PROBLEM TO BE SOLVED: To provide a log recording device which makes confidentiality of user data compatible with a fault analyzability, a log recording method, a log decrypting device and a log decrypting method.;SOLUTION: A log recording device includes: CDB discrimination means for discriminating whether an SCSI request of inputted SCSI log data relates to user data due to CDB discrimination information regarding the SCSI log data; first encryption means for encrypting a portion including the user data in the SCSI request due to an encryption key regarding the SCSI request discriminated by the CDB discrimination means in a case where the SCSI request relates to the user data; and log output means by which, in a case where the SCSI request does not relate to the user data, the SCSI request discriminated by the CDB discrimination means and the SCSI request of which the portion including the user data is encrypted, from the first encryption means are shaped and outputted as a log file for analysis.;SELECTED DRAWING: Figure 1;COPYRIGHT: (C)2019,JPO&INPIT
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