What method can be used to prevent unauthorized access to Transient Cyber Assets?

Multi-factor authentication is an effective method for preventing unauthorized access to Transient Cyber Assets because it enhances the security of authentication processes. By requiring multiple forms of verification, such as something the user knows (like a password), something the user has (like a security token), or something the user is (like a fingerprint), it significantly reduces the risk of unauthorized access. Even if one factor, such as a password, is compromised, the additional factors provide layers of security that make it much harder for an unauthorized individual to gain access.

Transient Cyber Assets, which are often temporary and may not have the same level of security as more permanent infrastructure, can especially benefit from this additional protection. Implementing multi-factor authentication helps ensure that only authorized personnel can access sensitive systems or data, thereby supporting compliance with NERC CIP standards, which emphasize the necessity of safeguarding critical infrastructure against cybersecurity threats.

Other methods such as application whitelisting, a live operating system, and system hardening also contribute to security but address different aspects and may not be as directly aligned with controlling access in scenarios specifically involving transient assets.