If a SIPRNet token is inserted into an unclassified card reader, what action must the subscriber take?

When a SIPRNet token is inserted into an unclassified card reader, the subscriber is required to report the event to the Trusted Agent. This procedure is critical because using a secure token in an unclassified environment can lead to potential security breaches or compromises. The Trusted Agent is responsible for maintaining the integrity of the system and ensuring that appropriate actions are taken to mitigate any risks associated with security incidents.

Reporting this incident allows for a proper investigation into how the token was used in an improper context, which helps in finding any possible vulnerabilities or areas of concern that need to be addressed. It also ensures that the necessary protocols are followed to keep the entire security infrastructure robust.

Other actions, such as ignoring the incident, changing the PIN, or removing the token from the reader, do not adequately address the potential security implications and do not contribute to the overall security process in dealing with such incidents. Reporting to the Trusted Agent aligns with the best practices of accountability and security management within the infrastructure.