Program Enkripsi Vernam (One Time Pad) Menggunakan VB Net

Written By Mesran on Kamis, 13 Juni 2013 | 09.09

Sebelumnya saya sudah membahas mengenai Kriptografi Vernam Chiper (One Time Pad), dan pada artikel ini saya akan memberikan program pembelajaran dari pemakaian kriptografi vernam tersebut.

Pada program saya mendesain hanya karakter saja yang bisa di terima.

Design dahulu form program enkripsi vernam (one time pad) menggunakan vb net, berikut ini

 

Berikut listing  program enkripsi vernam (one time pad) menggunakan vb net

Public Class OneTimePad

    Private Sub OneTimePad_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)) - 65

            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

        e.KeyChar = UCase(e.KeyChar)

        Dim tombol As Integer = Asc(e.KeyChar)

        If Not (((tombol >= 65) And (tombol <= 90)) Or (tombol = 8)) Then

            e.Handled = True

        End If

    End Sub

    Private Sub Kunci_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles Kunci.KeyPress

        e.KeyChar = UCase(e.KeyChar)

        Dim tombol As Integer = Asc(e.KeyChar)

        If Not (((tombol >= 65) And (tombol <= 90)) Or (tombol = 8)) Then

            e.Handled = True

        End If

    End Sub

End Class

Silahkan anda tekan F5, dan isikan data berikut :
Plainteks : SAYANGAKUCINTAKAMU
Kunci : ALDYAN
Chiperteks: SLBYNTAVXAIATLNYMH

Hasil form program enkripsi vernam (one time pad) menggunakan vb net