TripleDES 属对称加密，对称加密在加密和解密时都使用相同的密钥，速度快。
TripleDESCryptoServiceProvider 的名称空间是：
System.Security.Cryptography byte[] plaintextBuffer = System.Text.Encoding.UTF8.GetBytes("明文"); //加密 TripleDESCryptoServiceProvider tripleDES = new TripleDESCryptoServiceProvider(); ICryptoTransform transform = tripleDES.CreateEncryptor(); byte[] cipherTextBuffer = transform.TransformFinalBlock(plaintextBuffer, 0, plaintextBuffer.Length); lbl.Text = Convert.ToBase64String(cipherTextBuffer) + "<br />"; transform.Dispose(); //解密 TripleDESCryptoServiceProvider tripleDES2 = new TripleDESCryptoServiceProvider(); ICryptoTransform transform2 = tripleDES2.CreateDecryptor(tripleDES.Key, tripleDES.IV); byte[] decryption = transform2.TransformFinalBlock(cipherTextBuffer, 0, cipherTextBuffer.Length); lbl.Text += System.Text.Encoding.UTF8.GetString(decryption) + "<br />"; transform2.Dispose();解密时，使用加密的 Key 和 IV。
转载于:https://www.cnblogs.com/deepwishly/archive/2009/12/25/2551328.html
