Hierarchical protection has several levels of security protection.

Legal analysis: the evaluation of equal insurance is divided into five levels, which gradually increases from level one to level five. The higher the level, the more important the information system is. General enterprise projects are mostly Class II and Class III. The military, electric power, finance and other units with specific high requirements for network security should meet Class III or IV requirements; First-class confidentiality and fifth-class confidentiality (classified) are rarely involved by units or organizations because of their low or high degree of confidentiality.

Legal basis: National Security Law of People's Republic of China (PRC).

Article 9 To safeguard national security, we should adhere to the principle of giving priority to prevention, treating both the symptoms and the root causes, and combining special work with the mass line, give full play to the role of specialized agencies and other relevant organs in safeguarding national security, mobilize citizens and organizations extensively, and prevent, stop and punish acts endangering national security according to law.

Article 10 To safeguard national security, we should adhere to mutual trust, mutual benefit, equality and cooperation, actively carry out security exchanges and cooperation with foreign governments and international organizations, fulfill international security obligations, promote common security and safeguard world peace.

Eleventh People's Republic of China (PRC) citizens, all state organs and armed forces, political parties and people's organizations, enterprises and institutions and other social organizations have the responsibility and obligation to safeguard national security.

China's sovereignty and territorial integrity are inviolable and indivisible. Safeguarding national sovereignty, unity and territorial integrity is the common obligation of all people in China, including compatriots from Hong Kong, Macao and Taiwan.

Article 12 The State shall commend and reward individuals and organizations that have made outstanding contributions to safeguarding national security.

Article 13 Any functionary of a state organ who abuses his power, neglects his duty or engages in malpractices for personal gain in national security work or activities involving national security shall be investigated for legal responsibility according to law.

Any individual or organization that violates this law and other relevant laws, fails to fulfill its obligation to safeguard national security and engages in activities that endanger national security shall be investigated for legal responsibility according to law.