In
this article I will explain what is encryption and decryption with example
Encryption is
the process of translating plain text data into something that appears to be
meaningless and random. Encryption
is a great way to keep valuable data safe—whether you’re transmitting it over
the Internet, backing it up on a server, or just carrying it through airport
security on your laptop. Encrypting your data makes it completely unreadable to
anyone but you or its intended recipient.
Decryption is the process of translating random and
meaningless data to plain text. Why we need to use this Encryption and
decryption processes
Design :
<%@
Page Language="C#" AutoEventWireup="true" CodeFile="PasswordProtect.aspx.cs" Inherits="PasswordProtect"
%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>
UserName:</td>
<td>
<asp:TextBox ID="txtUserName" runat="server"></asp:TextBox></td>
</tr>
<tr>
<td>
Password:</td>
<td>
<asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox></td>
</tr>
<tr>
<td colspan="2" align="center">
<asp:Button ID="btnCreate" runat="server" Text="Encrypt Account"
onclick="btnEncript_Click"
/>
</td>
</tr>
</table>
<br />
<asp:Button ID="btnCheck" runat="server" Text="Decrypt Data" onclick="btnDecrypt_Click" />
<asp:Label ID="Label1" runat="server"></asp:Label>
</div>
<div>
</div>
</form>
</body>
</html>
using System;
using
System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using
System.Web.UI.WebControls;
public partial class PasswordProtect : System.Web.UI.Page
{
protected void Page_Load(object
sender, EventArgs e)
{
}
// Bellow event
is used for Encrypt the Password
protected void btnEncript_Click(object
sender, EventArgs e)
{
string
val = txtPassword.Text;
string
pass = PasswordProtect.base64Encode(val);
Label1.Text = pass;
}
// Bellow event
is used for Decrypt the Password
protected void btnDecrypt_Click(object
sender, EventArgs e)
{
string
str = PasswordProtect.base64Decode(Label1.Text);
Label1.Text = str;
}
// Below code is
usefull for Encrypt the password
public static string
base64Encode(string sData)
{
try
{
byte[]
encData_byte = new byte[sData.Length];
encData_byte = System.Text.Encoding.UTF8.GetBytes(sData);
string
encodedData = Convert.ToBase64String(encData_byte);
return
encodedData;
}
catch (Exception ex)
{
throw
new Exception("Error in base64Encode" + ex.Message);
}
}
// Below code is
usefull for Decrypt the password
public static string
base64Decode(string sData)
{
try
{
System.Text.UTF8Encoding encoder = new
System.Text.UTF8Encoding();
System.Text.Decoder utf8Decode = encoder.GetDecoder();
byte[]
todecode_byte = Convert.FromBase64String(sData);
int
charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
char[]
decoded_char = new char[charCount];
utf8Decode.GetChars(todecode_byte,
0, todecode_byte.Length, decoded_char, 0);
string
result = new String(decoded_char);
return
result;
}
catch (Exception ex)
{
throw
new Exception("Error in base64Decode" + ex.Message);
}
}
}
Output Screens :
Here I entered Username is 'satya' and Password is 'satya' after i clicked the Encryption button.
After clicked the encryption button encrypted code is shown below. See the below screen shot for quick identification .
Finally clicked the Decryption button , Decryption code is showing like 'satya'
Using the example its more easy and quick to understand encryption and decryption process. Do also throw some light on the application and tools which are based on this technique. I am curious to learn about them.
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