How to Encrypt and Decrypt a String in C#

The System.Security.Cryptography namespace provides the necessary classes to implement TripleDES encryption and decryption.

How to encrypt and decrypt a string using TripleDES in C#?

Open Visual Studio, then 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

C# Encrypt Decrypt String

Drag and drop the Label, Button, and Textbox controls from the Visual Toolbox onto your form designer, then design your form as shown below.

C# Encrypt String

// This method will encrypt a plain text string using TripleDES in C#
private void btnEncrypt_Click(object sender, EventArgs e)
{
    // Input text to bytes
    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 using TripleDES
        using (TripleDESCryptoServiceProvider tripDes = new TripleDESCryptoServiceProvider() { Key = keys, Mode = CipherMode.ECB, Padding = PaddingMode.PKCS7 })
        {
            // Encrypt data
            ICryptoTransform transform = tripDes.CreateEncryptor();
            byte[] results = transform.TransformFinalBlock(data, 0, data.Length);
            // Convert encrypted data to base64 string
            txtEncrypt.Text = Convert.ToBase64String(results, 0, results.Length);
        }
    }
}

C# Decrypt String

// This method will decrypt the encrypted string back to plain text in C#
private void btnDecrypt_Click(object sender, EventArgs e)
{
    // Convert the base64 encoded encrypted string to a byte array
    byte[] data = Convert.FromBase64String(txtEncrypt.Text);
    // Decrypt data using TripleDES
    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);
        }
    }
}

Add code to handle your main form as shown below.

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
    }
}

TripleDES (3DES) is a symmetric encryption algorithm that applies the DES (Data Encryption Standard) algorithm three times to each data block. It uses either two or three 56-bit keys, effectively creating a key length of 112 or 168 bits.

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