What does 'dual-key system' refer to in nuclear weapon control?

The term 'dual-key system' in the context of nuclear weapon control is specifically designed to enhance security and control over the launch of nuclear weapons. This system requires that two authorized individuals must provide separate actions or approvals to launch a nuclear weapon. This mechanism is put in place to minimize the risk of unauthorized or accidental launch, ensuring that no single person has the sole authority to initiate such a critical action.

The dual-key system incorporates a level of checks and balances that is essential in nuclear operations, emphasizing the importance of communication and collaboration among authorized personnel. This requirement significantly raises the threshold for launching a nuclear weapon, thereby increasing the overall safety and security of nuclear arsenals.

In contrast, other options discuss different concepts. Public approval for launching a weapon, storage protocols for nuclear weapons, or systems for safeguarding facilities do not accurately capture the essence of the dual-key system. Each of those represents different aspects of nuclear security and control but does not relate specifically to the joint requirement of two authorized individuals acting in concert for nuclear launch decisions.