SELECT NationalIDNumber, EncryptedNationalIDĬONVERT(nvarchar, DecryptByKey(EncryptedNationalID))ī. Now list the original ID, the encrypted ID, and the

First, open the symmetric key with which to decrypt the data.ĭECRYPTION BY CERTIFICATE HumanResources037 This example decrypts ciphertext with a symmetric key.

See OPEN SYMMETRIC KEY (Transact-SQL) for more information. The symmetric key must already be open in the current session. Ensure this by calling DECRYPTBYKEY from an object (such as a view, or stored procedure, or function) that resides in the database. The DECRYPTBYKEY call must happen in the context of the database containing the encryption key. Symmetric encryption and decryption typically operates relatively quickly, and it works well for operations involving large data volumes. You do not have to open the key immediately before cipher text decryption. DECRYPTBYKEY will allow multiple keys open at the same time. The database must have this symmetric key already open. RemarksĭECRYPTBYKEY uses a symmetric key. DECRYPTBYKEY returns NULL if the symmetric key used for data encryption is not open or if ciphertext is NULL. Varbinary, with a maximum size of 8,000 bytes. Must match the value supplied to ENCRYPTBYKEY (Transact-SQL). authenticator has a sysname data variable containing data from which an authenticator generates. The data used as the basis for the generation of the authenticator. Must match the value passed to ENCRYPTBYKEY (Transact-SQL) during the data encryption process. Indicates whether the original encryption process included, and encrypted, an authenticator together with the plaintext. ArgumentsĪ variable of type varbinary containing data encrypted with the variable of type varbinary containing data encrypted with the key. To view Transact-SQL syntax for SQL Server 2014 and earlier, see Previous versions documentation.

Decrypt max script