image encryption, please help!!

Hello, I am having a problem encrypting a tiff image..it
always loses
information after i decrypt and I know it has something to
do with the
encoding but i can't figure it out.  Any help would be
appreciated..
Here is the encrypt function:

private byte[] Encrypt(byte[] bytes)
{
key = new byte[8];
iv = new byte[8];

for (int x = 0; x < 8; x++)
{
	key[x] = Convert.ToByte(textBox3.Text[x]);
	iv[x] = Convert.ToByte(textBox4.Text[x]);
}

DESCryptoServiceProvider cryptProvider = new
DESCryptoServiceProvider();
ICryptoTransform transform =
cryptProvider.CreateEncryptor(key, iv);
MemoryStream ms = new MemoryStream();
CryptoStream cs = new CryptoStream(ms, transform,
CryptoStreamMode.Write);
cs.Write(bytes, 0, bytes.Length);
cs.FlushFinalBlock();
ms.Flush();

return (ms.GetBuffer());

}


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