已知一个解密算法,如何写成加密算法,

哪位高手看看下面这个是什么解密算法, 
怎么根据它写成一个加密的? 
字符串为
ghFwNo9yfC4rLwtfiSth9+lIjUTXx8B78F7ehIKo1ohPdssjjLJnF0MWP0CH/qVpSvIdbDYkzxBuh9UwTeZjBmF4fqmjb0g8AmViKoXwBJRgPdPyN8FfN8CIdq1Z/SGospdja+8uG00Ml30b1X0S8GeW9+/cqt5XigSGj2nME7uaFj6iMDcUfIrzcCp59KKueSQfLug5iElxnF9hTs2QCg==以下算法可以将它解密出来
Data Source=192.168.1.15;Initial Catalog=AYLData;User ID=sa;Password=water345  哪位高手能根据这个算法,写出一个将上面解密过的Data Source=192.168.1.15;Initial Catalog=AYLData;User ID=sa;Password=water345 
加密成
ghFwNo9yfC4rLwtfiSth9+lIjUTXx8B78F7ehIKo1ohPdssjjLJnF0MWP0CH/qVpSvIdbDYkzxBuh9UwTeZjBmF4fqmjb0g8AmViKoXwBJRgPdPyN8FfN8CIdq1Z/SGospdja+8uG00Ml30b1X0S8GeW9+/cqt5XigSGj2nME7uaFj6iMDcUfIrzcCp59KKueSQfLug5iElxnF9hTs2QCg==namespace AJXCommon 
{ 
    using System; 
    using System.IO; 
    using System.Security.Cryptography; 
    using System.Text;     public class AJXDES 
    { 
        public static string DESDecrypt(string encryptedValue) 
        { 
            string key = "ajiaxisc"; 
            return DESDecrypt(encryptedValue, key, key); 
        }         public static string DESDecrypt(string encryptedValue, string key) 
        { 
            return DESDecrypt(encryptedValue, key, key); 
        }         public static string DESDecrypt(string encryptedValue, string key, string IV) 
        { 
            key = key + "asdfghjk"; 
            IV = IV + "asdfghjk"; 
            key = key.Substring(0, 8); 
            IV = IV.Substring(0, 8); 
            SymmetricAlgorithm sa = new DESCryptoServiceProvider(); 
            sa.Key = Encoding.UTF8.GetBytes(key); 
            sa.IV = Encoding.UTF8.GetBytes(IV); 
            ICryptoTransform ct = sa.CreateDecryptor(); 
            byte[] byt = Convert.FromBase64String(encryptedValue); 
            MemoryStream ms = new MemoryStream(); 
            CryptoStream cs = new CryptoStream(ms, ct, CryptoStreamMode.Write); 
            cs.Write(byt, 0, byt.Length); 
            cs.FlushFinalBlock(); 
            cs.Close(); 
            return Encoding.Unicode.GetString(ms.ToArray()); 
        } 
    } 
}