Tugas Pemrograman Tentang Kriptografi (CAESAR CHIPER, GRONSFIELD ,VERNAM,VIGENERE ,DES,RC4 )

Pertama, kita mulai dengan Desain Form Menunya Sebagai berikut ;

Kemudian, Listing Programnya Sbb :

Public Class Form1

    Private Sub CaesarChiperToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CaesarChiperToolStripMenuItem.Click
        Caesar_Chiper.Show()

    End Sub

    Private Sub GronsfeldChipeToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GronsfeldChipeToolStripMenuItem.Click
        Gronsfeld_Chiper.Show()
    End Sub

    Private Sub VernamChiperToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles VernamChiperToolStripMenuItem.Click
        Vernam_Chiper.Show()
    End Sub

    Private Sub VigenereChiperToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles VigenereChiperToolStripMenuItem.Click
        Vigenere_Chiper.Show()
    End Sub

    Private Sub DESChiperToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DESChiperToolStripMenuItem.Click
        DES_Chiper.Show()
    End Sub

    Private Sub RC4ToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles RC4ToolStripMenuItem.Click
        RC_4.Show()
    End Sub

    Private Sub KeluarToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles KeluarToolStripMenuItem.Click
        Me.Close()
    End Sub

    Private Sub FileToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles FileToolStripMenuItem.Click

    End Sub

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

    End Sub
End Class

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Kemudian, bagian-bagian dari pada menu tersebut ;

1. Caesar Chiper
Tampilannya ;

Listing Program:

Public Class Caesar_Chiper

    Private Sub enkripsi_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(Plainteks.Text)
            x = Mid(Plainteks.Text, i, i)
            x = Chr(Asc(x) + 3)
            xkalimat = xkalimat + x
        Next
        Chiperteks.Text = xkalimat
    End Sub

    Private Sub deskripsi_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(Chiperteks.Text)
            x = Mid(Chiperteks.Text, i, i)
            x = Chr(Asc(x) - 3)
            xkalimat = xkalimat + x
        Next
        Plainteks.Text = xkalimat
    End Sub

    Private Sub hapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnHapus.Click
        Plainteks.Text = ""
        Chiperteks.Text = ""
    End Sub

    Private Sub keluar_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles BtnKeluar.Click
        Close()
    End Sub

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

    End Sub
End Class

2. Gronsfield Chiper

Tampilannya

Listing Program ;

Public Class Gronsfeld_Chiper
    Private Sub Gronsfeld_Chiper_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Input.Text = ""
        hasil.Text = ""
    End Sub

    Private Sub BtnHitung_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnHitung.Click
        Dim ind As Integer
        Dim huruf, kalimat As String
        Dim jumlah(25) As Integer
        kalimat = (Input.Text).ToUpper
        For x = 1 To Microsoft.VisualBasic.Len(kalimat)
            huruf = kalimat.Substring(x - 1, 1)
            If (huruf >= "A") And (huruf <= "Z") Then
                ind = Asc(huruf) - 65
                jumlah(ind) += 1
            End If
        Next
        hasil.Text = ""
        For i As Integer = 0 To 25
            huruf = Chr(i + 65)
            If jumlah(i) > 0 Then
                hasil.Text = hasil.Text & huruf & " = " & jumlah(i) & vbCrLf
            End If
        Next
    End Sub

    Private Sub BtnKeluar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnKeluar.Click
        Me.Close()
    End Sub
End Class

3.Vernam Chiper

Tampilannya ;

Listing Program

Public Class Vernam_Chiper

    Private Sub Vernam_Chiper_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

4. Vigenere Chiper

    Tampilannya ;

Listing Program ;

Public Class Vigenere_Chiper

    Private Sub BtnProses_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnProses.Click
        chiperteks.Text = Enkripsi(plainteks.Text, kunci.Text)
    End Sub
    Function Enkripsi(ByVal Teks As String, ByVal Kunci As String) As String
        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
        jum = Len(Teks)
        sPlain = ""
        sKey = Kunci
        sKata = Teks
        For i = 1 To jum
            If j = Len(sKey) Then
                j = 1
            Else
                j = j + 1
            End If
            nKata = Asc(Mid(sKata, i, 1))

            nKunci = Asc(Mid(sKey, j, 1))

            nEnc = ((nKata + nKunci) Mod 256)

            sPlain = sPlain & Chr((nEnc))
        Next i
        Enkripsi = sPlain
    End Function

    Private Sub BtnBersih_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnBersih.Click
        plainteks.Text = ""
        chiperteks.Text = ""
        kunci.Text = ""
    End Sub

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

    End Sub
End Class

5. DES Chiper

   Tampilannya ;

Listing Program:

Public Class DES_Chiper
    Private Sub Btn_enkripsi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Btn_enkript.Click
        Dim kunci As String, kunciChar As String, katabaru As String
        Dim Pos As Integer
        Dim i As Integer, Side1 As String, Side2 As String
        Dim nEnc As Integer
        Pos = 1
        For i = 1 To Len(Plaintext.Text)
            Plaintext.Text = Mid(Plaintext.Text, i, 1)
            key.Text = Mid(key.Text, Pos, 1)
            Chipertext.Text = Chipertext.Text & Chr(Asc(Of Char)() Xor Asc(key.Text))
            If Pos = Len(kunci) Then Pos = 0
            Pos = Pos + 1
        Next i
        If Len(Chipertext.Text) Mod 2 = 0 Then
            Side1 = StrReverse(Left(Chipertext.Text, (Len(Chipertext.Text) / 2)))
            Side2 = StrReverse(Right(Chipertext.Text, (Len(Chipertext.Text) / 2)))
            Chipertext.Text = Side1 & Side2
        End If
        nEnc = Chipertext.Text
    End Sub

End Class

6. RC4

    Tampilannya ;

LISTING PROGRAM ;

Public Class RC4

    Private Function Rc4(ByVal message As String, ByVal password As String) As String
        Dim s = Enumerable.Range(0, 256).ToArray
        Dim i, j As Integer
        For i = 0 To s.Length - 1
            j = (j + Asc(password(i Mod password.Length)) + s(i)) And 255
            Dim temp = s(i)
            s(i) = s(j)
            s(j) = temp
        Next
        i = 0
        j = 0
        Dim sb As New System.Text.StringBuilder(message.Length)
        For Each c As Char In message
            i = (i + 1) And 255
            j = (j + s(i)) And 255
            Dim temp = s(i)
            s(i) = s(j)
            s(j) = temp
            sb.Append(Chr(s((s(i) + s(j)) And 255) Xor Asc(c)))
        Next
        Return sb.ToString
    End Function

    Private Sub BtnEnkript_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BtnEnkript.Click
        Chipertext.Text = Rc4(Plaintext.Text, Key.Text)
    End Sub

End Class

Belajar Pemrograman Selengkapnya ;
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