vb中文加密
㈠ vb编程，设计一个文本加密程序。输入一个字符串，按照以下规律加密“
'运行效果如上图，代码如下所示：
'判断中我将大小写字母均按规则进行了转换。
'原创，亲测可用，转发请说明出处。
PrivateSubCommand1_Click()
Dima,bAsString
a=Text1.Text
DimiAsInteger
i=Len(a)
Dimarr()AsString
ReDimarr(1Toi)
DimjAsInteger
Forj=1Toi
b=Mid(a,j,1)
IfAsc(b)>=97AndAsc(b)<=118Then
arr(j)=Chr(Asc(b)+4)
EndIf
IfAsc(b)=119Then
arr(j)="a"
EndIf
IfAsc(b)=120Then
arr(j)="b"
EndIf
IfAsc(b)=121Then
arr(j)="c"
EndIf
IfAsc(b)=122Then
arr(j)="d"
EndIf
IfAsc(b)>=65AndAsc(b)<=86Then
arr(j)=Chr(Asc(b)+4)
EndIf
IfAsc(b)=87Then
arr(j)="A"
EndIf
IfAsc(b)=88Then
arr(j)="B"
EndIf
IfAsc(b)=89Then
arr(j)="C"
EndIf
IfAsc(b)=90Then
arr(j)="D"
EndIf
IfAsc(b)<65OrAsc(b)>122Or(Asc(b)>90AndAsc(b)<97)Then
arr(j)=b
EndIf
Nextj
Text2.Text=Join(arr,"")
EndSub
㈡ 怎么用VB给文件夹加密
1、由于采用二进制读取文件的方式，因此加密时一般可以不考虑文件类型。
2、这里只进行一次异或运算，如有需要可以进行多次异或运算。
3、此加密算法速度快，当然加密强度也低 ；
参考代码如下：
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'-----------------------------------------------------------------------
'函数说明： 使用异或运算加密文件（可加密大部分文件）
'参数说明： key - 密钥
' fileName - 普通文件名，
' encryptFileName - 加密后的文件名
'返回值： true - 成功，false - 失败
'-----------------------------------------------------------------------
Private Function XOR_Encrypt(key As Integer, fileName As String, encryptFileName As String) As Boolean
On Error GoTo errHandler
Dim inputFileNo As Integer
Dim fileBytes() As Byte
Dim length As Long
XOR_Encrypt = False
'打开文件并保存在二进制数组中
inputFileNo = FreeFile
Open fileName For Binary As #inputFileNo
length = LOF(inputFileNo)
If length = 0 Then
MsgBox "退出加密：文件内容为空！", vbInformation, "提示"
Exit Function
End If
ReDim fileBytes(length - 1) As Byte
Get inputFileNo, , fileBytes()
Close #inputFileNo
'将该二进制数组进行异或加密
Dim i As Long
For i = LBound(fileBytes) To UBound(fileBytes)
fileBytes(i) = fileBytes(i) Xor key
Next
'将异或加密后的二进制数组保存在新的文件中
Dim outputFileNo As Integer
outputFileNo = FreeFile
Open encryptFileName For Binary As #outputFileNo
Put outputFileNo, , fileBytes
Close #outputFileNo
XOR_Encrypt = True
errHandler:
If Err.Number Then
MsgBox "加密过程中出错：" & Err.Description, vbCritical, "错误"
XOR_Encrypt = False
Resume Next
End If
End Function
㈢ 运用VB对文字进行加密解密
'这是我从网上找到的一段加密解密的代码，很不错，应该符合要求。
'文本框的multiline属性是用来设置是否可以接受多行文本，只能在窗体上手工设置。
'文本框的scrollbars属性是用来设置是否有垂直和水平滚动条的，也只能在窗体上手工设置。
'keyAscii不清楚是作什么用的。
'两个StrConv函数用的太好了，我没想到能处理的这么简单。
Option Explicit
Dim key() As Byte
Sub initkey() '这里为密匙，建议定义的复杂些，我这里仅仅是个示例
ReDim key(9)
key(0) = 12
key(1) = 43
key(2) = 53
key(3) = 67
key(4) = 78
key(5) = 82
key(6) = 91
key(7) = 245
