正解:C
Comprehensive and Detailed Step-by-Step Explanation:
For online payment security, bothconfidentiality(protection of data) andnonrepudiation(ensuring the sender cannot deny a transaction) are essential.
Option A (Incorrect):DES is outdatedandinsecurefor modern encryption needs. It has been replaced by stronger algorithms.
Option B (Incorrect):AES provides strong encryption(confidentiality) but does not handlenonrepudiationon its own.
Option C (Correct):PKI (Public Key Infrastructure)is the best solution because it providesencryption for confidentialityanddigital signatures for nonrepudiation, ensuring bothsecuretransactions andauthenticationof parties involved.
Option D (Incorrect):AVPN secures network traffic, but it does not address nonrepudiation, which is critical in online payments.
Reference:ISACA CISA Review Manual -Domain 5: Protection of Information Assets- Covers encryption, PKI, and secure payment processing.