caesar chiper

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 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