Database System - Encryption

Encryption refers to the process of transforming data into a form that is unreadable, unless the reverse process of decryption is applied. Encryption algorithms use an en- cryption key to perform encryption, and they require a decryption key (which could be the same as the encryption key, depending on the encryption algorithm used) to perform decryption.

加密使数据不可读；配合解密密钥，可以使数据复原。在这种情况下，即使加密后的数据泄露， 攻击者也很难恢复原数据。

Encryption techniques