Kriptografi Caesar Chiper

Contoh : Gambar Hasil enkripsi & deskripsi 

Public Class Form1

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        plaintext.Text = ""

        chipertext.Text = ""

    End Sub

    Private Sub btnenkripsi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnenkripsi.Click

        Dim x As String

        Dim bil As Integer

        chipertext.Text = ""

        For i = 1 To Len(plaintext.Text)

            x = Microsoft.VisualBasic.Mid(plaintext.Text, i, 1)

            bil = Asc(x)

            bil = bil + 3

            x = Chr(bil)

            chipertext.Text = chipertext.Text & x

        Next

    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(chipertext.Text)

            x = Mid(chipertext.Text, i, i)

            x = Chr(Asc(x) - 3)

            xkalimat = xkalimat + x

        Next

        plaintext.Text = xkalimat

    End Sub

End Class

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