key(8) = 218
key(9) = 190
End Sub
Function Pass_Encode(ByVal s As String) As String '加密
On Error GoTo myerr
initkey
Dim buff() As Byte
buff = StrConv(s, vbFromUnicode)
Dim i As Long, j As Long
Dim k As Long
k = UBound(key) + 1
For i = 0 To UBound(buff)
j = i Mod k
buff(i) = buff(i) Xor key(j)
Next
Dim mstr As String
mstr = ""
Dim outstr As String
Dim temps As String
For i = 0 To UBound(buff)
k = buff(i) \ Len(mstr)
j = buff(i) Mod Len(mstr)
temps = Mid(mstr, j + 1, 1) + Mid(mstr, k + 1, 1)
outstr = outstr + temps
Next
Pass_Encode = outstr
Exit Function
myerr:
Pass_Encode = ""
End Function
Function Pass_Decode(ByVal s As String) As String '解密
On Error GoTo myerr
initkey
Dim i As Long, j As Long
Dim k As Long, n As Long
Dim mstr As String
mstr = ""
Dim outstr As String
Dim temps As String
If Len(s) Mod 2 = 1 Then
Pass_Decode = ""
Exit Function
End If
Dim t1 As String
Dim t2 As String
Dim buff() As Byte
Dim m As Long
m = 0
For i = 1 To Len(s) Step 2
t1 = Mid(s, i, 1)
t2 = Mid(s, i + 1, 1)
j = InStr(1, mstr, t1)
k = InStr(1, mstr, t2)
n = j - 1 + (k - 1) * Len(mstr)
ReDim Preserve buff(m)
buff(m) = n
m = m + 1
Next
k = UBound(key) + 1
For i = 0 To UBound(buff)
j = i Mod k
buff(i) = buff(i) Xor key(j)
Next
Pass_Decode = StrConv(buff, vbUnicode)
Exit Function
myerr:
Pass_Decode = ""
End Function
Private Sub Command1_Click()
Text2.Text = Pass_Encode(Text1.Text)
Text3.Text = Pass_Decode(Text2.Text)
End Sub
㈣ VB文本加密解密
刚好以前写过一篇文章，提取了一部分
对敏感的数据进行加密是必要的，如用户的密码的加密。在要对数据进行加密前得确定要用何种加密方式，加密分类有很多种，从可逆角度可分为可逆和不可逆，从加密算法可分为秘密密钥算法、公开密钥算法（用于加密、数据签名和密钥管理）以及单向散列函数等。md5加密是不可逆的，md5加密的具体实现又分为许多种。
加密为什么要采用不可逆？举个例子，当你输入的密码进行加密的密文被截取，那他也要把密文解密成原文，这时由于不可逆，那他要破解密码的难度就提高，除非他可以越过加密那一步直接提供密文，这样就达到安全的目的。每当我们忘记密码进行找回密码，大多数网站要求我们输入新的密码而不是直接告诉我们原来的密码，这是由于不可逆造成的，但这又不是坏处，为什么这么说？如果在找回密码时能够知道原来的密码，那么卧底就不用修改密码来监控所有人，而所有人又不知情。但并不是所有网站都采用不可逆的算法，笔者在某网站注册过用户，有一段没登录过，那网站就会给笔者一份提醒邮件，而这提醒邮件又显示着笔者的密码，这很可能是这个网站采用的不是不可逆的算法。
今天为一个网友实现了一个简易的自定义加密方式，使用的是Visual Basic 6.0。关键代码如下：
Dim decode As String, encode As String, oldString As String, newString As String
Dim i As Integer
decode = "1234567890" '加密原文对照字符，不应该出错相同的字符
encode = "eoSDriKjsd" '加密成密文的对照字符，字符个数不能少于decode，否则极易造成出错
oldString = "87232" '待加密的字符串，所有字符都必需能够在decode里找到对应位置
newString = "" '存放加密后的字符串
For i = 1 To Len(oldString)
newString = newString + Mid$(encode, Instr(decode, Mid$(oldString, i, 1)), 1)
Next i
Print "原文："; oldString
Print "密文："; newString
decode和encode的值可以根据需要设置，oldString可以由文框输入，如果encode里的字符俩俩不相同，那么只需调换decode和encode的值，就可以实现解密，否则加密后的密文为不可逆。
