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可以查看：
<div class="codetitle"><a style="CURSOR: pointer" data="24421" class="copybut" id="copybut24421" onclick="doCopy('code24421')"> 代码如下:<div class="codebody" id="code24421">
OPEN SYMMETRIC KEY 命令关于 对称密钥加密使用证书解密
CREATE MASTER KEY ENCRYPTION BY PASSWORD = 'password'
go
CREATE CERTIFICATE CertTest
with SUBJECT = 'Test Certificate'
GO
--创建非对称密钥
CREATE ASYMMETRIC KEY TestAsymmetric
WITH ALGORITHM = RSA_2048
ENCRYPTION BY PASSWORD = 'password1' ;
GO
ALTER ASYMMETRIC KEY TestAsymmetric WITH PRIVATE KEY (DECRYPTION BY PASSWORD = 'password1') --DROP ASYMMETRIC KEY TestAsymmetric
--创建对称密钥
CREATE SYMMETRIC KEY TestSymmetric
WITH ALGORITHM = AES_256
ENCRYPTION BY PASSWORD = 'password' ;
GO OPEN SYMMETRIC KEY TestSymmetric
DECRYPTION BY PASSWORD = 'password' ; go
SELECT ENCRYPTBYASYMKEY(ASYMKEY_ID ('TestAsymmetric'),name),
CAST(deCRYPTBYASYMKEY (ASYMKEY_ID( 'TestAsymmetric'),ENCRYPTBYASYMKEY (ASYMKEY_ID( 'TestAsymmetric'),name ) )
as nvarchar(200 )),
ENCRYPTBYCERT ( Cert_ID('CertTest' ),
CAST(deCRYPTBYCERT (Cert_ID ('CertTest'),ENCRYPTBYCERT (Cert_ID( 'CertTest'),name ))
as nvarchar (200)),
EncryptByKey ( KEY_GUID('TestSymmetric' ),
CAST(decryptByKey (EncryptByKey (KEY_GUID ('TestSymmetric'),name))
as nvarchar (200)) FROM sys .objects
（编辑：李大同）
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