| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that, when applying an encryption technology to a control system in which processing is performed periodically and an execution cycle is short, since speed requirement to encryption is made severe because of short-cycle processing, optimal partial encryption meeting a performance requirement cannot be selected.SOLUTION: Means for protecting communication between a transmission control device and a reception control device by means of partial encryption processing is provided. The transmission control device converts plaintext data by performing partial encryption processing while using encryption setting information corresponding to a transmission destination, and creates data for transmission. An encryption header included in the data for transmission includes filter information designating an encryption subjected part and a non-subjected part, and a size of the filter information is appropriately set, thereby dealing with short-cycle processing (requirement of high-speed performance as encryption) in a control system. |
