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CompTIA Security+ · CompTIA
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A digital signature ties an email to the sender’s identity and ensures it hasn’t been altered. The sender cannot deny (repudiate) having sent it.
Non-repudiation is a concept in cybersecurity that ensures a party cannot deny their actions or agreements in a transaction or communication
Digital signatures are going to ensure non-repudiation by confirming that the email came from the user who signed it and has not been tampered with.