Information security means that the hardware and software of the information network and the data in its system are protected from being destroyed, changed or leaked by accidents or malicious reasons, and the system runs continuously, reliably and normally without interrupting information services. Information security mainly includes the following five aspects: the need to ensure confidentiality, authenticity, integrity, unauthorized copying and the security of parasitic systems. Its fundamental purpose is to protect internal information from external threats, so information is usually encrypted. In order to ensure information security, it is necessary to carry out information source authentication and access control, and there must be no illegal software resident and illegal operation. Information security is a comprehensive subject involving computer science, network technology, communication technology, cryptography technology, information security technology, applied mathematics, number theory, information theory and other disciplines.
Main application purposes:
1. authenticity: judging the source of information can identify information from forged sources.
2. Confidentiality: ensure that confidential information is not eavesdropped, otherwise eavesdroppers cannot understand the true meaning of the information.
3. Integrity: Ensure data consistency and prevent data from being tampered with by illegal users.
4. Availability: Ensure that legitimate users' use of information and resources will not be improperly rejected.
5. Undeniability: It is extremely important to establish an effective responsibility mechanism to prevent users from denying their actions.
6. Controllability: Ability to control the dissemination and content of information.
7. Auditability: Provide the basis and means for investigating emerging network security issues.