METODE KRIPTOGRAFI

Tampilan Menu Awal:

  

Syntaxnya:

PublicClass Form1

PrivateSub KeluarToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles KeluarToolStripMenuItem.Click

End

EndSub

PrivateSub CaesarChToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CaesarChToolStripMenuItem.Click

        caesar_chiper.Show()

EndSub

PrivateSub VernamChiperToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles VernamChiperToolStripMenuItem.Click

        vernam_chiper.Show()

EndSub

PrivateSub VigenereChiperToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles VigenereChiperToolStripMenuItem.Click

        vigenere_chiper.Show()

EndSub

PrivateSub DesChiperToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles AutoKeyChiperToolStripMenuItem.Click

        autokey_chiper.Show()

EndSub

PrivateSub GronsfeldChiperToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles GronsfeldChiperToolStripMenuItem.Click

        Des_chiper.Show()

EndSub

PrivateSub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) HandlesMyBase.Load

EndSub

EndClass.

Tampilan Menu  Autokey_chiper :

Syntaxnya:

PublicClass autokey_chiper

PrivateSub autokey_chiper_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) HandlesMyBase.Load

        plaintext.Text = ""

        kunci.Text = ""

        chipertext.Text = ""

EndSub

PrivateFunction AutokeyEncipher(ByVal strPlaintext AsString, ByRef strKey AsString) AsString

Dim i AsLong

Dim j AsLong

Dim c1 AsInteger

Dim strPlaintext2 AsString

Dim strKey2 AsString

Dim strCiphertext AsString

Dim strCiphertext2 AsString

Dim diffKeyLen AsInteger

Dim pAlphabet AsInteger

Dim cAlphabet AsInteger

Dim nShift AsInteger

'1. Hilangkan semua karakter yang bukan alfabet dari strPlaintext

' dan simpan sebagai strPlaintext2

        strPlaintext2 = ""

For i = 1 To strPlaintext.Length

            c1 = Asc(Mid(strPlaintext, i, 1))

If (c1 >= 65 And c1 <= 90) Then

                strPlaintext2 = strPlaintext2 & Chr(c1)

EndIf

Next i

'2. Hilangkan semua karakter yang bukan alfabet dari strKey

' dan simpan sebagai strKey2

        strKey2 = ""

For i = 1 To strKey.Length

            c1 = Asc(Mid(strKey, i, 1))

If (c1 >= 65 And c1 <= 90) Then

                strKey2 = strKey2 & Chr(c1)

EndIf

Next i

'3. Susun kunci baru strKey2 berdasarkan kunci awal strKey kemudian

' ditambah plaintext

'perbedaan antara panjang plaintext dan kunci

        diffKeyLen = strPlaintext2.Length - strKey2.Length

For i = 1 To diffKeyLen

'c1 = Asc(Mid(strPlaintext2, i, 1))

            strKey2 = strKey2 & Mid(strPlaintext2, i, 1)

Next i

'4. Geser masing-masing huruf pada plaintext

' dengan huruf yang terkait pada key

        strCiphertext = ""

For i = 1 To strPlaintext2.Length

            c1 = Asc(Mid$(strPlaintext2, i, 1))

            nShift = Asc(Mid$(strKey2, i, 1)) - 65

If ((c1 >= 65) And (c1 <= 90)) Then

                pAlphabet = c1 - 65 ' get the alphabet sequence

                cAlphabet = (pAlphabet + nShift) Mod 26 ' shifted alphabet

                c1 = cAlphabet + 65 ' get character in 65 ... 90

EndIf

            strCiphertext = strCiphertext & Chr(c1)

Next i

'5. Susun strCiphertext sesuai dengan urutan strPlaintext

        strCiphertext2 = ""

        strKey = ""

        j = 1

For i = 1 To strPlaintext.Length

            c1 = Asc(Mid$(strPlaintext, i, 1))

If ((c1 >= 65) And (c1 <= 90)) Then

                strCiphertext2 = strCiphertext2 & Mid(strCiphertext, j, 1)

                strKey = strKey & Mid(strKey2, j, 1)

                j = j + 1

Else

                strCiphertext2 = strCiphertext2 & Chr(c1)

                strKey = strKey &" "

EndIf

Next i

Return strCiphertext2

EndFunction

PrivateSub btnkeluar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnkeluar.Click

Me.Close()

EndSub

PrivateSub btnhapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnhapus.Click

        plaintext.Text = ""

        kunci.Text = ""

        chipertext.Text = ""

EndSub

PrivateSub btnenkripsi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btn_Encipher.Click

        chipertext.Text = AutokeyEncipher(plaintext.Text, kunci.Text)

EndSub

PrivateSub plaintext_TextChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles plaintext.TextChanged

EndSub

EndClass.

