| 摘要 |
PROBLEM TO BE SOLVED: To improve reliability of a server device regarding certification of unfalsification.SOLUTION: A hash value log transmitting/receiving section 371 stores a hash value received from a maintenance server 100 as a hash value log and further calculates a hash value in unit of, for example, n (n is a natural number) value logs. The hash value log transmitting/receiving section 371 transmits to an H-EMA (Hyper-Environment Management Authority) server 400 a hash value based on the collected n hash value logs. A program execution monitoring section 375 acquires an operation log accompanying execution of all programs operating in a P-EMA (Private-Environment Management Authority) server 300. For each operation log including identification information of a program, operation contents and an operation date accompanying execution of the program, the program execution monitoring section 375 calculates a hash value based on the operation log. The program execution monitoring section 375 transmits each hash value based on each operation log to the H-EMA server 400. |
