The invention discloses a data storage and query method based on classification characteristics and balanced binary tree. The method comprises the following steps: constructing a balanced binary tree to create nodes; dynamically classifying and storing data information in corresponding nodes according to the sequence of inorder traversal, preorder traversal and postorder traversal; and inputting an enquired content, dynamically traversing the AVL tree to obtain the desired data information. The method provided by the invention can lower the time complexity of dynamic query to static query level, thereby greatly improving storage and query efficiency. The method has the advantages of high speed, low energy consumption, less memory usage, and simple algorithm, and can be implemented by a plurality of languages. The method is widely suitable for data management in the communication field, in particular to massive data storage and query in communication of the internet of things.

Data storage and query method based on classification characteristics and balanced binary tree

Multi-stage security interconnection platform based on trusted computing and processing flow thereof

The invention provides an SQL injection and defense method aiming at a data base, which comprises the following steps: (a), receiving SQL statements accessing a data base and sent out by an application system; (b), performing the injection judging and checking to the SQL statements; if the SQL statements are SQL injection, intercepting the SQL injection, recording the mistake, and returning the abnormal information to the application system; if the SQL statements are not the SQL injection, querying an operational interface specification of the corresponding data base required to be accessed by the SQL statements, and splicing SQL statements conform to the data base operational interface specification; (c), sending the specified SQL statements spliced in the step (b) to a corresponding data base to perform data base operation; (d), returning the queried result to the application system. According to the invention, a data base agent server is arranged as per the method provided by the invention, an operation and maintenance method is used for rejecting access permission of any other application system except the data base agent server to the data base, thereby preventing the SQL injection.

Method and system for SQL injection and defense

The invention discloses a database safety access control method based on independent authorization, and belongs to the field of database safety. The designing thought that the method is in loose coupling with a database system is adopted, access control on the basis of users instead of database accounts is realized by binding database access behaviors with a USBKey, and control and audit can be conducted on behaviors of terminal users by correlating the database access behaviors and the terminal users. Advanced access control is introduced for conducting analyzing and monitoring on database access statements, therefore, database attack behaviors are shielded, insider operation behaviors are controlled and audited, and information loss caused by the database attacking behaviors can be reduced. By repackaging database access requests, monitoring and sniffing attacks are avoided. According to the technology, by adding the means of identity authentication, access control and safety transmission which are independent from a database management system, safety enhancing of a heterogeneous database management system under multiple platforms is realized on the premise that the usage mode of an existing application system is not changed.

Database safety access control method based on independent authorization

The invention provides a database security protection system and method based on virtual databases and virtual patches. A virtual database server is established in a service mapping mode for hiding a real database server, and secondary certification and secondary authorization check technologies are fused at the same time for processing a network request data packet reaching the virtual database server in real time so as to achieve the security effects equivalent to that of installation of database patches. According to the database security protection system and the method, service mapping and two key technologies namely secondary certification and secondary authorization check are adopted, all legitimate and normal security access can smoothly pass through the mapped virtual database server, and relative data is obtained from the real database server. For most of unauthorized access and obvious attack behaviors, the requests are blocked by relative filtering mechanisms in the virtual database server so as to ensure safe operation of the real database server and the security of sensitive data in databases.

Database security protection system and method based on virtual databases and virtual patches

The invention belongs to the technical field of information safety, and relates to a database transparent encryption method supporting ciphertext indexes. The method is realized on the basis of a view mechanism and a trigger mechanism of a database system and transparently provides automatic encryption and decryption for users by using the view and the trigger. Under the condition of data inquiry, data is decrypted in the process of filling the view; and when novel data is inserted into a table or the data is corrected, the trigger is utilized for the encryption of the data and the maintenance of the ciphertext indexes. The method for realizing the ciphertext indexes comprises: establishing an auxiliary data structure for realizing the ciphertext indexes and an inquiry and maintenance algorithm on the basis of the database table and SQL language; and utilizing an index extension mechanism of a database system to realize the call and maintenance of the ciphertext indexes. The method is completely transparent as for the database-based application system, does not need to change the prior application system after the deployment of a database security enhancing system, and can guarantee high efficiency of ciphertext retrieval.

Cryptograph index supported database transparent encryption method

The invention discloses a method for enhancing the database security based on an agent way, belonging to the technical field of the database and the information security. A requesting survey and filtration mechanism is deployed between an application server and a database server and comprises address mapping of the database server, entitlement management being independent of a database and dangerous command management function so as to finally achieve the purpose of enhancing the access security of the database; wherein the address mapping of the database server is the precondition of realizing independent entitlement management and dangerous command management function. In addition, the method is fully transparent for an application system accessing the database; the existing applicationsystem does not need to be changed after the method is deployed. The address mapping mechanism realizes the mapping function of an interface and hides a real IP address and the interface; therefore, an attacker can not directly interact with the database server, thus effectively increasing the security of the database.

Method for enhancing the database security based on agent way

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Cryptograph index supported database transparent encryption method

Method for enhancing the database security based on agent way