| 摘要 |
An agent program 141 stores a log file in a storage device 150 . By controlling an access to the storage device 150 according to volume management information 153 , the storage device 150 prevents the log file from being updated. A manager program 142 communicates with the agent program 141 to collect the log file. On the completion of the log collection, the manager program 142 adds a signature to a log deletion message by use of a security chip 105 . Then, the agent program 141 verifies the signature by use of a security chip 104 to judge that a log deletion request is valid. After that, the volume management information 153 which has been used to protect the log file is rewritten so that the protection is removed.
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