Windows Forms: Encrypt and Decrypt a String in C#

Step 1: Click New Project, then select Visual C# on the left, then Windows and then select Windows Forms Application. Name your project "EncryptDecrypt" and then click OK

Step 2: Design your form as below

Step 3: Add code to handle your form

using System;
using System.Security.Cryptography;
using System.Text;
using System.Windows.Forms;

namespace EncryptDecrypt
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        string hash = "f0xle@rn";//Create a hash key

        private void btnEncrypt_Click(object sender, EventArgs e)
        {
            byte[] data = UTF8Encoding.UTF8.GetBytes(txtValue.Text);
            using (MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider())
            {
                byte[] keys = md5.ComputeHash(UTF8Encoding.UTF8.GetBytes(hash));//Get hash key
                //Encrypt data by hash key
                using (TripleDESCryptoServiceProvider tripDes = new TripleDESCryptoServiceProvider() { Key = keys, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 })
                {
                    ICryptoTransform transform = tripDes.CreateEncryptor();
                    byte[] results = transform.TransformFinalBlock(data, 0, data.Length);
                    txtEncrypt.Text = Convert.ToBase64String(results, 0, results.Length);
                }
            }
        }

        private void btnDecrypt_Click(object sender, EventArgs e)
        {
            //Convert a string to byte array
            byte[] data = Convert.FromBase64String(txtEncrypt.Text);
            using (MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider())
            {
                byte[] keys = md5.ComputeHash(UTF8Encoding.UTF8.GetBytes(hash));//Get hash key
                //Decrypt data by hash key
                using (TripleDESCryptoServiceProvider tripDes = new TripleDESCryptoServiceProvider() { Key = keys, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 })
                {
                    ICryptoTransform transform = tripDes.CreateDecryptor();
                    byte[] results = transform.TransformFinalBlock(data, 0, data.Length);
                    txtDecrypt.Text = UTF8Encoding.UTF8.GetString(results);
                }
            }
        }
    }
}

TripleDES uses three successive iterations of the DES algorithm. It can use either two or three 56-bit keys.

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