Cisco Cisco Email Security Appliance C170 사용자 가이드
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User Guide for AsyncOS 10.0 for Cisco Email Security Appliances
Chapter 9 Using Message Filters to Enforce Email Policies
Attachment Scanning
Configuring the Image Analysis Scanning Engine
To enable image analysis from the GUI:
Procedure
Step 1
Go to Security Services > IronPort Image Analysis.
Step 2
Click Enable.
A success message displays, and the verdict settings display.
The image analysis filter rule allows you to determine the actions to take based on the following verdicts:
•
Clean: The image is free of inappropriate content. The image analysis verdict is computed on the
message as a whole, so a message without any images will receive a "clean" verdict if scanned.
message as a whole, so a message without any images will receive a "clean" verdict if scanned.
•
Suspect: The image may contain inappropriate content.
•
Inappropriate: The image contains inappropriate content.
These verdicts represent a numeric value assigned by the image analyzer algorithm to determine
probability of inappropriate content.
probability of inappropriate content.
The following values are recommended:
•
Clean: 0 to 49
•
Suspect: 50 to 74
•
Inappropriate: 75 to 100
You can fine-tune image scanning by configuring the sensitivity setting, which helps reduce the number
of false positives. For example, if you find that you are getting false positives, you can decrease the
sensitivity setting. Or, conversely, if you find that the image scanning is missing inappropriate content,
you may want to set the sensitivity higher. The sensitivity setting is a value between 0 (no sensitivity)
and 100 (highly sensitive). The default sensitivity setting of 65 is recommended.
of false positives. For example, if you find that you are getting false positives, you can decrease the
sensitivity setting. Or, conversely, if you find that the image scanning is missing inappropriate content,
you may want to set the sensitivity higher. The sensitivity setting is a value between 0 (no sensitivity)
and 100 (highly sensitive). The default sensitivity setting of 65 is recommended.
Related Topics
•
Tuning Image Analysis Settings
Procedure
Step 1
Go to Security Services > IronPort Image Analysis.
Step 2
Click Edit Settings.
Step 3
Configure the settings for image analysis sensitivity. The default sensitivity setting of 65 is
recommended.
recommended.
Step 4
Configure the settings for Clean, Suspect, and Inappropriate verdicts.
When you configure the value ranges, ensure that you do not overlap values and that you use whole
integers.
integers.