key enc dec.frm

一个比较简单的加密程序

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Key Encrypt Decrypt"
   ClientHeight    =   1215
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   4605
   Icon            =   "Key Enc Dec.frx":0000
   LinkTopic       =   "Form1"
   ScaleHeight     =   1215
   ScaleWidth      =   4605
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command3 
      Caption         =   "&Encrypt"
      Height          =   495
      Left            =   1680
      TabIndex        =   3
      Top             =   600
      Width           =   1215
   End
   Begin VB.CommandButton Command2 
      Caption         =   "E&xit"
      Height          =   495
      Left            =   120
      TabIndex        =   2
      Top             =   600
      Width           =   1215
   End
   Begin VB.CommandButton Command1 
      Caption         =   "&Decrypt"
      Height          =   495
      Left            =   3240
      TabIndex        =   1
      Top             =   600
      Width           =   1215
   End
   Begin VB.TextBox Text1 
      Height          =   375
      Left            =   120
      TabIndex        =   0
      Top             =   120
      Width           =   4335
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Public Function Encrypt(ByVal Plain As String)
    Dim Letter As String
    For I = 1 To Len(Plain)
        Letter = Mid$(Plain, I, 1)
        Mid$(Plain, I, 1) = Chr(Asc(Letter) + 1)
    Next I
    Encrypt = Plain
End Function
Public Function Decrypt(ByVal Encrypted As String)
Dim Letter As String
    For I = 1 To Len(Encrypted)
        Letter = Mid$(Encrypted, I, 1)
        Mid$(Encrypted, I, 1) = Chr(Asc(Letter) - 1)
    Next I
    Decrypt = Encrypted
End Function
Private Sub Command1_Click()
Text1 = Decrypt(Text1)
End Sub
Private Sub Command2_Click()
Unload Me
End Sub
Private Sub Command3_Click()
Text1 = Encrypt(Text1)
End Sub