Since there are a number of ways to implement Data Loss Prevention (DLP) within an enterprise, it is important to understand the value of different approaches. One approach to DLP is called “Redaction”, which involves blacking out the characters in a message or document, so that future consumers of the document can’t see sensitive portions of the document. The image below shows how a redacted message might look. Redaction has been mostly used in highly sensitive government or military environments for documents, but redaction can also be used in commercial organizations where the loss of sensitive information via email is a concern.
Clearly, in order to effectively redact content, some kind of rules must be applied to determine which portions should be blacked out. Once the sensitive portions have been identified, a number of different actions are usually taken to ensure that the sensitive information is not released. This article focuses on why redaction is an important option to have in an email system, and how it can be automated to help users protect sensitive information.