In this article, I’m explaining about Encryption and Decryption in .NET
Encryption: is the activity of converting data or information into code or a secret key.
Decryption: is the activity of making clear to converting from code into plain text.
Example:
Create a Class.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Security.Cryptography;
using System.IO;
using System.Text;
/// <summary>
/// Summary description for Class1
/// </summary>
public class Class1
{
string Encryptionkey = "123";
public string Encrypt(string originalText)
{
byte[] originalbytes = Encoding.Unicode.GetBytes(originalText);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pdb = new Rfc2898DeriveBytes(Encryptionkey, new Byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x76 });
encryptor.Key = pdb.GetBytes(32);
encryptor.IV = pdb.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateEncryptor(), CryptoStreamMode.Write))
{
cs.Write(originalbytes, 0, originalbytes.Length);
cs.Close();
}
originalText = Convert.ToBase64String(ms.ToArray());
}
}
return originalText;
}
public string Decrypt(string cipherText)
{
Byte[] cipherBytes = Convert.FromBase64String(cipherText);
using (Aes encryptor = Aes.Create())
{
Rfc2898DeriveBytes pbd = new Rfc2898DeriveBytes(Encryptionkey, new Byte[] { 0x49, 0x76, 0x61, 0x6e, 0x20, 0x4d, 0x65, 0x64, 0x76, 0x65, 0x64, 0x76 });
encryptor.Key = pbd.GetBytes(32);
encryptor.IV = pbd.GetBytes(16);
using (MemoryStream ms = new MemoryStream())
{
using (CryptoStream cs = new CryptoStream(ms, encryptor.CreateDecryptor(), CryptoStreamMode.Write))
{
cs.Write(cipherBytes, 0, cipherBytes.Length);
cs.Close();
}
cipherText = Encoding.Unicode.GetString(ms.ToArray());
}
}
return cipherText;
}
public Class1()
{
//
// TODO: Add constructor logic here
//
}
}
Create Default.aspx file
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<table>
<tr>
<td>Password</td>
<td colspan="2">
<asp:TextBox ID="txtPassword" runat="server"></asp:TextBox></td>
</tr>
<tr>
<td>Encryption text=</td>
<td>
<asp:Label ID="lblEnc" runat="server" Text=""></asp:Label></td>
<td>
<asp:Button ID="btnEncrypt" runat="server" Text="Encrypt" OnClick="btnEncrypt_Click" /></td>
</tr>
<tr>
<td>Decryption text=</td>
<td>
<asp:Label ID="lblDec" runat="server" Text=""></asp:Label></td>
<td>
<asp:Button ID="btnDecrypt" runat="server" Text="Decrypt" Enabled="False" OnClick="btnDecrypt_Click" /></td>
</tr>
<tr>
<td></td>
</tr>
</table>
</form>
</body>
</html>
Write in Default.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class _Default : System.Web.UI.Page
{
Class1 method = new Class1();
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnEncrypt_Click(object sender, EventArgs e)
{
lblEnc.Text =method.Encrypt(txtPassword.Text.Trim());
btnDecrypt.Enabled = true;
}
protected void btnDecrypt_Click(object sender, EventArgs e)
{
lblDec.Text = method.Decrypt(lblEnc.Text.Trim());
}
}
Output:
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