PROBLEM TO BE SOLVED: To acquire information on the safety of an information processing system without presenting information on a specific configuration of the information processing system. SOLUTION: The audit system 100 is implemented in an information processing system including a device to be investigated and a totaling device, and an information acquisition unit 110 obtains system information related to a predetermined item as information on the safety of the device. Acquired from the device to be investigated, the information processing unit 120 converts the acquired system information into information indicating the security level and encrypts it under the analysis prevention environment, and the output control unit 140 converts the encrypted information and this information. Output the plain text of the information. [Selection diagram] Fig. 2
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