Encrypts data with the public key of a certificate.
Applies to: SQL Server (SQL Server 2008 through current version).
This function encrypts data with the public key of a certificate. The ciphertext can only be decrypted with the corresponding private key. Such asymmetric transformations are very costly compared to encryption and decryption using a symmetric key. Asymmetric encryption is therefore not recommended when working with large datasets such as user data in tables.
This example encrypts the plaintext stored in @cleartext with the certificate called JanainaCert02. The encrypted data is inserted into table ProtectedData04.
INSERT INTO [AdventureWorks2012].[ProtectedData04] VALUES ( N'Data encrypted by certificate ''Shipping04''', EncryptByCert(Cert_ID('JanainaCert02'), @cleartext) ); GO