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An X.509 public key certificate with the key usage attribute "non-repudiation" can be used for which of the following?
Correct Answer: C
Explanation/Reference: Explanation: Support for two pairs of public-private keys is a fundamental requirement for some PKIs. One key pair is for data encryption and the other key pair is for digitally signing documents. When digitally signing a message for non-repudiation, the private key is used. The public key (with the key usage attribute "non-repudiation") associated with the private key is used to verify the signed messages. Incorrect Answers: A: An X.509 public key certificate with the key usage attribute "non-repudiation" cannot be used for encrypting messages. B: When digitally signing a message for non-repudiation, the private key is used, not the public key. D: An X.509 public key certificate with the key usage attribute "non-repudiation" cannot be used for decrypting messages. References: https://docs.oracle.com/cd/E13215_01/wlibc/docs81/admin/certificates.html