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Database encryption is the process of converting data, within a database, in plain text format into a meaningless cipher text by means of a suitable algorithm.
Database decryption is converting the meaningless cipher text into the original information using keys generated by the encryption algorithms.
Database encryption can be provided at the file or column level.
Encryption of a database is costly and requires more storage space than the original data. The steps in encrypting a database are:
Numerous algorithms are used for encryption. These algorithms generate keys related to the encrypted data. These keys set a link between the encryption and decryption procedures. The encrypted data can be decrypted only by using these keys.
Different databases, such as SQL, Oracle, Access and DB2, have unique encryption and decryption methods.