What is an acceptable method for verifying messages within an electronic funds transfer system?

In an electronic funds transfer (EFT) system, message verification is crucial for ensuring the integrity and authenticity of the transactions. The chosen method of verifying messages should enhance security by ensuring that the sender is legitimate and that the message has not been altered during transmission.

The option that focuses on verifying only the messages of other users is significant because it introduces a layer of audit and oversight. By verifying the transactions initiated by others, a user can help ensure that fraudulent or erroneous transactions are not being processed within the system. This practice can contribute to maintaining a robust and secure environmental environment in EFT transactions.

In contrast, the other options present potential concerns. For instance, capturing and verifying one’s own messages does not provide oversight and could lead to conflicts of interest or lack of accountability. Sending and verifying messages in a single action may also increase the risk of errors or manipulation since there is no independent validation process. Lastly, capturing, sending, and verifying both one’s own and others' messages may lead to complexity without necessarily enhancing the security posture beyond simply verifying others.

Overall, the focus on verifying messages from other users serves as a strong control measure within the context of an EFT system, emphasizing the importance of independent verification to safeguard the system's integrity.