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Updated on 2025-03-06

C# Method to Encrypt User Passwords using Pseudo-Random Numbers

C# Method to Encrypt User Passwords using Pseudo-Random Numbers

Updated: July 26, 2014 09:50:11 Submission: shichen2014
This article mainly introduces the method of C# using pseudo-random numbers to encrypt user passwords. It has certain reference value for developing C# member system or program security issues. Friends who need it can refer to it.

The examples described in this article are to encrypt user passwords using pseudo-random numbers. This code is the main code of the core part and needs to be implemented in conjunction with other programs. Interested readers can further improve it themselves, without any trouble. The main codes are listed below:

using System; 
using ; 
using ; 
using ; 
using ; 
using ; 
using ; 
using ; 
namespace PRanDataEncrypt 
{ 
public partial class Form1 : Form 
{ 
public Form1() 
{ 
InitializeComponent(); 
} 
private void button1_Click(object sender, EventArgs e) 
{ 
if ( != "") 
{ 
if (DecryptPwd() == ) 
("User login successfully!", "hint", , ); 
else 
("User password is wrong!", "mistake", , ); 
} 
} 

private void button2_Click(object sender, EventArgs e) 
{ 
 =  =  = ; 
(); 
} 

private void textBox2_TextChanged(object sender, EventArgs e) 
{ 
 = EncryptPwd(); 
} 

//Define the pseudo-random number used to encrypt user passwordprivate string randStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz"; 
#region Encrypt user login password using pseudo-random number/// <summary> 
/// Encrypt user login password using pseudo-random number/// </summary> 
/// <param name="str">User login password</param>/// <returns>Encrypted user login password</returns>private string EncryptPwd(string str) 
{ 
byte[] btData = (str); 
int j, k, m; 
int len = ; 
StringBuilder sb = new StringBuilder(); 
Random rand = new Random(); 
for (int i = 0; i &lt; ; i++) 
{ 
j = (byte)(6); 
btData[i] = (byte)((int)btData[i] ^ j); 
k = (int)btData[i] % len; 
m = (int)btData[i] / len; 
m = m * 8 + j; 
((k, 1) + (m, 1)); 
} 
return (); 
} 
#endregion 
#region Decrypt user login password/// &lt;summary&gt; 
/// Decrypt the user login password/// &lt;/summary&gt; 
/// <param name="str">Encrypted user login password</param>/// <returns>Decrypted user login password</returns>private string DecryptPwd(string str) 
{ 
try 
{ 
int j, k, m, n = 0; 
int len = ; 
byte[] btData = new byte[ / 2]; 
for (int i = 0; i &lt; ; i += 2) 
{ 
k = (str[i]); 
m = (str[i + 1]); 
j = m / 8; 
m = m - j * 8; 
btData[n] = (byte)(j * len + k); 
btData[n] = (byte)((int)btData[n] ^ m); 
n++; 
} 
return (btData); 
} 
catch { return ""; } 
} 
#endregion 
} 
}
  • C#
  • Pseudo-random number
  • encryption
  • password

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