当然，在实际的应用种应增加加密的算法复杂度，让密文不至于被人轻而易举破解。更多的加密知识请参考相关文档。
希望回答对你有帮助
㈤ vb中如何对字符串进行加密和解密（有汉字的）
源程序如下：
Public Function StringEnDeCodecn(strSource As String, MA) As String
'该函数只对中西文起到加密作用
'参数为：源文件，密码
On Error GoTo ErrEnDeCode
Dim X As Single
Dim CHARNUM As Long, RANDOMINTEGER As Integer
Dim SINGLECHAR As String * 1
Dim strTmp As String
If MA < 0 Then
MA = MA * (-1)
End If
X = Rnd(-MA)
For i = 1 To Len(strSource) Step 1 '取单字节内容
SINGLECHAR = Mid(strSource, i, 1)
CHARNUM = Asc(SINGLECHAR)
g: RANDOMINTEGER = Int(127 * Rnd)
If RANDOMINTEGER < 30 Or RANDOMINTEGER > 100 Then GoTo g
CHARNUM = CHARNUM Xor RANDOMINTEGER
strTmp = strTmp & Chr(CHARNUM)
Next i
StringEnDeCodecn = strTmp
Exit Function
ErrEnDeCode:
StringEnDeCodecn = ""
MsgBox Err.Number & "\" & Err.Description
End Function
使用方法：
tmp=stringEnDecn("中华人民共和国",75)
如果要解密的话，只须键入以下语句：
tmp1=stringendecn(tmp,75)
㈥ 怎样用VB给文件夹进行密码加密
文件或文件夹的加密、解密
'此方法对 WinXP 系统有效，Win98 没试验过。小心：不能用于系统文件或文件夹，否则会使系统瘫痪。
'加密：利用 API 函数在文件或文件夹名称末尾添上字符“..\”。比如，将文件夹“MyPath”更名为“MyPath..\”，在我的电脑中显示的名称就是“MyPath.”。系统会无法识别，此文件或文件夹就无法打开和修改，也无法删除。着名的病毒 Autorun 就是玩的这个小把戏。
'解密：去掉文件或文件夹名称末尾的字符“..\”
'将以下代码复制到 VB 的窗体代码窗口即可
'例子需控件：Command1、Command2、Text1，均采用默认属性设置
Private Const MAX_PATH = 260
Private Type FileTime ' 8 Bytes
LTime As Long
HTime As Long
End Type
Private Type Win32_Find_Data
dwFileAttributes As Long
ftCreationTime As FileTime
ftLastAccessTime As FileTime
ftLastWriteTime As FileTime
nFileSizeHigh As Long
nFileSizeLow As Long
dwReserved0 As Long
dwReserved1 As Long
cNameFile As String * MAX_PATH
cAlternate As String * 14
End Type
Private Declare Function MoveFileEx Lib "kernel32" Alias "MoveFileExA" (ByVal lpExistingFileName As String, ByVal lpNewFileName As String, ByVal dwFlags As Long) As Long
Private Declare Function GetShortPathName Lib "kernel32" Alias "GetShortPathNameA" (ByVal lpszLongPath As String, ByVal lpszShortPath As String, ByVal cchBuffer As Long) As Long
Private Declare Function FindFirstFile Lib "kernel32" Alias "FindFirstFileA" (ByVal lpNameFile As String, lpFindFileData As Win32_Find_Data) As Long
Private Declare Function FindNextFile Lib "kernel32" Alias "FindNextFileA" (ByVal hFindFile As Long, lpFindFileData As Win32_Find_Data) As Long
Private Declare Function FindClose Lib "kernel32" (ByVal hFindFile As Long) As Long
Private Sub Form_Load()
Text1.Text = "C:\MyPath"
Command1.Caption = "解密": Command2.Caption = "加密"
Me.Caption = "目录或文件的加解密"
End Sub
Private Sub Command1_Click()
Call SetPathName(False) '解密
