Kriptografi Caesar

 

Public Class Form1

    Private Sub Btnenkripsi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnenkripsi.Click
        Dim x As String = ""
        Dim xkalimat As String = ""
        For i = 1 To Len(plain.Text)
            x = Mid(plain.Text, i, i)
            x = Chr(Asc(x) + 3)
            xkalimat = xkalimat + x
        Next
        chiper.text = xkalimat
    End Sub

    Private Sub Btnhapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btnhapus.Click
        plain.Text = ""
        chiper.Text = ""
    End Sub

    Private Sub Btndeskripsi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btndeskripsi.Click
        Dim x As String = ""
        Dim xkalimat As String = ""
        For i = 1 To Len(chiper.Text)
            x = Mid(chiper.Text, i, i)
            x = Chr(Asc(x) - 3)
            xkalimat = xkalimat + x
        Next
        plain.Text = xkalimat
    End Sub

End Class