Encryptor transposition cipher

Itself is a very weak mono-alphabetic substitution cipher. The Russian Nihilist cipher used a keyword scrambled Polybius square where the plaintext digits are added to a fixed number of digits, derived by a keyword from the square. It was basically a pimped Vigenère encryption and simple to break. Fractionation should only be used in combination with other techniques. Always fractionate the letters before transpositioning them, preferably an irregular fractionation followed by a double (disrupted) transposition. This combination is one of the strongest manual ciphers. The Straddling Checkerboard An important Russian improvement to the fractionation of the Nihilist cipher is the straddling checkerboard. Letters in a normal matrix are broken up into ever equal parts. The checkerboard however produces a most irregular pattern. Some letters are represented by one digit, others by two digits. By assigning the most frequent letters to one-digit values the resulting ciphertext will be smaller than a normal Nihilist cipher. Also, the irregular pattern of digits makes it much more difficult to retrieve the matrix combinations. As a further complication one could fill the matrix with a scrambled alphabet instead of the default alphabetic sequence. The combination of fractionation and transposition proved to be very secure. A good example of such a combination is the VIC Cipher with double transposition and straddling checkerboard, used by Russian intelligence during the Cold War. The cipher resisted all cryptanalytic attacks for several years until the Soviet agent who used it defected to the United States. A straddling checkerboard matrix, with

T H E D O C . . . . . . . . . C l s e n d f u r t U M . . . . . . . . U M h e r i n s t r E N T . . . . . . . E N T u c t i o n s S A N D . - - - - - S A N D x - - - - - Usually, the disruption method is used in one of the two transpositions of a double transposition, making it much stronger. Probably the most powerful German wartime hand ciphers was Rasterschlüssel 44, a grid-based cipher that disrupted the text rows by a grid, followed by columnar transposition. Fractionation Ciphers that are based purely on transposition reveal statistical information when subjected to letter frequency analysis. Breaking up or fractionating letters before moving them around improves the security of a cipher considerably. A simple matrix can break up letters into a horizontal and vertical coordinate. This Polybius square is the easiest way to apply fractionation on plaintext. A scrambled alphabet can be used to complicate the matrix. Of course, fractionation offers no cryptographic strength unless combined with other techniques. 1 2 3 4 5 1 A B C D E 2 F G H I/J K 3 L M N O P 4 Q R S T U 5 V W X Y Z The Polybius square on

One-digit values optimized for the English language: | 0 1 2 3 4 5 6 7 8 9 +--------------------- | A T O N E S I R 2| B C D F G H J K L M 6| P Q U V W X Y Z .fig To convert figures, we use "FIG" before and after the digits and write out each digit three times to exclude errors. Let us convert some text with the checkerboard Plaintext : p l e a s e c o n t a c t m e a t [fig] 1 2 0 0 [fig] h conversion: 60 28 5 0 7 5 21 3 4 1 0 21 1 29 5 0 1 69 111 222 000 000 69 25 68 In groups, completed with zero's: 60285 07521 34102 11295 01691 11222 00000 06925 68000 It's easy to convert the digits back into characters and separate the one-digit values from the two-digit values. If a digit combination starts with a row number (2 or 6) it's a two-digit code and another digit follows. In all other cases it's a one-digit code. Again, this fractionation method should always be used in combination with other cipher techniques such as transpositions or a one-time pad. After converting the text into digits one can transposition them or add a one-time pad. If used with a transposition, we simply transpose digits instead of letter as we do with the double transposition cipher. Remember, a checkerboard on

Transposition Cipher ada 2 jenis:Columnar TranspositionRail Fence Cipher / Zig Zag CipherColumnar Transposition:Kunci ialah satu perkataan. Contohnya BUAH, UMPAN, MESIN (biasanya perkataan yang dipilih sebagai kunci,tidak mempunyai abjad yang berulang)Bilangan lajur = Bilangan abjad dalam kunciBilangan baris = Bilangan abjad dalam teks biasa / bilangan abjad dalam kunci @ Bilangan baris =Bilangan abjad dalam teks sifer / bilangan abjad dalam kunci*genapkan bilangan baris kepada nombor besar.Teks biasa dibaca baris demi barisTeks sifer dibaca mengikut nombor urutan abjad dalam kunciLATIHAN: Columnnar Transposition: No Teks Biasa Kunci Teks sifer 1 HARI NI SAYA BANGUN LEWAT BUNGA NAUAEHIBNTIYGWRRANEOASALL 2 IKAN GAPI WARNA BIRU TUPAI NWBOGAIRAIALIARRKPNU 3 BERUSAHA TETAPKAN BERJAYA KASUT EHABYBATNARAPEASEAJOUTKRL 4 SPAGETI CARBONARA UDANG LEBIH PASU PTRADLHSEANUGIAIBRAELGCOA NBO 5 BAGAI AUR DENGAN TEBING KIPAS ADNNAUGBBANEGRAIIETG 6 MASA ITU SANGAT BERNILAI HIJAU AABLRMTGRIAUANLSSTIOINEAE 7 AMALKAN GAYA HIDUP SIHAT BAIK MAYDILAKAISTANAUHOLGHPAR 8 LANGKAWI PULAU BEBAS CUKAI ROTAN GPBCLKUEUOAWAAALALBKNIUSI 9 SINGAPURA PULAU TEMASIK UNTA GRLEIRIPPUALNUUTSOSAAAMK 10 RAJIN USAHA MESTI ADA HASIL SEMUT ASEDIJASALRUMASNAIAOIHTHL 11 TONER PRINTER CANON HABIS MESIN ORRNSENAAOTPEOIRTNBRNICHL 12 SERONOK BELAJAR KRIPTOGRAFI HUTAN OERTRSOARGNLKOIRBAPAEKJIR 13 KITA JOHAN MERENTAS DESA NEGERI HOBI THETEEIKJNESAEAARASGXIOMNDNR 14 BINA ANIMASI MUDAH GUNA SCRATCH KARTUN IMDACBIUNTNMUAZNAASHASHCXAIGRY 15 PERLIS STREET ART SUDAH BUKA LUKIS LRRAARTADKPSESBIETHWESTUU 16 MINECRAFT IALAH PERMAINAN VIDEO MASA IRIHMADEFLEIVOMCTARNINAAPANE 17 JUMPA DI PADANG KRIKET MAIN UDDKEMIARTJAAGKPPNI 18ANDA MENANG CABUTAN BERTUAH NASIB NNANUMGTRANUEHAECATDABBA Rail Fence Cipher / Zig Zag CipherKunci ialah suatu nomborBilangan baris = nombor kunciBilangan lajur = bilangan abjad dalam teks biasa @ teks siferTeks biasa ditulis mengikut corak zig zag seperti pagarTeks sifer ditulis secara melintang baris demi baris pada kotak yang ditandakan.LATIHAN :Rail Fence Cipher No Teks Biasa Kunci Teks sifer 1 KAMI AKAN BERJAYA NANTI 3 KABAAAIKNEJYNNIMARAT 2 RUMAH WIRA MENANG 4 RIAUWRNNMHAEGAM 3 JANGAN BAZIR DUIT 5 JZAAINBRTGNDIAU 4 MINGGU DEPAN HANTAR BUKU 3 MGPARUIGUEAHNABKNDNTU 5 JOM BELI AIR DI KOPERASI 4