SQL database security encryption is practically an algorithm that transforms data within a database from a readable state into a cipher text of unreadable characters. The algorithm will generate a key which the user can use to decrypt the data and retrieve the usable information as needed. Unlike antivirus software or password protection security methods, this algorithm applies on the data itself. The difference is important: if the system is breached, the data is still only readable for users who have the right encryption keys, making the SQL database security encryption a harder system to crack.

Here are some SQL database security encryption methods: 

– API: This is application-level encryption that is appropriate across any database product (Oracle, MSSQL, etc). Queries made in the encrypted columns are modified within the application, implying hands-on work. If the database is large, then this approach will consume a great amount of time. Another detail you should know is that encryption which functions at the application level can lead to an increase in performance issues. 

– Plug-In: This method implies attaching an encryption module to the database management system. It will function independently from the application, will require less code management and modification, and will offer more flexibility. This means that you can apply the plug-in security method to both commercial and open-source databases. With this option, you will typically use column-level encryption.

– TDE: Transparent data encryption (TDE) executes encryption and decryption within the database engine itself. This SQL database security encryption method doesn’t require code modification of the database or application and is easier for administrators to manage. These details make TDE a popular method of database encryption.