C#

public string DecryptWithRijndael( string Key, string strDecode )<br />
		{<br />
			<br />
			ASCIIEncoding textConverter = new ASCIIEncoding();<br />
			RijndaelManaged myRijndael = new RijndaelManaged();         <br />
			// set mode<br />
			myRijndael.Mode = CipherMode.ECB; // Set mode<br />
			myRijndael.Padding = PaddingMode.PKCS7; // Set padding         <br />
			byte[] key = textConverter.GetBytes(Key);   //Create a new key and initialization vector<br />
			<br />
			// Get final key and initialization vector<br />
			myRijndael.Key=key;<br />
			myRijndael.GenerateIV();<br />
			<br />
			byte[] IV = myRijndael.IV;<br />
			<br />
			byte[] encrypted = Convert.FromBase64String( strDecode );<br />
<br />
			//Get a decryptor that uses the same key and IV as the encryptor.<br />
			ICryptoTransform decryptor = myRijndael.CreateDecryptor(key, IV);<br />
<br />
			<br />
			//Now decrypt the previously encrypted message using the decryptor<br />
			// obtained in the above step<br />
			MemoryStream msDecrypt = new MemoryStream(encrypted);<br />
			CryptoStream csDecrypt = new CryptoStream(msDecrypt, decryptor, CryptoStreamMode.Read);<br />
			byte[] fromEncrypt = new byte[encrypted.Length];<br />
			<br />
			//Read the data out of the crypto stream<br />
<br />
			csDecrypt.Read(fromEncrypt, 0, fromEncrypt.Length);<br />
			<br />
			//Convert the byte array back into a string<br />
			string sDecoded = textConverter.GetString(fromEncrypt);<br />
			return sDecoded;<br />
		}  

<italic>Work hard and a bit of luck is the key to success.