Encrypt a File using DES (Data Encryption standard) Algorithm in ASP.NET

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• N

  Nikolay16y agoPosted Aug 24, 2010, 2:34 AM

  Nice, but everybody should know that DES is now considered insecure. Using of not yet compromised algorithms is strongly recommended. See http://en.wikipedia.org/wiki/Data_Encryption_Standard
  • BJ

    Brijesh Jalan16y agoPosted Aug 26, 2010, 9:17 AM

    it is mostly time secure bt sometime nt....
• AB

  Andy Botsch16y agoPosted Aug 17, 2010, 1:06 PM

  Can this method also be used to encrypt .exe For example if I wanted to crypt a malicious file program of some sort and make it where it can still run, but it is not detected by antivirus.
  • BJ

    Brijesh Jalan16y agoPosted Aug 18, 2010, 2:37 AM

    Yes you can but first you convert .exe to text and than encrypt the text file
  • BJ

    Brijesh Jalan15y agoPosted Jan 6, 2011, 1:56 AM

    ya ofcourse it will work
• KM

  Koteswararao Mallisetti16y agoPosted Aug 17, 2010, 8:57 AM

  ok i am already test it ,it will also work fine good what about public key algorithms if have any code send me
  • BJ

    Brijesh Jalan16y agoPosted Aug 18, 2010, 2:42 AM

    hello koti, For public key encryption you can use RSA method to encrypt and decrypy This code will help you Imports System.Security Imports System.Security.Cryptography Imports System.Text Imports System.IO Public Class Tester Public Shared Sub Main Dim myRSAProvide As New RSACryptoServiceProvider() Dim strCrypt As String Dim strResult As String Dim bteCrypt() As Byte Dim bteResult() As Byte Try strCrypt = "hello my name is X" bteCrypt = Encoding.ASCII.GetBytes(strCrypt) bteResult = myRSAProvide.Encrypt(bteCrypt, False) Console.WriteLine(Encoding.ASCII.GetString(bteResult)) Catch ex As CryptographicException Console.WriteLine(ex.Message) End Try Dim strResault As String Dim bteDecrypt() As Byte Try bteDecrypt = myRSAProvide.Decrypt(bteResult, False) strResault = Encoding.ASCII.GetString(bteDecrypt) Console.WriteLine(strResault) Catch ex As CryptographicException Console.WriteLine(ex.Message) End Try End Sub End Class
• KM

  Koteswararao Mallisetti16y agoPosted Aug 17, 2010, 7:03 AM

  it work fine but where is the decryption code i need
  • BJ

    Brijesh Jalan16y agoPosted Aug 17, 2010, 7:08 AM

    hello koti, I hope this code will help you using System; using System.Collections; using System.Collections.Generic; using System.Data; using System.Diagnostics; using System.Security; using System.Security.Cryptography; using System.Text; using System.IO; 3.Now write the Code in the Page public class Tester { public static void Main() { try { DESCryptoServiceProvider myDESProvider = new DESCryptoServiceProvider(); myDESProvider.Key = ASCIIEncoding.ASCII.GetBytes("12345678"); myDESProvider.IV = ASCIIEncoding.ASCII.GetBytes("12345678"); FileStream DecryptedFile = new FileStream("testDes.txt", FileMode.Open, FileAccess.Read); ICryptoTransform myICryptoTransform = myDESProvider.CreateDecryptor(myDESProvider.Key, myDESProvider.IV); CryptoStream myCryptoStream = new CryptoStream(DecryptedFile, myICryptoTransform, CryptoStreamMode.Read); StreamReader myDecStreamReader = new StreamReader(myCryptoStream); StreamWriter myDecStreamWriter = new StreamWriter("p1.txt"); myDecStreamWriter.Write(myDecStreamReader.ReadToEnd()); myCryptoStream.Close(); myDecStreamReader.Close(); myDecStreamWriter.Close(); } catch (Exception ex) { Console.WriteLine(ex.ToString()); } } }