Leveraging DKIM In Email Forensics

by Arman Gungor

My last article was about using the Content-Length header field in email forensics. While the Content-Length header is very useful, it has a couple of major shortcomings:

• Most email messages do not have the Content-Length header field populated
• If the suspect is aware of this data point, the integer value in the Content-Length header field is very easy to modify to make it match the length of the manipulated email payload

Wouldn’t it be great if there was something more widely used and tamper-resistant? Enter DKIM.

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