What aspect of nuclear surety is most directly related to preventing unauthorized access?

The aspect of nuclear surety that most directly relates to preventing unauthorized access is safety and security protocols. These protocols are specifically designed to ensure that nuclear materials and weapons cannot be accessed or used by unauthorized individuals. This encompasses a broad range of measures, including physical security barriers, access controls, personnel security screening, and monitoring systems that actively track and respond to potential security breaches.

While weapon design complexity can contribute to making unauthorized access more difficult, its primary focus is not directly on managing access but rather on the functionality and technical aspects of the weapons themselves. International nuclear treaties aim at broader issues of non-proliferation and nuclear arms control, rather than direct security measures around existing stockpiles. Stockpile reduction measures focus on decreasing the number of nuclear weapons but do not inherently prevent unauthorized access to those that remain. Thus, safety and security protocols provide the necessary safeguards and systems to prevent unauthorized access effectively.