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In PKI, a message encrypted by a user's public key can be decrypted by the CA or certifying authority.
True
False
A CA has no authority or means of decrypting a message encrypted by a public key. Only the corresponding private key can do so. Please state explicitly that you are referring to a non-CA public key with „the key“. Thus, correct worrding would be „any public key can ...“ ....Agree with comment. A CA can definitely decrypt a message if it was encrypted with the CA's public key. I added this to the question to create a better answer.
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