End Sub
Private Sub Command2_Click()
Call SetPathName(True) '加密
End Sub
Private Sub SetPathName(SetMi As Boolean)
Dim nName As String, NewName As String, nSort As String, nCap As String, dl As Long
nName = Trim(Text1.Text)
If Right(nName, 3) = "..\" Then nName = Left(nName, Len(nName) - 3)
If Right(nName, 1) = "\" Then nName = Left(nName, Len(nName) - 1)
If SetMi Then
NewName = nName & "..\"
Else
NewName = nName
nName = nName & "..\"
End If
If SetMi Then nCap = "加密" Else nCap = "解密"
nSort = GetShortName(nName) '转变其中的 ..\
If nSort = "" Then
MsgBox "文件没有找到：" & vbCrLf & nName, vbCritical, nCap
Exit Sub
End If
If MoveFileEx(nSort, NewName, 0) = 0 Then Exit Sub '文件更名：非零表示成功，支持只读文件
MsgBox nCap & "成功：" & vbCrLf & nName, vbInformation, nCap
End Sub
Public Function GetShortName(F As String, Optional ShortAll As Boolean) As String
'转变为短文件名，如果目录或文件不存在就返回空。可用于判断某目录或文件是否存在
'不能直接用 API 函数 GetShortPathName， 因它不支持 ..\
'ShortAll=T 表示全部转变为短名称，否则只转变其中的点点杠“..\”
Dim FondID As Long, ID1 As Long, S As Long, nPath As String
Dim nF As String, InfoF As Win32_Find_Data, qF As String, hF As String
Dim nName As String, nName1 As String
nF = F
Do
S = InStr(nF, "..\")
If S = 0 Then Exit Do
qF = Left(nF, S + 2): hF = Mid(nF, S + 3) '分为前后两部分
CutPathName qF, nPath, nName
nName = LCase(nName)
qF = nPath & "\" & "*."
FondID = FindFirstFile(qF, InfoF) '-1表示失败。查找所有文件（夹）
ID1 = FondID
Do
If FondID = Find_Err Or ID1 = 0 Then GoTo Exit1 '没有找到符合条件的条目
nName1 = LCase(CutChr0(InfoF.cNameFile)) '文件（夹）名称
If nName1 & ".\" = nName Then
nName1 = CutChr0(InfoF.cAlternate) '用短文件名代替
If hF = "" Then nF = nPath & "\" & nName1 Else nF = nPath & "\" & nName1 & "\" & hF
Exit Do
End If
ID1 = FindNextFile(FondID, InfoF) '查找下一个，0表示失败
Loop
FindClose FondID
Loop
Exit1:
FindClose FondID
S = MAX_PATH: nName = String(S, vbNullChar)
ID1 = GetShortPathName(nF, nName, S) '返回实际字节数，0表示失败
If ID1 = 0 Then Exit Function
If ShortAll Then
If ID1 > S Then
S = ID1: nName = String(S, vbNullChar)
ID1 = GetShortPathName(nF, nName, S) '返回实际字节数
End If
GetShortName = CutChr0(nName)
Else
GetShortName = nF
End If
End Function
Public Sub CutPathName(ByVal F As String, nPath As String, nName As String)
Dim I As Long, LenS As Long
LenS = Len(F)
For I = LenS - 1 To 2 Step -1
If Mid(F, I, 1) = "\" Then
nPath = Left(F, I - 1): nName = Mid(F, I + 1)
GoTo Exit1
End If
Next
nPath = F: nName = ""
Exit1:
If Right(nPath, 2) = ".." Then
nPath = nPath & "\"
Else
If Right(nPath, 1) = "\" Then nPath = Left(nPath, Len(nPath) - 1)
