Configure auditing and logging
For optimum security go to Log & Report > Log Settings enable Event Logging. For best results send log messages to FortiAnalyzer or FortiCloud.
From FortiAnalyzer or FortiCloud, you can view reports or system event log messages to look for system events that may indicate potential problems. You can also view system events by going to FortiView > System Events.
Establish an auditing schedule to routinely inspect logs for signs of intrusion and probing.
Encrypt logs sent to FortiAnalyzer/FortiManager
To keep information in log messages sent to FortiAnalyzer private, go to Log & Report > Log Settings and when you configure Remote Logging to FortiAnalyzer/FortiManager select Encrypt log transmission.
From the CLI.
config log {fortianalyzer | fortianalyzer2 | fortianalyzer3} setting
set enc-algorithm high
end