What is database security?
Database security refers to protecting the database from data leakage, alteration or damage caused by illegal use.
Security issues are not unique to database systems, all computer systems have this problem. Just that a large amount of data is stored centrally in the database system and is directly shared by many end users, making security issues more prominent. Whether the system security protection measures are effective is one of the main indicators of the database system. The security of databases and the security of computer systems, including the security of operating systems and network systems, are closely related and mutually supportive.
Common methods and technologies to implement database security control are:
(1) User identification and authentication: This method provides a certain way for users to identify themselves by the system. We spoon name or identity. Every time a user requests to enter the system, the system will verify it and only provide the right to use the system after passing the authentication.
(2) Access control: Ensure that only users with legal permissions access the database through user permission definition and legal rights check, and all unauthorized personnel cannot access data. For example, autonomous access control (I)AC) in level C2 and mandatory access control (M.AC) in level Bl.
(3) View mechanism: Define views for different users, and hide the data to be confidential from users who do not have access rights through the view mechanism, thus automatically providing a certain degree of security protection for the data.
(4) Audit: Establish an audit log, automatically record all user operations on the database and put them in the audit log. The DBA can use the audit trail information to reproduce a series of events that led to the current status of the database. , find out who, when and what content illegally accesses data.
(5) Data encryption: Encrypt the stored and transmitted data so that people who do not know the decryption algorithm cannot obtain the content of the data.
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