Tampilan Menu Caesar_chiper :

                                                                                                             

Syntaxnya:

PublicClass caesar_chiper

PrivateSub caesar_chiper_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) HandlesMyBase.Load

        plaintext.Text = ""

        chipertext.Text = ""

EndSub

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

Dim jumlah AsDouble = Len(plaintext.Text)

Dim x AsString

Dim xkalimat AsString = ""

Dim i AsDouble

Dim bil AsInteger

For i = 1 To jumlah

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

            bil = Asc(x) + 3

            x = Chr(bil)

            xkalimat = xkalimat + x

Next i

        chipertext.Text = xkalimat

EndSub

PrivateSub btnhapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnhapus.Click

        plaintext.Text = ""

        chipertext.Text = ""

EndSub

PrivateSub btnkeluar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)

End

EndSub

PrivateSub btnkeluar_Click_1(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnkeluar.Click

Me.Close()

EndSub

EndClass

Tampilan Menu  Des_chiper :

Syntaxnya:

PublicClass Des_chiper

PrivateSub Des_chiper_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) HandlesMyBase.Load

        plain.Text = ""

        chip.Text = ""

EndSub

PrivateSub deskripsi_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles deskripsi.Click

Dim x AsString = ""

Dim xkalimat AsString = ""

For i = 1 To Len(chip.Text)

            x = Mid(chip.Text, i, i)

            x = Chr(Asc(x) - 3)

            xkalimat = xkalimat + x

Next

        plain.Text = xkalimat

EndSub

PrivateSub hapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles hapus.Click

        plain.Text = ""

        chip.Text = ""

EndSub

PrivateSub keluar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles keluar.Click

Me.Close()

EndSub

EndClass.

Tampilan Menu Vernam_chiper :

                                                                                                         

Syntaxnya:

PublicClass vernam_chiper

PrivateSub vernam_chiper_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) HandlesMyBase.Load

        plaintext.Text = ""

        kunci.Text = ""

        chipertext.Text = ""

EndSub

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

Dim j AsInteger

Dim jum AsInteger

Dim sKey AsString

Dim nKata AsInteger

Dim nKunci AsInteger

Dim sKata AsString

Dim sPlain AsString = ""

Dim nEnc AsInteger

        j = 0

        sKata = plaintext.Text

        jum = Len(sKata)

        sKey = kunci.Text

For i = 1 To jum

If j = Len(sKey) Then

                j = 1

Else

                j = j + 1

EndIf

            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

        chipertext.Text = sPlain

EndSub

PrivateSub plaintext_KeyPress(ByVal sender AsObject, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles plaintext.KeyPress

        e.KeyChar = UCase(e.KeyChar)

Dim tombol AsInteger = Asc(e.KeyChar)

IfNot (((tombol >= 65) And (tombol <= 90)) Or (tombol = 8)) Then

            e.Handled = True

EndIf

EndSub

PrivateSub kunci_KeyPress(ByVal sender AsObject, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles kunci.KeyPress

        e.KeyChar = UCase(e.KeyChar)

Dim tombol AsInteger = Asc(e.KeyChar)

IfNot (((tombol >= 65) And (tombol <= 90)) Or (tombol = 8)) Then

            e.Handled = True

EndIf

EndSub

PrivateSub btnhapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnhapus.Click

        plaintext.Text = ""

        kunci.Text = ""

        chipertext.Text = ""

EndSub

PrivateSub btnkeluar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnkeluar.Click

Me.Close()

EndSub

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

EndSub

EndClass.

Tampilan Menu Vigenere_chiper :

                                                                                                              

Syntaxnya:

PublicClass vigenere_chiper

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

        chipertext.Text = Enkripsi(plaintext.Text, kunci.Text)

EndSub

Function Enkripsi(ByVal Teks AsString, ByVal Kunci AsString) AsString

Dim j AsInteger

Dim jum AsInteger

Dim sKey AsString

Dim nKata AsInteger

Dim nKunci AsInteger

Dim sKata AsString

Dim sPlain AsString

Dim nEnc AsInteger

        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

EndIf

            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

EndFunction

PrivateSub btnhapus_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnhapus.Click

        plaintext.Text = ""

        kunci.Text = ""

        chipertext.Text = ""

EndSub

PrivateSub btnkeluar_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnkeluar.Click

Me.Close()

EndSub

PrivateSub vigenere_chiper_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) HandlesMyBase.Load

EndSub

EndClass.