A piece of asp.net DES encryption and decryption code

public string DesEncrypt(string strText, string strEncrKey) { byte[] byKey=null; byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; try { byKey = System.Text.Encoding.UTF8.GetBytes(strEncrKey.Substring(0,8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); byte[] inputByteArray =System.Text.Encoding.UTF8.GetBytes(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, IV), CryptoStreamMode.Write) ; cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); return Convert.ToBase64String(ms.ToArray()); } catch(System.Exception error) { MessageBox.Show(error.Message); return "error:" +error.Message+"/r"; } }

public string DesDecrypt(string strText,string sDecrKey) { byte[] byKey = null; byte[] IV= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF}; byte[] inputByteArray = new Byte[strText.Length]; try { byKey = System.Text.Encoding.UTF8.GetBytes(sDecrKey.Substring(0,8)); DESCryptoServiceProvider des = new DESCryptoServiceProvider(); inputByteArray = Convert.FromBase64String(strText); MemoryStream ms = new MemoryStream(); CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(byKey, IV), CryptoStreamMode.Write); cs.Write(inputByteArray, 0, inputByteArray.Length); cs.FlushFinalBlock(); System.Text.Encoding encoding = new System.Text.UTF8Encoding(); return encoding.GetString(ms.ToArray()); } catch(System.Exception error) { MessageBox.Show(error.Message); return "error:"+error.Message+"/r"; } }