AUDIT PROGRAM, AUDIT SYSTEM AND AUDIT METHOD

摘要

An audit device (20) of an audit system (1) receives hashed logs in which logs on other customers are hashed by a unidirectional function and an entire log (management log (customer A) of an example in Fig. 1) including a log of a customer herself or himself from a log saving server (13) of a center (10). Further, the center (10) connects all the management logs and the audit device (20) hashes the log of the customer herself or himself out of the received logs, makes out an entirely hashed management log (management log (customer A: hashed value) of the example in Fig. 1) and receives a wholly hashed management log (management log (customer A: hashed value) of the example in Fig. 1) from a hashed log publicly disclosing server of the center (10). The audit device (20) compares the management log (customer A: hashed value) hashed by herself or himself with the received log (hashed) to verify the legitimacy of the log.