KRIPTOGRAFI

 

Listing Program I

Public Class Form6

    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, 1)

            x = Chr(Asc(x) + 3)

            xkalimat = xkalimat + x

        Next

        CHIPER.Text = xkalimat

    End Sub

    Private Sub BTNDEKRIPSI_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BTNDEKRIPSI.Click

        Dim x As String = ""

        Dim xkalimat As String = ""

        For i = 1 To Len(CHIPER.Text)

            x = Mid(CHIPER.Text, i, 1)

            x = Chr(Asc(x) - 3)

            xkalimat = xkalimat + x

        Next

        PLAIN.Text = xkalimat

    End Sub

    Private Sub Form6_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    End Sub

End Class

 Listing Program II

Public Class Form7

Private Sub Form7_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

            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

Listing Program III

 

Public Class Form8

    Private Sub Form8_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 kunci_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles kunci.KeyPress

        If ((e.KeyChar >= "0" And e.KeyChar <= "9") And e.KeyChar <> vbBack) Then

            e.Handled = True

        End If

    End Sub

                            

    Private Sub kunci_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles kunci.TextChanged

    End Sub

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

        If Not ((e.KeyChar >= "0" And e.KeyChar <= "9") Or e.KeyChar = vbBack) Then

            e.Handled = True

        End If

    End Sub

    Private Sub chiperteks_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles chiperteks.TextChanged

    End Sub

End Class

selamat mencoba, bila ada kesalahan mohon bero komentar pada tempta yang telah disediakan,agara dapat segera diperbaiki

terima kasih http://mesran.blogspot.com/search?q=tugas+TI-M1213&x=0&y=0