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这个应该没法比,delphi .net 就是delphi , vb.net 也就是VB
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一般来说,VB因为是微软的产品与windows 结合紧密一些,开发一般病毒可能简单点..甚至一般的VB脚本都可以对系统产生威胁...但如果对较高层次的病毒,限于VB自身限制可能有点难度..
而DELPhi 因为如果理解深入后,编制病毒也很容易,另外,DELPHI 可以对内存/指针/等底层进行很容易读写,还可以嵌入汇编..编制高级病毒是可行了.....
不过,没有不好的工具,只有垃圾的人......原理明白后,所谓语言只是实现罢了...
注册码很好做啊 利用现在成熟的加密解密技术 很不容易破解的 但现在的.net时代 问题的关键不在这里 而是在如何加密自己的软件不让反编译 看看现在的.net软件 就算使用了乱码器 都好容易被反编译出来 只要被反编译 就会删掉你程序的注册功能部分 然后再重新编译 就可以无需注册正常使用了 根本就不用去破解你那深奥的注册码！
Private Function myEncrypt(ByVal Code As String) As String
Dim Result As String = ""
Dim CurrentChar As Char
For i As Integer = 0 To Code.Length - 1
CurrentChar = Code.Substring(i, 1)
Select Case Code.Substring(i, 1)
Case "Z"
Result = "a"
Case "z"
Result = "A"
Case Else
Result = Chr(Asc(CurrentChar) + 1)
End Select
Next
Return Result
End Function
'vb.net 2005 调试通过
VB.NET的程序很容易反编译的，所以写到类中好像并不安全
建议
1.用户登录所使用的账户的权限一定要控制好
2.可以把连接字符串硬编码到exe或者dll中，然后用.NET的混淆软件加密混淆（一定要选择加密字符串）
3.使用其他的技术使用户间接操作数据库。可以在服务器远程建立一个服务器（接受Sockets连接），或者建立一个动态网页。让用户连接到这些客户端，发送一些指令，对数据库的查操作由这个服务器上的程序代它完成，然后把结果给用户
vb.net code注意随机密码按钮在没用，调试时你自己输入密码，一定为8位，我是将文件存在D盘，你自己在修改一下，那个就很简单
Imports System.IO
Imports System.Security.Cryptography
Imports System.Text
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim sSecretKey As String = Me.TextBox2.Text
EncryptFile(Me.TextBox1.Text, "D:\JMtest.txt", sSecretKey)
End Sub
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
Dim sSecretKey As String = Me.TextBox2.Text
DecryptFile("D:\JMtest.txt", "D:\Decrypted.txt", sSecretKey)
End Sub
Sub EncryptFile(ByVal sInputFilename As String, ByVal sOutputFilename As String, ByVal sKey As String)
Dim fsInput As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read)
Dim fsEncrypted As New FileStream(sOutputFilename, FileMode.Create, FileAccess.Write)
Dim DES As New DESCryptoServiceProvider
DES.Key = ASCIIEncoding.ASCII.GetBytes(sKey)
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)
Dim desencrypt As ICryptoTransform = DES.CreateEncryptor()
Dim cryptostream As New CryptoStream(fsEncrypted, desencrypt, CryptoStreamMode.Write)
Dim byteArrayInput(fsInput.Length - 1) As Byte
fsInput.Read(byteArrayInput, 0, byteArrayInput.Length)
cryptostream.Write(byteArrayInput, 0, byteArrayInput.Length)
cryptostream.Close()
End Sub
Sub DecryptFile(ByVal sInputFilename As String, ByVal sOutputFilename As String, ByVal sKey As String)
Dim DES As New DESCryptoServiceProvider
DES.Key() = ASCIIEncoding.ASCII.GetBytes(sKey)
DES.IV = ASCIIEncoding.ASCII.GetBytes(sKey)
Dim fsread As New FileStream(sInputFilename, FileMode.Open, FileAccess.Read)
Dim desdecrypt As ICryptoTransform = DES.CreateDecryptor
Dim cryptostreamDecr As New CryptoStream(fsread, desdecrypt, CryptoStreamMode.Read)
Dim fsDecrypted As New StreamWriter(sOutputFilename)
fsDecrypted.Write(New StreamReader(cryptostreamDecr, System.Text.ASCIIEncoding.Default).ReadToEnd)
fsDecrypted.Flush()
fsDecrypted.Close()
End Sub
Private Sub BtnChoose_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnChoose.Click
OpenFileDialog1.FileName = ""
OpenFileDialog1.Filter = "txt files (*.txt)|*.txt"
OpenFileDialog1.ShowDialog()
If OpenFileDialog1.FileName "" Then
Me.TextBox1.Text = OpenFileDialog1.FileName
End If
End Sub
End Class
将以下代码保存到模块中：
Declare Function GetPrivateProfileString Lib "kernel32" Alias _
"GetPrivateProfileStringA" (ByVal lpApplicationName As String, _
ByVal lpKeyName As Any, _
ByVal lpDefault As String, _
ByVal lpReturnedString As String, _
ByVal nSize As Long, _
ByVal lpFileName As String) As Long
Declare Function WritePrivateProfileStringByKeyName Lib "kernel32" Alias _
"WritePrivateProfileStringA" (ByVal lpApplicationName As String, _
ByVal lpKeyName As String, _
ByVal lpString As String, _
Public Function GetIniParam(NomFichier As String, NomSection As String, NomVariable As String) As String
Dim ReadString As String * 255
Dim returnv As String
Dim mResultLen As Integer
mResultLen = GetPrivateProfileString(NomSection, NomVariable, "(Unassigned)", ReadString, Len(ReadString) - 1, NomFichier)
If IsNull(ReadString) Or Left$(ReadString, 12) = "(Unassigned)" Then
Dim Tempvalue As Variant
Dim Message As String
Message = "配置文件 " NomFichier " 不存在."
returnv = ""
Else
returnv = Left$(ReadString, InStr(ReadString, Chr$(0)) - 1)
End If
GetIniParam = returnv
End Function
Public Function WriteWinIniParam(NomDuIni As String, sLaSection As String, sNouvelleCle As String, sNouvelleValeur As String)
Dim iSucccess As Integer
iSucccess = WritePrivateProfileStringByKeyName(sLaSection, sNouvelleCle, sNouvelleValeur, NomDuIni)
If iSucccess = 0 Then
WriteWinIniParam = False
Else
WriteWinIniParam = True
End If
End Function
调用方法：
Call WriteWinIniParam(App.Path "\LiveUpdate.ini", "LiveUpdate", "AppName", txtAppName.Text)
txtFile.Text = GetIniParam(App.Path "\LiveUpdate.ini", "LiveUpdate", "FILES1")