Question

Ive written in sql :

CREATE SYMMETRIC KEY SecureSymmetricKey
    WITH ALGORITHM = TRIPLE_DES
    ENCRYPTION BY PASSWORD = 'StrongPassword';

---

DECLARE  @str NVARCHAR(1000)
SET @str = 'lala';

OPEN SYMMETRIC KEY SecureSymmetricKey
    DECRYPTION BY PASSWORD = 'StrongPassword';

---

DECLARE @encrypted_str VARBINARY(MAX)
SET @encrypted_str = 
          EncryptByKey(Key_GUID('SecureSymmetricKey'), @str);

• the encrypted_str value is in a table now.

how can i read it in c# ? ( and decrypt in c# )

Answer 1

You don’t “decrypt” it in C#. Decrypt it in the select statement on the way back out.