在sql server中制作对称密钥的下面两个语句之间的区别

Question

- 未通过认证加密的对称密钥

private void genEquation()
{
    while (play)
    {
        Application.DoEvents();   
        Console.WriteLine(secondCounter);
    }    
}

- 通过认证加密的对称密钥

create symmetric key SQLSymKey 
 with algorithm = aes_192 
    encryption by password ='uuu)) %';