TRANSMISSION NODE, RECEPTION NODE, COMMUNICATION NETWORK SYSTEM, MESSAGE CREATION METHOD, AND COMPUTER PROGRAM

摘要

PROBLEM TO BE SOLVED: To improve message inspection performance in a communication network system in which a transmission node is connected with a reception node.SOLUTION: A transmission node comprises: a transmission unit 111 that divides input transmission data into multiple pieces of sub-transmission data, and stores the sub-transmission data in a data part in a message separately transmitting each of a plurality of sets of a piece of sub-transmission data and a message authentication code (MAC) generated using the piece of sub-transmission data; and a message authentication code generation unit 114 that generates, by using a piece of sub-transmission data, a message authentication code stored in a data part in a message transmitting the message authentication code together with the piece of sub-transmission data.