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本主題尚未接受評分 - 為這個主題評分

EncryptByAsymKey (Transact-SQL)

SQL Server 2005

更新： 2006 年 4 月 14 日

利用非對稱金鑰為資料加密。

主題連結圖示 Transact-SQL 語法慣例

複製 

EncryptByAsymKey ( Asym_Key_ID , { 'plaintext' | @plaintext } )
Asym_Key_ID

這是資料庫中的非對稱金鑰識別碼。 int.

cleartext

這是要利用非對稱金鑰加密的資料字串。

@plaintext

nvarchar、char、varchar、binary、varbinary 或 nchar 類型的變數，其中包含要以非對稱金鑰加密的資料。

varbinary，大小上限為 8,000 位元組。

相較於利用對稱金鑰來加密及解密，利用非對稱金鑰來加密及解密的成本相當高。建議您不要使用非對稱金鑰來加密大型資料集，例如資料表中的使用者資料。您應該改用強式對稱金鑰來加密資料，並使用非對稱金鑰將該對稱金鑰加密。

下列範例利用非對稱金鑰 JanainaAsymKey02 將儲存在 @cleartext 中的文字加密。加密的資料會插入 ProtectedData04 資料表中。

複製 
INSERT INTO [AdventureWorks].[Sales].[ProtectedData04] 
    values( N'data encrypted by asymmetric key ''JanainaAsymKey02''',
    EncryptByAsymKey(AsymKey_ID('JanainaAsymKey02'), @cleartext) )
GO
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