new element, having a different algorithm, can be replaced as required or periodically to keep the security of the system at a comparatively low cost. |
