![]() The recipient can then retrieve the signer’s public key with a DNS query, and attempt to verify the digital signature to determine whether the signature is valid. The public key of the signing entity is published as a _domainkey DNS TXT Resource Record for the signer’s domain. The signing entity hashes the body of the message and digitally signs it along with a subset of its header fields using its private key. ![]() ![]() The entity can be the organization of the author of the message, or a relay. What is DKIM?ĭomainKeys Identified Mail (DKIM) is an internet standard that allows an entity to assert responsibility for a message in transit. Wouldn’t it be great if there was something more widely used and tamper-resistant? Enter DKIM. 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.Most email messages do not have the Content-Length header field populated.While the Content-Length header is very useful, it has a couple of major shortcomings: ![]() My last article was about using the Content-Length header field in email forensics. ![]()
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