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How to encrypt/decrypt selected cells in Excel?

Author: Sun Last Modified: 2020-06-02

In some cases, you may want to encrypt some cells for preventing the cells viewed by other users, how can you get it done quickly? Now in this article, I introduce the tricks to quickly encrypt and decrypt selected cell contents in Excel.

Encrypt or decrypt selected cells with VBA

Encrypt or decrypt select cells with Kutools for Excel good idea3

Encrypt or decrypt selected cells with VBA

Here is a VBA code that can quickly encrypt or decrypt selected cells in Excel.

1. Press Alt + F11 keys to display Microsoft Visual Basic for Applications window.

2. Click Insert > Module, and paste below VBA code to the new Module window.

VBA: Encrypt or decrypt selected cells.

Private Function StrToPsd(ByVal Txt As String) As Long
    Dim xVal As Long
    Dim xCh As Long
    Dim xSft1 As Long
    Dim xSft2 As Long
    Dim I As Integer
    Dim xLen As Integer
    xLen = Len(Txt)
    For I = 1 To xLen
        xCh = Asc(Mid$(Txt, I, 1))
        xVal = xVal Xor (xCh * 2 ^ xSft1)
        xVal = xVal Xor (xCh * 2 ^ xSft2)
        xSft1 = (xSft1 + 7) Mod 19
        xSft2 = (xSft2 + 13) Mod 23
    Next I
    StrToPsd = xVal
End Function
Private Function Encryption(ByVal Psd As String, ByVal InTxt As String, Optional ByVal Enc As Boolean = True) As String
    Dim xOffset As Long
    Dim xLen As Integer
    Dim I As Integer
    Dim xCh As Integer
    Dim xOutTxt As String
    xOffset = StrToPsd(Psd)
    Rnd -1
    Randomize xOffset
    xLen = Len(InTxt)
    For I = 1 To xLen
        xCh = Asc(Mid$(InTxt, I, 1))
        If xCh >= 32 And xCh <= 126 Then
            xCh = xCh - 32
            xOffset = Int((96) * Rnd)
            If Enc Then
                xCh = ((xCh + xOffset) Mod 95)
                xCh = ((xCh - xOffset) Mod 95)
                If xCh < 0 Then xCh = xCh + 95
            End If
            xCh = xCh + 32
            xOutTxt = xOutTxt & Chr$(xCh)
        End If
    Next I
    Encryption = xOutTxt
End Function
Sub EncryptionRange()
    Dim xRg As Range
    Dim xPsd As String
    Dim xTxt As String
    Dim xEnc As Boolean
    Dim xRet As Variant
    Dim xCell As Range
    On Error Resume Next
    xTxt = ActiveWindow.RangeSelection.Address
    Set xRg = Application.InputBox("Select a range:", "Kutools for Excel", xTxt, , , , , 8)
    Set xRg = Application.Intersect(xRg, xRg.Worksheet.UsedRange)
    If xRg Is Nothing Then Exit Sub
    xPsd = InputBox("Enter password:", "Kutools for Excel")
    If xPsd = "" Then
        MsgBox "Password cannot be empty", , "Kutools for Excel"
        Exit Sub
    End If
    xRet = Application.InputBox("Type 1 to encrypt cell(s);Type 2 to decrypt cell(s)", "Kutools for Excel", , , , , , 1)
    If TypeName(xRet) = "Boolean" Then Exit Sub
    If xRet > 0 Then
        xEnc = (xRet Mod 2 = 1)
        For Each xCell In xRg
            If xCell.Value <> "" Then
                xCell.Value = Encryption(xPsd, xCell.Value, xEnc)
            End If
    End If
End Sub

3. Then press F5 key to execute the VBA, and a dialog pops out for selecting cells to encrypt. See screenshot:
doc encrypt decrypt 1

4. Then click OK and enter password for the encrypted cells in another popped out dialog. See screenshot:
doc encrypt decrypt 2

5. Click OK, and then in the third dialog, type 1 to encrypt selected cells, if you want to decrypt cells, enter 2. See screenshot:
doc encrypt decrypt 3

6. Click OK, and the selected cells are encrypted. See screenshot:
doc encrypt decrypt 4

Encrypt or decrypt select cells with Kutools for Excel

With above method to encrypt or decrypt cells is a little complex, but if you have Kutools for Excel installed, you can use Encrypt Cells and Decrypt Cells utilities to quickly get it done.

Kutools for Excel, with more than 300 handy functions, makes your jobs more easier. 

After free installing Kutools for Excel, please do as below:

1. Select the cells you want to encrypt, and click Kutools Plus > Encrypt Cells. See screenshot:
doc encrypt decrypt 5

2. Then enter and confirm the password in the Encrypt Cells dialog, and choose one encrypting type in the Mask section. See screenshot:
doc encrypt decrypt 6

3. Click Ok or Apply, and now the selected cells are encrypted.
doc encrypt decrypt 7

If you need to decrypt the cells, select them and click Kutools Plus > Decrypt, and enter the password to decrypt them. See screenshot:

doc encrypt decrypt 8  doc kutools encrypt cells 5

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Comments (2)
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This comment was minimized by the moderator on the site
what to do if i forgot the password for first method ?
This comment was minimized by the moderator on the site
Thanks - very useful. A couple of low-importance questions from me. 1. Why do you prefix your variables with the character "x"? I'm not quite seeing what benefit this provides. 2. What does the "Sft" in "xSft1" and "xSft2" stand for?
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