End If
If Right(nName, 1) = "\" And Right(nName, 3) <> "..\" Then nName = Left(nName, Len(nName) - 1)
End Sub
Private Function CutChr0(xx As String) As String
Dim S As Long
S = InStr(xx, vbNullChar)
If S > 0 Then CutChr0 = Left(xx, S - 1) Else CutChr0 = xx
End Function
'参考资料见下
㈦ 怎样用VB编写一个文件加密程序
字节逐位倒排序加密法是以比特为单位的换位加密方法，用VB实现的具体算法是：
(1) 以二进制模式打开源文件；
(2) 从源文件第I位读取一个字节，假设为字母“A”，得到“A”的ASCII值为65；
(3) 将65转换成八位二进制串为“01000001”；
(4) 将“01000001”按字节逐位倒排序得另一个八位二进制串“10000010”；
(5) 将“10000010”转换成十进制再写回源文件第I位置，完成一个字节的加密；
(6) 重复(2)、(3)、(4)和(5)，直到所有字节加密结束。
为了使程序模块化，我们用函数过程ByteToBin完成将字节型数据转换成二进制串（其实质就是将十进制数转换成八位二进制串）；用函数过程BinToByte将二进制串转换成字节型数据（实质是将八位二进制串转换成十进制数）：用函数过程Reverse将八位二进制串逐位倒排序。具体程序如下：
Function ByteToBin(m As Byte) As String ' 将字节型数据转换成八位二进制字符串
Dim c$
c$ = ""
Do While m <> 0
r = m Mod 2
m = m \ 2
c$ = r & c$
Loop
c$ = Right("00000000" & c$, 8)
ByteToBin = c$
End Function
Function Reverse(m As String) As String ' 将八位二进制字符串颠倒顺序
Dim i%, x$
x = ""
For i = 1 To 8
x = Mid(m, i, 1) & x
Next i
Reverse = x
End Function
Function BinToByte(m As String) As Byte ' 将八位二进制串转换成十进制
Dim x As String * 1, y%, z%
z = 0
For i = 1 To 8
x = Mid(m, i, 1)
y = x * 2 ^ (8 - i)
z = z + y
Next i
BinToByte = z
End Function
Private Sub Command1_Click()
Dim x As Byte, i%, fname$
fname = InputBox("请输入要加密的文件名！注意加上路径名：")
If Dir(fname) = "" Then
MsgBox "文件不存在！"
Exit Sub
End If
Open fname For Binary As #1 ' 以二进制访问模式打开待加悔穗扒密文件
For i = 1 To LOF(1) ' LOF函数是求文件长度的内部函数
Get #1, i, x ' 取出第i个字节
x = BinToByte(Reverse(ByteToBin(x))) ' 这里调用了三个自定义函数
Put #1, i, x ' 将加密后的这个字节写回到文件原位置
Next i
Close
MsgBox "任务完成！"
End Sub
本例可以完成对任意文件的加密与解密，对同一文件作第一次处理为加密，第二次处理为解族搭密。要调试本程序，碧昌可用记事本在C盘根目录下任意建立一个文本文件（假设为文件名为aaa.txt），其中的内容任意（可以包括字母、汉字、数字、回车符、换行符等）。运行本程序后，在输入文件名的对话框中输入文件名（如：“C:\aaa.txt”）后回车，即可完成对文件的加密。文件加密后，可以在记事本中打开该文件查看加密效果。如果想解密，可再次运行该程序并输入相同文件名。
㈧ 使用VB作出加密，解密并显示密钥
'这是我以前回答别人提问时写的，添加三个文本框，一个按钮。text3文本框中输入要加密的
'文本，在text2中是加密的文本，在text1中是对加密的文本解密。加密和解密用同一个
'过程'Private Function JiaMi(a As String) As String
Private Sub Command1_Click()
Dim a As String
Dim b As String
a = Text3
For i = 1 To Len(a)
b = b & JiaMi(Mid(a, i, 1))
Next i
Text2 = b
a = Text2
b = ""
For i = 1 To Len(a)
b = b & JiaMi(Mid(a, i, 1))
Next i
Text1 = b
End Sub
Private Function JiaMi(a As String) As String
Dim IntAsc As Integer
IntAsc = Asc(a)
If IntAsc Mod 2 Then
IntAsc = IntAsc + 47
If IntAsc > 126 Then IntAsc = IntAsc - 47
Else
IntAsc = IntAsc - 47
If IntAsc < 33 Then IntAsc = IntAsc + 47
End If
JiaMi = Chr(IntAsc)
End Function