Identify the correct statement with respect to a digital certificate
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A scanned copy of a paper certificate document is called a digital certificate
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Voice signal converted from analog to digital signal during transmission on a PSTN network
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An encryption mechanism for confirming the message sender and integrity of the message received
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none of the above
To solve this question, the user needs to have an understanding of digital certificates.
Option A: This option is incorrect. A digital certificate is not a scanned copy of a paper certificate. A digital certificate is an electronic document that verifies the identity of the certificate holder.
Option B: This option is incorrect. Voice signal conversion from analog to digital signal during transmission on a public switched telephone network (PSTN) is not related to digital certificates.
Option C: This option is correct. A digital certificate is an encryption mechanism that confirms the message sender and integrity of the message received. It contains information about the identity of the certificate holder, including their public key.
Option D: This option is incorrect. Option C is the correct statement.
Therefore, the answer is: C
A digital certificate is an encryption-based mechanism (built on public-key infrastructure) that binds a public key to an identity, allowing a recipient to confirm the sender's identity and verify that the received message hasn't been tampered with (integrity), typically via a digital signature issued/vouched-for by a trusted Certificate Authority. A scanned paper certificate is just an image, not a cryptographic object. Analog-to-digital voice conversion on a PSTN network is unrelated telephony signal processing, not a security/identity construct. So the encryption/authentication-and-integrity definition is the correct statement.