An organization wants to verify that its messages have not been altered during transit and originate from its legitimate domain. Which mechanism uses cryptographic verification in a header to provide this level of confidence?
A system that embeds cryptographic proofs in message headers, enabling validation of the sending domain by recipients
A framework that checks the IP address of the sending server against authorized host records for the domain
A mechanism that looks up published alignment data and instructs receiving servers to handle suspicious messages differently
A protocol that ensures end-to-end content protection by encrypting message bodies with user certificates
The correct option involves cryptographically signing messages within a header so the receiver can validate domain ownership by checking a public key in DNS. This method helps detect tampering and unauthorized senders because recipients can confirm the message's integrity using the signature. The option referring to IP address checks uses network-based records and does not provide cryptographic proof. The option describing user certificate encryption focuses on end-to-end secrecy rather than domain-level verification. The approach that looks up a published record alignment manages overall policy, but it does not attach its own cryptographic signature to each message.
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What is cryptographic signing in message headers?
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How does DNS store the public key used for verification?
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How does cryptographic verification help detect tampering?