Dating pro 2016 null
So this protects the data from rogue administrators, backup thieves, and man-in-the-middle attacks.
Unlike TDE, as well, Always Encrypted allows you to encrypt only certain columns, rather than the entire database.
The client library ensures that plaintext is only revealed within the application or middle tier, and nowhere in between the application and the database.
In the following illustration, I attempt to show that the data is simply ciphertext both in the database and in both directions between the application and the database: And this brings about the first limitation of Always Encrypted: It is not supported by all client libraries at this moment.
Encrypted Table(Last Name, Salary) SELECT N'Bertrand',720000; -- Result: Msg 206, Level 16, State 2 Operand type clash: nvarchar is incompatible with nvarchar(4000) encrypted with (encryption_type = 'DETERMINISTIC', encryption_algorithm_name = 'AEAD_AES_256_CBC_HMAC_SHA_256', column_encryption_key_name = 'Column Key', column_encryption_key_database_name = 'AEDemo')DECLARE @Last Name NVARCHAR(32) = N'Bertrand', @Salary INT = 720000; INSERT dbo.
Also, any columns using string data types that use deterministic encryption must use one of the BIN2 collations. Encrypted Table ( ID INT IDENTITY(1,1) PRIMARY KEY, Last Name NVARCHAR(32) COLLATE Latin1_General_BIN2 ENCRYPTED WITH ( ENCRYPTION_TYPE = DETERMINISTIC, ALGORITHM = 'AEAD_AES_256_CBC_HMAC_SHA_256', COLUMN_ENCRYPTION_KEY = Column Key ) NOT NULL, Salary INT ENCRYPTED WITH ( ENCRYPTION_TYPE = RANDOMIZED, ALGORITHM = 'AEAD_AES_256_CBC_HMAC_SHA_256', COLUMN_ENCRYPTION_KEY = Column Key ) NOT NULL ); GO CREATE PROCEDURE dbo.Add Person @Last Name NVARCHAR(32), @Salary INT AS BEGIN INSERT dbo.Encrypted Table(Last Name, Salary) SELECT @Last Name, @Salary; END GO CREATE PROCEDURE dbo.We want to use deterministic encryption for Last Name, because we're likely to look up an employee that way, but we can use randomized encryption on Salary, because we're highly unlikely to ever want to look up an employee because they are making ,208 (and we know we can't perform range queries in any case).
The syntax for specifying encryption on a column is a bit cumbersome.
The encryption scheme for the columns/variables is (encryption_type = 'PLAINTEXT') and the expression near line '2' expects it to be (encryption_type = 'DETERMINISTIC', encryption_algorithm_name = 'AEAD_AES_256_CBC_HMAC_SHA_256', column_encryption_key_name = 'Column Key', column_encryption_key_database_name = 'AEDemo') (or weaker).