Rijndael Algorithm in C#

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public static string encrypt(string key,string plaintext)
{
byte[] iv = new byte[16];//16 means lenght of key is 16
using(Rijndael rij=Rijndael.Create())
{
rij.Key = Encoding.UTF8.GetBytes(key);
rij.IV = iv;
ICryptoTransform encryptor = rij.CreateEncryptor(rij.Key, rij.IV);
var ms = new MemoryStream();
var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
byte[] input = Encoding.UTF8.GetBytes(plaintext);
cs.Write(input, 0, input.Length);
cs.FlushFinalBlock();
return Convert.ToBase64String(ms.ToArray());
}
}
public static string Decrypt(string key, string CipherText)
{
byte[] iv = new byte[16];//16 means lenght of key is 16
byte[] buffer = Convert.FromBase64String(CipherText);
using (Rijndael rij = Rijndael.Create())
{
rij.Key = Encoding.UTF8.GetBytes(key);
rij.IV = iv;
ICryptoTransform encryptor = rij.CreateDecryptor(rij.Key, rij.IV);
var ms = new MemoryStream();
var cs = new CryptoStream(ms, encryptor, CryptoStreamMode.Write);
cs.Write(buffer, 0, buffer.Length);
cs.FlushFinalBlock();
return Encoding.UTF8.GetString(ms.ToArray());
}
}