What is a key factor in ensuring the security of an ISU?

A key factor in ensuring the security of an Integration System User (ISU) is disabling the implementer account when it is not in use. This practice minimizes the exposure of the account to potential security breaches or unauthorized access. By keeping the account disabled, you significantly reduce the risk of credential theft or misuse, as the account would not be available for unauthorized users to exploit.

When an implementer account is active, it has access permissions that can be misused if credentials are compromised. Thus, it's essential to manage such accounts actively by disabling them when their functions are not required. This contributes to the overall security posture of the system by ensuring that only necessary accounts are active at any given time, reducing the attack surface.

In contrast, while regular audits and reviews, disabling unnecessary features, and implementing strong password policies are important security measures, they do not specifically address the unique risks associated with having an active implementer account available for use. Each of these measures contributes to a robust security strategy, but the focused action of disabling the implementer account provides a direct and effective method of mitigating specific risks associated with ISUs.