Membuat Program Aplikasi Kriptografi Gronsfeld Pada VB.Net Sunday, January 12, 20140 komentar

Public Class Kriptografi_Gronsfeld

    Private Sub Kriptografi_Gronsfeld_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        plainteks.Text = ""
        kunci.Text = ""
        chiperteks.Text = ""
    End Sub

    Private Sub btnenkripsi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnenkripsi.Click
        Dim j As Integer
        Dim jum As Integer
        Dim sKey As String
        Dim nKata As Integer
        Dim nKunci As Integer
        Dim sKata As String
        Dim sPlain As String = ""
        Dim nEnc As Integer
        j = 0
        sKata = plainteks.Text
        jum = Len(sKata)
        sKey = kunci.Text
        For i = 1 To jum
            If j = Len(sKey) Then
                j = 1
            Else
                j = j + 1
            End If
            nKata = Asc(Mid(sKata, i, 1)) - 65

            nKunci = Asc(Mid(sKey, j, 1)) - 48

            nEnc = ((nKata + nKunci) Mod 26)
            sPlain = sPlain & Chr((nEnc) + 65)
        Next i
        chiperteks.Text = sPlain
    End Sub

    Private Sub plainteks_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles plainteks.KeyPress
        If ((e.KeyChar >= "0" And e.KeyChar <= "9") And e.KeyChar <> vbBack) Then e.Handled = True
    End Sub

    Private Sub kunci_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles kunci.KeyPress
        If Not ((e.KeyChar >= "0" And e.KeyChar <= "9") Or e.KeyChar = vbBack) Then e.Handled = True
    End Sub
End Class